The original Test Drive Unlimited was great, but it rightfully bombed in reviews due to some really bad technical issues. Some of the car characteristics were really bad and off the mark, and the game suffered from an engine issue that was a problem other racing games had solved long ago;
On long slopes, the geometry of the road didn’t curve properly; the angle would have a polygonal jagging issue. This was most likely to shave off performance cost on the 360. Other games had already solved this issue by effectively smoothing angle changes, but TDU did not do anything of the sort. The result was that on hilly terrain cars would constantly bump around and lose traction due to weird unexpected air-time. Some cars were affected far worse than others, particularly super cars had a bad time.
I loved TDU, I loved cruising around in my Shelby Cobra and doing the one-hour tour around the island for decent money.
But the list of flaws is pretty long, and the technical issues made it a nonstarter for anything competitive.
I mean, for 10 bucks anything is a decent deal. Those specs are pretty decent for a simple home server. I’m not familiar with HP thin clients, but I assume you can install a Disdro of your choice on it? My big reason to avoid HP is their crap software and warranties, both of which are moot here.
I would say relatively light software like tailscale, pihole and such would be fine. Docker containers might be pushing it, but that depends largely on what containers you want to run, same goes for nginx; by itself the requirements are fairly low, it depends on what you want to run on it.
Jellyfin might be a stretch, and as you alluded to, real-time transcoding is probably out. It strongly depends on the decoding capabilities of that chip and wether it does hardware decoding or if it all happens in software. The latter might be too much for it. If it can handle it though, it might be interesting as a media player hooked up to a TV, rather than acting as a transcoding or DLNA-esque server.