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- cross-posted to:
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original post: https://mk.moth.zone/notes/a8zer7ypj6uv02ka
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All computers are single board computers if you take out their guts and tape them to a board
And they passively cool better that way much of the time too…
Technically a Pi is a single chip computer but they’re called an SBC because they replaced stuff like a Motorola 68HC11.
You’ll have no end of problems and won’t know whether it’s a hardware or software problem.
Damn straight. Another reason not to buy a pi.
Also, Raspberry Pi first got popular because of the size and cost. Now it’s popular because it’s popular. Not hating on them, I think they’re cool, but they’re not cheap any more. Especially with the scalping.
Getting x86_64 based systems is going to mean much less headache. Unless you truly truly need the size I wouldn’t consider getting a Pi or other SBC. Just go to literally any used marketplace (Facebook, Craigslist, etc) and get anything.
but they’re not cheap any more
People say this, but they really are still cheap.
The original Raspberry Pi Model B launched for £22 in 2012. The entry level Raspberry Pi 5 is £46, but adjusted for inflation that’s only £32 in 2012 money. So only £10 more expensive in real terms.
Raspberry Pi Zero 2 W is only £14.40, which is only £10 in 2012 money. Compare this to the original Raspberry Pi Model A, which launched for £16.
People look at the headline cost of the high end RPi 5s (£115 for the 16GB model, £76 for the 8GB), but fail to recognise that there was nothing comparable to these in the Raspberry Pi lineup before, and these are not the only models in the Raspberry Pi lineup now.
There was the supply shortage price spike, they really were stupid expensive then if you supported the hoarder/scalpers.
Since that has cleared… most of the Pi price increases (in inflation adjusted dollars) can be attributed to improved features like more RAM, or people acknowledging that having a good dedicated $20 power supply is preferable to dealing with the flakiness of that old phone charger you found under the bed.
Inflation adjustment doesn’t really tell the whole story though, it’s not like salaries have gone up by the same amount. Regardless, I don’t like dealing with the Zero unless I specifically need something that tiny. It’s just too annoying. Don’t get me wrong! They’re cool! I’m just saying unless I really need a Pi Zero I wouldn’t wanna work with one. I’d rather work with x86_64 than Arm. Like even just getting Java working was really tricky on Zero. Much like a microcontroller has limitations for what you can run on them but they have other benefits, Zeros aren’t really general purpose.
So yeah, dirt cheap used laptop for general purpose server beats out dirt cheap Pi in my book.
10£ more, or 50% more expensive?
Don’t like the expensive version? Get a Zero 2 W which outspecs the original by a wide margin.
Sure, but the specs aren’t directly comparable.
They also still manufacture the RPi 4, which starts at £33- which is £23 in 2012 money.
That’s only true for the high-end Pi 5. Lower-powered models like the zero 2 are still cheap, and they’re a lot easier to find than a few years ago.
Which part? Because the “it’s not x86” is even more annoying to deal with on Pi Zero lol.
Pi is popular with me because it’s time efficient. Meaning: when I am trying to get it to do something, it takes less of my time to make the thing actually happen on Pi hardware as compared with most of the other small / embedded alternatives. Notable recent exception: ESPHome on ESP32 hardware, but even there the more limited variation of Raspberry hardware makes it similar to those fruity phones, MP3 players and computers - since there are a limited number of variations, you can usually find information specific to EXACTLY your setup, instead of having to infer from something almost the same, but figure out little wrinkles here and there due to differences between what you are working with and what you are reading about on the internet.
A RPi is going to be smaller, quieter, and 10x more energy efficient though…
There are probably a dozen things you can do to save energy on orders of magnitude higher than using a pi.
Then do them. It’s still not going to decrease the energy use of your server.
Like: using the pi to manage your HVAC more efficiently.
Why use a pi instead of a microcontroller?
At the HVAC control level it would be a Pico - for the development / maintenance time efficiency: I know how the tools work, I know the community support is there, the hardware is easy to find and available relatively reliably, although ESPHome on the ESP micro-controllers is pretty good too.
Yeah… I’m not going to stick a clunky old laptop on top of my bookshelf and have it run 24/7 as my PiHole. My Pi Zero 2 W is far more appropriate.
No reason why a laptop wouldn’t work though.
