I need a cheap backup video card for backup as I'm doing critical work (not at all video intensive) and I can't take a chance on being without my machine. I've been using what was my backup since my primary video card failed a couple of months ago (7600GS, 8X AGP, passive cooling). Now, if my backup card fails I'd be in deep do-do. There's no way I'd be able to find a legacy AGP card locally.

Interestingly, even though my backup (Radeon 9600SE) is significantly less capable than the 7600GS, it does just fine for my needs.

There's a good selection of inexpensive passive 9600XT AGP cards on eBay for the MAC G5. Would those work on a WinXP machine? I built my PC to be super low noise, thus the passively cooled cards. I plan to build a new low-noise Linux machine this summer with modern components.