Duren,
According to the Sapphire website, the Theatrix supports W2K, and XP.
http://www.sapphiretech.com/awards/image/media_251.pdf
However, according to ATI's page, it's only XP and MCE. I dunno for certain, until I can test it. If anything, this is a lesson in not taking anything at face value. Moreover, one person's experience hasn't always been the same as another person's where this card is concerned. I'm gonna give it the ol' college try.
Which brings me to my announcement that I've bitten the bullet and purchased a Theatrix just for yuks (did I sell out or what?
). I've got W2K Service pack 4 installed, and I'll test it out for myself and see what further I can contribute to the effort by my tinkering.
-Erik.