I mean, a lot of things would work, I could power it all with potato batteries if I had enough. The Pi Zero 2 W only cost ~£15 anyway.
But… that’s so uncool…
I should have rebuilt an old coffee maker in to a Pi Hole instead. I’m such a rube.
I agree that the Zero is up to the task, but I prefer a wired connection for my home DNS/DHCP server and if I understand correctly the Pi5 has better wired ethernet than its predecessors… Yeah, utilization is laughable, but there’s something to be said for reduced lag time too:
Hostname: pihole CPU: 0.2% on 4 cores running 318 processes (0.3% used by FTL) RAM: 25.9% of 2.0 GB is used (7.4% used by FTL) Swap: 35.9% of 512.0 MB is used Kernel: Linux pihole 6.12.25+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.12.25-1+rpt1 (2025-04-30) aarch64 Uptime: a month (running since Sunday, May 18th 2025, 17:54:59I have never felt the need to have a wired connection for my DNS/DHCP, since such a trivial amount of data exchanges hands. The quality of the wired connection if it had one would similarly have negligible impact, surely.
For me it’s not about the bandwidth, it’s about the lag and reliability. I have had strong WiFi connections flake out a lot more than wired connections.
Also, I just prefer to not have 100+ WiFi devices kicking around my network when more than half of them could be wired, or on another protocol like Zigbee.
I guess I am pretty far from saturating my WiFi in any way, the removal of cables with little to no impact on connectivity was far more of a priority for me. I have never noticed a WiFi related outage or performance loss.
I will say this: we had a big lightning strike a few years back and it conducted into the house via the internet cable, then spread via the ethernet cables taking out everything that was wired (over $7K in damage) - devices connected only by power and WiFi were mostly spared.
I have one of those 8.1 laptops - I LITERALLY fished it out of a dumpster.
Where are these cheap e waste laptops with gpio and actually low power?
Digging through e-waste bins is one of my hobbies.
What kind of place do you go to to find these things? Sometimes I get really lucky (see my post history about my wonderful new printer), but if I could increase my odds that would be cool.
I’m just lucky enough to have one at my apartment building, and very wasteful neighbors.
Back when I lived in a (quite nice) apartment building I was constantly surprised at the things people threw out. Perfectly good furniture but also stuff like perfectly functional printers, artwork, computer cases…
If you go near college housing there’s usually a given day of the year (either moving day or an official cleanup day) when tons of people put out stuff they don’t want to bother with keeping/moving. It’s Hippie Christmas baby!
any luck with gpio and 5W power usage so far?
Worth noting pie 4 and 5 no longer recommend 5w PSU. And tend to fail if anything is drawing on the USB.
I think 5W probably can’t be achieved, maybe with chromebook-like hardware, but I guess GPIO could be solved with a USB accessory
in my opinion the bigger problem is the fire hazard of an unsupervised charger. I have seen enough that runs super hot, and even if it doesn’t, I just can’t trust them.
No, but I did get an Xbox that only needed a power cable.
Somebody already asked, but what are good locations to do this? Do you ever get harassed by property owners or law enforcement?
I’m in an apartment building, so I just browse the one here whenever I take the trash out. I don’t think anyone has noticed, or they’ve elected to mind their own business if they have.
There’s so much stuff that could still be used that it honestly isn’t funny, and that’s just in my own bin. How much more is being wasted across the country? But at least it’s in the recycling and not the trash, so that’s something, I guess.
No gpio but old centrino laptops make excellent low power servers. My primary server was a first gen centrino from 2011 up until recently and I think it only used 12w idle after putting a SSD in there. Had it’s own UPS built in.
The market is about to be flooded with them with Windows 10 going EoL in October.
About to be? The bottom has been falling out for desktops and laptops on processors not on Microsoft’s supported list for the last year or more. I’ve seen roughly the same system go from ~$200+ down to under $100 on the last year based on eBay pricing alone
There are usb gpio devices which can fulfill the connectivity bit. Pretty sure you are sol with the 5w though 😊
The Raspberry Pi Zero in USB gadget mode can be used for GPIO. If you don’t want to setup gadget mode, get Pi Zero W.
Power consumption is a massive reason to really not do that. Its cheap for a reason, its takes a shitload of power to be shit and you will pay more in energy than you save in hardware unless its only powered on for short periods of time - a server typically isn’t.
