I had lots of problems with P6 and my ATI card, enough that I almost shelved the card. Then someone suggested I use the Omega drivers instead of the native drivers and wow! It completely fixed any P6 issues I was having (and gave me some serious FPS in this online game I am playing to boot)

Anyway, it's worth a try. Get the Omega drivers from www.omegadrivers.net

JDexter