I think that Nvidia drivers will let you registry keys inside Microsoft Registry who impede the proper use of a ATI card .
The same think like 3DFX did , ...if you remember it was very hard to hawe a NVidia card working fine if you had a Voodoo before .
I know a lot of people who bought Radeon 8500 and was unable to hawe a good functionality of the card without a fresh 0s reinstall if they had before a NV card .
Same thing happen if you use Norton Antivirus and Mcaffe in the same time ,...you will hawe registry keys erased .
I work with Norton utilities and if i try to use Fix-it 3.0 utilities together with Norton when i try to get rid of old registry keys (with Reg. cleaner) each one will erase the registry keys of another and you will end with a death program .
Allmost everybody i know who installed Radeon 8500 after a NV card hawe big problems with the card so i guess that this info i had is true .
P.S Please dont' consider this a flame ;...give only opinions if you hawe .
Thanx

------------------
-My P III 700E @ 1 GhZ RiG-
-SiSi/Sandra Bench.-