This is actually something that applies to cheap products too. Was in Asda a little while ago and saw 2 LED bulbs with the same lumen rating. Cheaper one used 3w more and you only saved £1. Running it for 8 hours a day for a year would cost double that saving in electricity. For a server you are looking at almost £2 per watt each year. Does that ewaste look so good to you now?
Some things are absolutely worth getting second hand, but you really should be careful considering the power cost as well.
Quick edit: If you don’t need it running 24/7, consider something like AWS too. I love selfhosting but if its not running much it might be cheaper to not bother buying hardware.
Aren’t laptops typically very energy efficient? Low consumption converts to high battery life, which is a priority for laptop hardware.
Some of them consume less than 10W.
This is generally not true. If you are using your laptop as a home server chances are it’s going to be idling 99% of the time and laptops are generally pretty good in terms of idle power draw if you manage to disable the screen (or just disconnect it, take it off and find a way to repurpose it)
And in terms of environmental impact saving a laptop from landfill is definitely better since the majority of a computers impact is from the co2 emmissions from the manufacturing process. And this isn’t taking into account the likely ethical considerations such as supporting terrible mining practices for resources like cobalt.
This is generally not true. A small server running on an old pi when idling will have hardly any draw. It will cost literally pennies to run for the whole year.
A rasperry pi idles at about 2 watts vs a laptop that idles at about 4 watts. At $0.30/kwh (a very high price for electricity) you would save 5 dollars per year on electricity. This laptop trades blows with the rasperry pi and costs half the price (55$ aud vs over 200$ aud for a brand new pi 5) Even this second hand one costs 110$ aud which is twice the cost. With that cost of electricity it would take 11 years in order to break even. And that’s only if you consider monetary cost and not environmental cost.
That’s not the point here. People probably do not need a pi 5. There are many other pi devices (and similar boards) with significantly less draw.
But I MUST CONSUME MORE ELECTRONICS
Are you living on a space station? What is this shitload of power? A whole 60 watts? Are you rationing AA batteries to run your household?
What is it with the bullshit fanciful rationalizations people come up with to consume consume consume?
Are you living on a space station? What is this shitload of power?
Some of us live off-grid and make every Watt-hour we consume. So it may be that one man’s fanciful bullshit is another man’s daily life. For context, this is my 2,461st day offgrid.
A whole 60 watts?
Over the last 30 days I’ve averaged 2.01kWh/day, or an average constant consumption of 84w. All in. And that’s on the high end for folks in similar use cases. In this scenario adding in another 60w would be significant (ie, impossible for my rig during winter months).
As Sesame Street taught showed us it’s a matter of perspective.
Um if you’re living with computers are you really „off the grid“ computers require the grid to be manufactured. If you’re off the grid because you worry about the way the worlds going and you think you’ll need to be off the grid to survive I wouldn’t make having access to computers part of the plan.
And that’s 60W while charging. In idle with the screen off, low end laptops often consume as little as 2-3W. Which is not far off from a pi.
But I want to be cool and awesome! I want to constantly re-learn how to do basic things over and over because TECHNOLOGY!!!
https://slashdot.org/comments.pl?sid=23718473&cid=65450499
And I think China is evil and dumb… but I click “add to cart” on aliexpress in my sleep!
But I am deeply worried about totally renewable energy consumption by buying an endless stream of disposable baubles!
(Read above in some kind of sarcastic tone)
60w is like £120 a year, these costs add up to the point that low spec servers pretty much always cost more in energy than hardware. Of course it also depends on where you live and your energy rates.
You could buy a 20 year old server that is going to use 800w, or you could buy a mini PC that is probably more powerful and uses like 10-20w.
Then again, I used to live somewhere that energy was included in the rent so short of starting a bitcoin farm usage wouldn’t really get noticed too much. In that case it would make sense to just go cheap hardware.
I’m glad I don’t have these addictions people seem to have. “I need a computer to measure how much water my toilet uses!” “I need a computer in my refrigerator!” etc
We’ve passed the useful stage of computing, we are now in the “personal issues” phase.
I’m not taking electronics advice from someone who uses the term lappies.
Where I’m from those were 10$ and legal in Quebec.
