Hah that just reminded me of a problem I had with my voodoo3 back in the day. It would lock up on windows2k if ran in 640x480 for anything more than 30 seconds to a minute. This made installs of windows pretty much impossible, basically I had to install with another video card, download drivers, shut down and race with the lockup to get drivers installed before it locked. once I ran in a more normal 1024x768 res, it would be rock stable for weeks between power cycles. I never was able to figure out why it did that, many different win2k install discs were used over the years at different service pack levels.
A little off topic I know, though I guess it just reinforces the video card theory a little more...