Yes, you can easily do it.

You want to look at 2 things: 1. Noise 2. Ratio of performance / power usage.

1. Noise

When your PC runs 24/7 then it might be annoying to hear it’s noise sometimes. Real server cases are usually even much louder than former PC’s because they are built for super strong air flow inside.

Think carefully what you need. In my situation it is just one light wooden door away from my bed, so I wanted it impossible to hear. I optimized it so, and it ended up being so quiet that I cannot hear any fans, but I hear the clicking of the harddisks all the time. Well, I got used to that, mostly. For my next home server I want to build my own case that absolutely blocks this noise.

2. Ratio of performance / power usage

People are frequently asking what if I turn this old Pentium etc. into a server?

Well, these old CPU’s have very low performance compared to new ones, but it might just be sufficient. But then you recognize that the old veterans burn 100 Watts for the same performance where a modern (low performance) CPU burns only 5 Watts, and now it will do that 24/7. Think about your yearly costs. Many times it turns out that buying a new one saves your money very easily.

I bought a used m920q for this reason, still working on it, I’m at the docker-compose phase

I have two servers/mini lab / whatever you want to call em. Ones running unraid and is my main server Frankensteined from an old mini itx mobo off of ebay with an Intel quicksync capable cpu. And the others a $80 Lenovo m93p that I just installed Ubuntu server + casa os to mess around with it.

Its less of a need for powerful hardware and more of a want.

I started off my days with a laptop that had a broken screen. I took screen off and hid it behind my desk, worked perfectly fine, even came with a built in backup battery too xD

When talking about hardware, the physical computer itself, a “server” is commercial grade and designed to run under heavy loads for years on end with very high reliability. Error correcting RAM, redundant power supplies, room inside for huge processors, more airflow than a C-130 for cooling, etc.

On the software side, a “server” is just a computer that provides some service to users on a network. You very likely have one of those Wi-Fi router/ethernet switch things from the likes of Linksys or whatever, right? That is almost certainly acting as a DHCP server for you LAN, in that capacity it might handle kilobytes of data a day because dynamically assigning IP addresses on a household Wi-Fi network is not a very demanding task, so it’ll do it on a tiny little ARM processor with a few MB of RAM. It probably also has a web server, which is how the “go to its IP address in your browser and get to your router settings page” works. It’s serving a little website that most of the time gets absolutely zero traffic.

So, turning a desktop PC into a “server.” The question is, what services will it provide? Desktop PCs are pretty good at mostly low traffic with bursts of intense work, so if they’re going to sit still doing nothing while you’re at work all day, and then maybe handle some file storage or media transcoding during the evenings while you’re home, a PC will do that just fine, if you’re okay paying the power bill of having a computer up and running all the time.

If you’re hosting a website or a game server with a lot of active users around the clock, you might want to look into more professional hardware.

My answer would basically be yes, but. An old desktop (or even laptop) can definitely be used and will run fine. It should be very easy to get one for free or very cheap as companies will typically write them off after 3-5 years.

However, you might want to consider power consumption. Running a desktop 24/7 will use a lot more power than a new MiniPC or a NUC, so you may want to calculate how much it’ll cost to run a desktop 24/7 compared to a device that only uses 5W or whatever, and see whether the upfront savings make up for what you’ll pay in electricity over a certain period.

I think you might actually want to look into second hand MiniPCs unless you absolutely need to fit a bunch of hard drives in a case (like you probably would with Jellyfin).

Also I want to echo what others are saying about noise. A desktop or rack mounted server will make more noise than a laptop or MiniPC.

Any normal computer can become a “server”, its all based on the software.
Most enterprise server hardware is expensive because its designed around demanding workloads where uptime and redundancy is important. For a goober wanting to start a Minecraft and Jellyfin server, any old PC will work.
For home labbers office PC’s is the best way to do it. I have two machines right now that are repurposed office machines. They usually work well as office machines generally focus on having a decent CPU and plenty of memory without wasting money on a high end GPU, and can be had used for very cheap (or even free if you make friends that work in IT). And unless you’re running a lot of game servers or want a 4k streaming box, even a mediocre PC from 2012 is powerful enough to do a lot of stuff on.

It is a fantastic idea to start your home server project on some e-waste hardware, and use it until you know specifically what features you’re lacking that you would need better hardware for.

I’ll tell you a secret: my cool looking 4u server case with 8 hot swappable drive bays actually just houses my last gaming rig. Know what’s going in there when I update my current rig?

This rig.

Heck yeah. Not always the best for power efficiency though.

Old laptops also a great choice but I really recommend removing the battery first.

You could ask the question for video gaming. Can a used computer do the job? Yes, but you may not be able to play cutting edge / demanding games if your computer lacks the appropriate hardware. It really depends what kind of things you want to do, for choosing hardware that’s powerful enough.

Jellyfin? You need to consider if you need transcoding. Transcode or not makes quite a difference on the hardware needs.

I love the vibe in this thread/community. You all seem like real cool cats. I appreciate that.

My current home server that runs three dozen containers including Plex and Emby as well as two dozen other services and many terabytes of data is literally an old Lenovo desktop I got for free out of somebody’s garage 14 years ago. So yeah it’s sort of a perfectly fine place to start.

Yea definitely. I started tinkering with my first server in 2020 and used an ewaste dell tower with an i7 3770 (8 years old at that point) and an old rx460 I had laying around. As others mentioned power consumption was way worse than modern hardware. But I had at one point a half dozen people streaming jellyfin 1080 content from it with no hiccups at all. That said I was running on linux, not sure how it would do if you run windows.

Right now I’m using a low power pc to run my server, again an old ewaste dell micro pc with a 5th or 6th gen i5 and no dedicated gpu. Still no problem streaming to my partners and I’s phone/tablet simultaneously. Again, running linux.

I started with my old gaming rig as a server, any decent intel cpu with quicksync is very good for plex and transcoding saving having to buy a cpu if you went with like a server grade cpu with no igpu