Yes actually still sounds good. Raspberry Pis actually have quite high power draw compared to the performance they give. Like sure the number might be smallish but the performance they give and functionality they have is awful compared to even a mini PC which use similar power. Mini PCs btw are actually one of the best options in performance per watt and can still be cheap, plus they have upgradable RAM and storage. A Mac mini is more expensive but will thrash everything else in efficiency and performance per watt, although non-upgradable. Even slightly older laptops will only draw tens of watts when fully charged, vs a desktop or proper server that could pull 100W even at idle in some cases. Older laptops tended to be more upgradable too.
Please be specific rather than referring to ‘raspberry pis’ together. Different models have way different characteristics.
Are any of them actually that good in efficiency though? Like a Pi 5 is probably the best in performance per watt, but it also has the highest power consumption. Realistically you wouldn’t self host on anything older than a Pi 4 anyway.
I can self host what I want on a pi zero. But, I do have some 30 years of experience so can probably do things some won’t understand / bother with.
Bro please. I understand you can host very small stuff on less powerful Pis. I used to host some stuff on a Raspberry Pi model b myself. Stop tooting your own horn. You couldn’t however host all the stuff I use or even most home labbers use on a Pi zero with modern software. I doubt it could run Jellyfin, an *arr stack, ollama, nextcloud, etc all at the same time. Probably you would also have to drop using containers which would be less secure and easy to deploy.
What’s the performance per watt of a Pi Zero anyway? I am sure it’s low power draw but I doubt it’s actually efficient.
See here’s the thing. Why would anyone want to host ALL the stuff on one pi? That is not what they were designed for. Ollama on a pi? Are you out of your mind? I’d run the biggest model I can on a modern gpu not some crappy old computer or pi…Right tool, right job. And why is dropping containers “less secure”? Do you mean “less cool”? Less easy to deploy? But you’re not deploying it, you’re installing it. You sound like a complete newb which is fine, but just take a step back from things and get some more experience. A pi is a tool for a purpose, not the end all. Using an old laptop is not going to save the world and arguing that it’s just better than a pi (or similar alternative) is just dumb. Use a laptop for all I care, I’m not the boss of you.
As for an arr stack, I’m really disappointed with the software and don’t use it and those who do have way too much time to set it up, and then make use of it!
A good “rule of thumb” to remember: if your electricity rates average (somewhere near) $0.11/kWh you can take the average power draw of a device in watts and that is equal to what it will cost to run that device 24-7 for 365 days.
So, if that cheap PC draws 50W more than an alternate solution, it’s costing you $50 more per year to use it.
Some tasks are beyond any RasPi, but it’s well worth evaluating if something like an N100 fanless mini-PC can handle it instead of loading up some Core i7 rig that’s going to cost more to run in the first year than the N100 costs to buy.
Your energy is clearly a lot cheaper than mine then.
Well, the idea scales, if your energy is 0.33 Euro per kWh take the watts x 3 and that’s your annual running cost.
Power consumption is a massive reason to really not do that. Its cheap for a reason, its takes a shitload of power to be shit and you will pay more in energy than you save in hardware unless its only powered on for short periods of time
Ewaste computers actually tend to be on par if not better than an RPi in power consumption these days. It might feel like a RPi should be more efficient given the size and USB power connector, but modern Pis consume a solid 10-20w while in use which is more or similar to most miniPCs (they idle at single digit watts now and can “race to sleep” more effectively than a Pi) while costing about the same and the Pi is far less upgradeable
That depends if the mini-PC is something in the Celeron / N100 family, or the Core i5/i7 family.
Should see an old 6th gen i5 mini PC on a power monitor. It’s basically nothing!
these shitty win8 laptops are surprisingly low power and efficient though.
lowendtalk, hella cheap vps with plenty of resources for most self hosted apps, the issue with it is usually storage space but there are ways around that connecting your drives from elsewhere
Warning tho, hella shills too but you could literally make a post asking if certain companies on the site that have active threads are scams and get valid responses that don’t get removed or anything so thats nice, like half of the ones I looked at were giving less resources than they claimed
There’s lots of ways to make existing hardware more efficient at the cost of performance. Under-volting the CPU and RAM (or just putting them in “efficiency” mode) can probably save more electricity than you lose in generational improvements. Considering how much more powerful PCs are compared to SBCs, you’d probably still have better performance than an SBC. Also, a more powerful CPU that takes double the power but as a result can idle for more than 50% of the time would be more efficient than a less powerful CPU never idling.
