This case is designed for PVR use; apparently some went out with BAD PSUs though. It makes very little noise because the PSU fan is on the inside, not the outside.

Anyway, it turns out heat is not my only problem. With the case open and the CPU running at a much more respectable 40-50 degrees, I still have freezes. I tried swapping CPU, RAM and video card (the only other card is the Hauppauge TV card), to no avail. I also disabling the on-board USB, serial and parallel controllers. So far nothing has helped.

I'm probably going to have to try a different motherboard, even though this Soyo was working fine. It has the advantage of having SPDIF audio I/O connectors, which none of my other mobos do.