I'm in the process of getting my Home Assistant environment up and running, and decided to run a test: it turns out that my gaming PC (custom 5800X3D/7900XTX build) uses more power just sitting idle, than both of my storage freezers combined.
Background: In addition to some other things, I bought two "Eightree" brand Zigbee-compatible plugs to see how they fare. One is monitoring the power usage of both freezers on a power strip (don't worry, it's a heavy duty strip meant for this), and the other is measuring the usage of my entire desktop setup (including monitors and the HA server itself, a Lenovo M710q).
After monitoring these for a couple days, I decided that I will shut off my PC unless I'm actively using it. It's not a server, but it does have WOL capability, so if I absolutely need to get into it remotely, it won't be an issue.
Pretty fascinating stuff, and now my wife is completely on board as well; she wants to put a plug on her iMac to see what it draws, as she uses it to hold her cross-stitch files and other things.
I haven't really run into that recently... Though I imagine pretty much any x86 system made in the last 20 years or so should handle it fine. I remember getting to that point on my old PIII-powered Optiplex GX1, that was a fun time. Trying to build nukes, an army of assault kbots/vehicles, bombers, and construction bots, and trying to guide what remains of your previous armada to where you think the enemy is because they took out your long range radar units...
I do have the CDs in storage somewhere, too, I should dig those out and see if they play nice.