There’s a lot of other variables (like idle power draw, efficiency at various power levels, idle latency, etc), but in general I think your statement would be inaccurate at least 60% of the time.
Oh I am not saying specifically get a raspberry pi, personally looking at a bee-link N150 mini PC. It isn’t even that much more expensive than the 16GB raspberry pi and as its x86 I can just run normal debian installs in proxmox.
The post is talking about RPis and other SBCs. Mini PCs are in a whole different category.
Yeah, but this is about self hosting and it’s costs, so the comparison is relevant.
Yes it’s relevant. I have been one of the people making it. However they didn’t specificy what they were actually comparing in their first comment. So it ends up they are saying something false. Your average laptop could easily beat a raspberry pi in performance per watt.
Its all fun and games until the power bill arrives. Performance per watt is important, please look at that first. Don’t be me.
It’s not just the size constraint. The power usage is significant…
If you have the lid closed, you’re looking at 3 to 15 watts to have a laptop running in the background doing some basic server shit.
Maybe a little more under high load, but those are going to be intermittent and not constant.
I’m just saying it’s not that much more electricity usage, and the recycling more than offsets the CO2.
If you have the lid closed, you’re looking at 3 to 15 watts to have a laptop running in the background doing some basic server shit.
Not all laptops make effective use of power with the lid closed, sadly. Not saying this as a correction, but for others to know that they need to make sure these settings are available in the bios of the system they are buying.
Laptop performance when closed is quite variable, but depending on where you live, each 10W of idle consumption 24/7/365 could cost you somewhere around $20/yr (assumes @$0.20/kWh, YMMV). This isn’t overwhelming on it’s own, but it is “cost difference between a junked laptop and a Raspberry Pi” kinda money.
And you are often paying 140-200 for a pi nowadays to make it have the same usability as a laptop (pi, power supply, sata hat, data drive because SD cards simply fail after a while under server IO) while you can get cheap used laptops for 0-100.
So unless you are running it for more than half a decade (which rarely happens with selfhosters for a main server), you are probably spending more in total on the pi.
I think SD card failure rates are way overblown if you’re buying from reputable manufacturers (Sandisk, Samsung). I’m sure they do occasionally fail, but I’ve never experienced one.
You’re right, for really intensive tasks the costs can climb, but I see people asking for ideas for what to do with a junk laptop and the top suggestion is always something like pi-hole or a bookmark manager that could run on a potato.
Like with most things in life, it depends.
I used to think so too, but my pi-hole just died the other week after four years of uptime. Couldn’t work it out, finally pulled the SD card out to reinstall the OS and found my laptop wouldn’t recognise it.
Made me glad I don’t run my mailserver on a Pi anymore!
I join you, I used to change SD card and USB disk every 1-2 year. I bought a nas 3 year ago didn’t need to change disk yet.
I have a high fail rate with Samsung SD cards. Oddly the cheap-o no name ones haven’t failed yet.
Laptops are not generally designed to run like that with a closed lid. Heat dissipation is designed around the idea the laptop is open and some of it is through the keyboard surface. The lid closed would change that.
Systems can of course be setup to power off the display but for server/service uses open laptops may not be efficient space wise.
Having said that if the scenario is low power use the heat dissipation may not be a major issue. But if there is an unremovable battery i’d still be concerned about heat dissipation with the lid closed and even just the battery itself regardless of heat dissipiation.
Just remove the lid entirely.
really depends on the laptop. a lot of laptops exhaust off the side.
Not so sure about the last part. It takes ehhh about 3kg of c02 to produce 1 Watt for a year. Carbon footprint to build a laptop is about 200kg or so, but you’re not offsetting one of those you’re offsetting the raspberry PI you WOULD have bought which is just a small fraction of that. After a year or 2 you’ve almost certainly burned through your c02 savings if it’s on all the time.
A raspberry pi is not as efficient as people are claiming. They need up to 25W PSU for a reason. Laptops can idle lower than that certainly. Something like a MacBook Air M1 would idle in single digit territory, as would any netbook basically ever made. Only really high performance or older laptops have idle power draw issues since battery life is a major selling point of a laptop. Said laptop is probably also faster than a raspberry pi. The people building Pi clusters are really not doing themselves any favors with power efficiency.
