Putting a Threadripper in a homeserver is overkill.
Besides I wanted to replace the i7 920, so that it won't be that hot anymore in that room (130W TDP vs 65W). I think a threadripper would achieve the opposite.
Maybe I should just do seasonal CPUs... Threadripper in Winter and Ryzen in Summer.
If you still have the old motherboard you can buy an old Xeon X56xx and use it as a drop in replacement in the LGA1366 socket. An X5650 for instance cost about $25 on ebay, is clocked at 2.66 GHz like the i7 920, has six cores, a TDP of 95W, and overclocks really well. I don't know if most i7 motherboards support ECC, but the CPU supports it.
The LGA1366 motherboards still fetch some money too, if you'd rather sell it.
I would say get something a bit more beefy like i3 or i5, as most people will want to run some basic things like Game servers, database or maybe a plex server, and it's good to be able just to run things compared to either rebuilding or renting something in the cloud in a lot of instances.
Latest Gemini Lake is already past the level of Phenom 2/Core 2 but with 10W TDP. They are also faster than Broadwell i3 on the same frequency in single thread (but have no hyperthreading).
Besides I wanted to replace the i7 920, so that it won't be that hot anymore in that room (130W TDP vs 65W). I think a threadripper would achieve the opposite.
Maybe I should just do seasonal CPUs... Threadripper in Winter and Ryzen in Summer.