Well I learned/discovered something interesting today. The GTX570 in one of my Win XP PCs has been flaky for a while - if I power it on and reset it 5 or 6 times I might get video out, so decided to switch it out.
I don't have anything on hand of comparable power (annoyingly I had a pair of HD6950s I sold a few years back, one of these would have been perfect, and would have kept up with my all ATI/AMD lineup).
I have a GTX690 in my collection, so decided to add that. Put it in, went off to get the drivers..... no drivers available. There are drivers for the GTX680 so I gave them a try, but no luck. Looks like there are no WinXP drivers for the GTX690. I thought I was in the clear as I have in my mind that there are XP drivers right up to the GTX9xx series. Looks like I'll be on the lookout for an HD69xx or HD 78xx/79xx for this PC now.
I ended up putting in a HD4870 512MB as that was the best I had on hand, however benchmarks show that it's not significantly faster that the QX9650/HD3870 PC.
386sx25 SBP2 2M
P75(486) SB16 8M
P133 S3 Vir DX A64g 32M
P233MMX R128Pro A64 64M
Pii400 TNT2 Live! 128M
P3-1G V5 M80 256M
P3-1.4G R8500 A1 256M
A3200 9700Pro A2 512M
X6800 X850XT A2ZS 1G
E8600 X1950XTX A4pro 2G
QX9650 3870 Xfi 2G
i7-975 4870 Xfi 3GB