Nah no way does the average ewaste tier laptop use less power than a raspberry pi for any given task. The power consumption floor for a laptop may be lower than the rpi ceiling but that’s not a fair comparison
Benchmark it and tell me. The truth is that most RPis are made using older process nodes to reduce costs. Laptops are often made using the best avaliable process node and core design. A modern raspberry pi 5 uses a 16nm processor with Cortex-A76 design from 2018. A laptop in 2015 would be using 14nm Broadwell processors from Intel. This was a time when 15W U series processors were gaining popularity, so sustained load power consumption is quite low. A 2015 laptop is 10 years old, and wouldn’t run Windows 11, so will be ewaste this year. Same with a lot of 8 year old machines actually.
Not quite. Unless the system has pretty advanced power management and is using very recent technology with high density, it’s unlikely that an x64 chipset will use less power than a comparably powered arm64 chipset. Not just the processor, but the smaller board is actually a power saver and allows it to generate less heat meaning both less power wasted and dissipated as heat as well as less power needed for fans to properly dissipate the heat. I’ve never seen a laptop use 3W at idle when considering the whole device, maybe just the CPU, but not if you include the rest of the components like RAM and disks and power supply. And especially true in a laptop that is old enough that it’s being recycled. Heck, the power supply and charger alone might be using 3W at idle with full battery.
With a raspberry pi 4, the typical power usage for the 2GB RAM model is 5W under load for the whole device and about half that for idle. Add a couple of watts for the extra memory and wider bus on the 8GB model and other things can add to that, but that’s mostly accurate. The pi 5 is a little more and the 3 is a little less. Of course, the efficiency of the laptop at full load might end up being better than a comparable number of raspberry pis it would take to do the same amount if work, but comparing a single pi or any other reputable arm-based, single board computer to a single laptop at idle is always going to be that way.
Battery charging circuits don’t operate continuously when the device is charged. Pi also still needs a PSU, typically a phone charger, and for a server application would need an SSD or HDD in most cases. SD cards have lower performance, write endurance, and capacity after all. A single raspberry pi couldn’t match even a somewhat old laptop in performance. In terms of actual efficiency (performance per watt) Pis don’t do that well as they are using cheap processors made using old core designs and even older process nodes. Even the latest Pi 5 uses a 16nm process node with a core design from 2018. A 10 year old laptop might have 14nm process node which would be better. This means that a laptop would have more performance, so even if it had more power consumption at peak it could still end up with significantly better performance per watt, and that extra performance allows it to idle more often as it spends less time processing requests.
Of course the ultimate in performance per watt is always going to be a modern high power server or an Apple Silicon device. Mini PCs can also do well for home use, and are much lower power so better suited to less demanding usage, and have the best performance per watt for consumer devices. The M4 Mac Mini for example is pretty much best in class in performance per watt, and low power consumption at the same time.
Battery circuits come on enough to be a load that needs to be considered and will show up if you measure load on the device vs load consumed by the components connected to the power supply. In terms of low power devices, it is significant, though not the primary concern. But compared to the pi PSU, the charger not to mention the battery and internal PSU of a laptop, consume way more power and produce way more heat.
All of the rest assumes needing always on, heavy load processing which isn’t what the post I replied to was talking about. I was specifically replying to idle power load. And in my case, even with a bunch of self hosted applications, most of the time my servers are idling. If I was running a virtualization farm or something that was always under heavy load, then yes, as I mentioned, a single board server isn’t ideal.
As for disks, I don’t use SSDs on my pis except one that actually does a lot of local data processing. Everything else runs in memory and stores persistent data on my NAS, including logging. Virtual memory/swap is disabled on all and things that need temporary storage/cache of small amounts of data is cached on RAM disks where applications can’t be configured to not use disk caching. The only need for the SD card is for boot and some minimal IO needed for local OS operation. I have a Raspberry Pi 3 B i got about 8 or 9 years or so ago with the same SD card in it.
They aren’t what I use as a database server, obviously, but they are extremely low power compared to what an old laptop would need and work great for things like pihole, and other network applications as well as being a part if my home kubernetes cluster and run the majority of the cluster’s processes on demand.
Fake news. Modern RPis need up to 25W PSU. Even old laptops could idle lower than that, as otherwise they wouldn’t be able to get significant battery life. Turning off the screen will also really lower their power consumption.
