Changing GFX Card while having OS X

[Ordaz]

So my ATI Radeon HD 4350 sh*t card doesn't cut it anymore. I want QE/CI on my Hac PC and I've killed it already 5 times for that. The point is, I'm thinking of moving to a faster, more compatible NVIDIA card (say, the GTS 250 1024MB using VGA display) . I'm currently dual-booting Mac OS X 10.6.7 and Windows 7 SP1. Upgrading my GFX Card with Windows won't be a problem. But what should I do for OS X? Should I install kexts or delete other kexts? I don't want to kill the computer again because I have a tonnage of downloads and updates installed already.