A few weeks ago I set out on the task of making myself a HTPC, but I wanted something special, so I shoved a whole computer inside of an original xbox case.
Graphics card never reaches 65c~ under load.
Processor almost never reaches 70c~ under load.
I was really worried the small FlexATX power supply would sound like a jet as its basically a server power supply, but the fan is completely silent, even under load. I had to check that the fan was working as I was getting worried but all is good! :)
Fans are audible in a quiet room but any noise will drown them out (like from a TV). Side fan is set to silent, I don't think I needed to use it with the middle cut out and meshed.
Runs Windows 10 Enterprise with a custom shell that boots into Kodi for TV, Movies, Music, etc. Has the option to launch BigBox which is an awesome emulation frontend that I highly recommend, it can run anything up to and including Wii U games (Although that emulator is still in development!).
Full album of photos can be found here: https://imgur.com/a/V3G2j
Good, cheap ram.
Really quiet, really small, pretty powerful.
Small, quiet, efficient.