You’re comparing a laptop at idle to the power supply for a pi that needs to power it at full load plus overhead and inefficiencies. That’s like comparing apples to an orange tree.
I mean sure. If you want to compare actual efficiency then performance per watt is the metric. Here a laptop would easily win as it has higher performance for similar power. The TDP of a U class processor is only 15W normally. It would obviously help to disable things like Turbo Boost as well. Said laptop having more performance wouldn’t need to stay at high power states for as long as the Pi either as it takes less time to process requests. Returning back to idle faster is a big advantage.
Yeah… no. Old laptops idle at around 50 °C.
That just means they become 100% efficient in winter!
Idk, heat pumps have become a lot more popular in recent years.
my 20 year old pc runs at ~5°C above room temp under load
You really shouldn’t be spending your days in a room at 45 °C.
you are joking, but my room actually feels like that.
So do Raspberry Pi?
Get a slightly bigger heatsink.
Get them from where? I always read about these basically-free computers but have yet to see one
Sometimes you can find them on eBay.
I go to Ebay and sort by distance. It’s like Craigslist but they send it to you!
We have bins around our city for people to drop electronics off for recycling. I’ve taken a few laptops from there. You’re not supposed to, but ¯\_(ツ)_/¯.
One I gave to my buddy who needed something just for emails and web browsing and whatnot, one is running a server, and a couple more went back in to the bin because they were actually broken, but I took the hard drives for the server machine. I have one on a self ready in case the server machine dies so I haven’t gone looking for any new ones in a while.
I do e-scooter mechanical stuff, I always have a bid war with the local franchisee scooter shop nearby fighting for the scooters. I know its them, so I try to raise the bids for them as much as possible to fuck them around.
Facebook marketplace, kjiji, etc
Everyone here thinks their shit tier 2018 laptop is made of gold or something.
‘Gaming laptop, only used occasionally. Been sitting around for a while because my kid’s got a new hobby. £1,200 no offers. I know what I’ve got’
The pictured laptop has a Centrino sticker on it and looks like it’s been used to dig a garden
Yep. My FB Marketplace is 75% crackheads flogging off stuff they stole from shops/actual tax payers/their neighbours/ the train, 10% delusional idiots with shit that isn’t worth half of their asking price, 10% scammers, and 5% not shit listings.
Same here in México, a lot of people think their dual core Intel from 2011 (and even older than that) is still worth more than +$100USD. Even worse, companies usually want to resell devices to recover some of the cost, so even that option is kind of expensive. I’m waiting for some friends that can buy company devices for cheap so they can resell them to me for cheap too lol
Pawn shop I would say but they are expensive too… Their is some carricatibe structure which refurbish computers and sell them gor dirt cheap. 20 Buck per tower. But that crapy computers.
Did someone fall asleep on the keyboard when they came up with kjiji?
I think it’s secretly Khajiit’s new marketplace for wares if you have the coin
I wouldn’t touch Facebook with a 10’ ethernet cable. Haven’t heard of kjiji, I’ll have to check it out.
You’re missing out, Facebook marketplace is THE place to buy local secondhand goods for dirt cheap without getting scammed. You do need an account but you don’t need to install anything, and the payments are not done through FB
Haven’t heard of kjiji, I’ll have to check it out.
It’s essentially Craigslist, but in Canada.
Craigslist doesn’t really have a user base here.
Except in Vancouver. It’s a Craigslist city.
Interesting… I wonder why?
I know its not the most ideal place, but FB marketplace where I live has lots of old PCs/Laptops for under 50 eur. I would probably start there personally.
eBay, work, friends/family, friendly ask of your work’s IT person, or just call up the local recycling/ecycling company and ask
It’s a good idea until you consider the fact that a Raspberry Pi will be astronomically more power efficient.
If you think in flops per watt, maybe a little bit, but not a lot. Do you have one or two good procs for almost free, or half a dozen new sbcs at $100 each? Takes a while to save back that amount in power.
My question is usually not how many flops, but how quickly and reliably those watts can give me just a few flops on demand.
Alternative. Cheap android box and coreelec.
You can have them for about 20 bucks. Have minimal power consumption. And small power factor. They also have ARM architecture.
They are good for low power applications.
