I previously had a 9500GT, so it's a relatively small upgrade, but I got it as some games were crashing/bluescreening, and giving a graphics card/driver related error. When I tried rolling back the drivers, and then reinstalling older & newer versions to no avail, I figured the next logical step was new stuff!

I have to say, I was suitably impressed, Ubuntu loaded up, picked up my dual screen* setup perfectly, and it was as though nothing had ever changed. Brilliant...now for Windows 7! I foolishly expected minimum fuss, as it had been good to me when I installed it all those many moons ago, only to boot it twice since then. How wrong I was. 800x600 single screen until I downloaded and installed the drivers, and rebooted.

I think we'll give the point to Ubuntu then!
* About 30 minutes after installing the new graphics card, I'd purchased a new 24" screen online, to replace my current 2x20" setup. I need more desk space!