I dislike posts like this. Technology moves quickly. PIs are great for hobby electronics where you need a little computer. Want a cheap computer to run a few things 24/7 and know what you’re doing? Pi it is. You don’t need to run containers on a pi because you have the skills to install the dependencies manually. They cost pennies to run 24/7.
I think of pis as beefed-up calculators. I have made lots of money using a pi zero running code I needed to run 24/7. Code I developed myself.
Having an old laptop with outdated parts taking up lots of space, weighing a lot, and having components like fans, keyboard, and mousepad most-likely soon dying and needing replacing is an additional concern you don’t want.
Someone below saying use an old laptop if you’re living with parents and don’t pay the electricity bill is a bit lame. Do your part for the world. Someone will be paying for it.
Ultimately, use what you want but if you’re just starting with servers, use a virtual machine and log in to it. You can dick about with it as much as you want, and reset back to a working state it in seconds.
I think this really depends on the model they’re eyeballing because the Pi5 is frankly ridiculous for the price and has absurd power requirements (5V5A USB?). I wouldn’t recommend one of these unless you have a specific need like a certain hat or the GPIO pins. You can get a Dell micro Optiplex for less money and have a full fledged i5 or i7 processor with similar power usage.
Plus the RPi Foundation exposed themselves as the greedy bastards they are during COVID which is yet another reason to turn your back on them.
For something like a Pi Zero, maybe go for it, but there are similar devices out there from other companies too.
I picked up a used 2018 Fujitsu office PC with an i5-7500 for $60 (from a physical recycle shop, with a 14 day warranty) and it draws 15W idle. Way better value than a Pi (once you’ve added case, cooling, PSU etc) for running home server stuff.
A Pi still kills for “Arduino plus plus” use cases where you need the size, GPIO or can optimize the heck out of power usage on a battery.
It’s even worth pointing out you can disable various parts of the pi so it uses / needs even less juice.
You can get a Dell micro Optiplex for less money and have a full fledged i5 or i7 processor with similar power usage.
Absolutely, I’ve got a cluster of mini PCs with 7th/8th gen T sku i7s, plus an Optiplex SFF running a standard i7-7700, and everything together draws less than 100W on average.
Pi’s are ARM-based, which still to this day limits the scope of their applicability.
Also, you should absolutely inspect a laptop before buying. Many, if not most, of old laptops will run just fine for the next few years.
Pi’s are ARM-based, which still to this day limits the scope of their applicability.
Untrue.
Also, you should absolutely inspect a laptop before buying. Many, if not most, of old laptops will run just fine for the next few years.
Until the battery needs replacing, costing more than a pi, one key on the keyboard dies, etc.
Yeah, theres a lot of old old laptops which make no sense to run. But there’s a growing crop of more recent used devices that are only being sold off because they don’t support Windows 11, and the power efficiency story changes there. The OOP mentions “8.1 lappies”; my main laptop has a 15W 8th gen which is only in the last year starting to feel less appropriate for desktop use. (And honestly, a RAM and storage bump will probably get me another couple years.)
For environmental concerns, youve got to tax new devices with manufacturing costs as well.
100% agree about VMs though.
Laptops don’t even use that much power. You guys are really not into home labbing or as good with tech as you think you are lol. Lots of people run older real servers and desktops as home servers. They use way more power than laptops. Raspberry Pis sound good but use progressively more power in each generation, and still struggle to compete with mini PCs and even older laptops in performance. They also never had good performance per watt. In performance per watt basically nothing beats a Mac Mini, though other mini PCs are also good. Laptops aren’t bad in energy efficiency either. They are literally designed to run on battery so have as little idle draw as possible. They would be comparable to a mini PC if you turn off the display.
Edit: Modern RPis apparently use 25W, which is firmly in the territory of what a laptop would use when not running the screen or charging the battery.
Jesus 25W is about what a miniPC would consume at a constant 30-50% load!
Rpi uses 25watts? My old acer 6th gen laptop has a 15watt TDP and remains around 8watts 24/7 even with my services and without disconnecting the internals. My 8th gen laptop pulls 6watts with the screen on. People here saying older laptops arent a good choice are insane considering the ~$100-300 diffrence between an ewaste laptop and dedicated minipc + backup power bank (laptops have internal batterys you can easily replace when they go bad)
yeah even the best overheating overpowered gaming laptops have way lower power draw compared to your average desktop? It’s really not that high or crazy to use an old laptop instead of buying a pi lol.
