O.k., looks like you got some more help. I just checked my fps and I'm getting on the Hill400 scenerio 46-100fps. I do have AAx4. But thats all I know.
Did you have prior Intergrated GFX's that maybe was enabled when you took out your old card>You have to turn that off manualy.Your 430watt should support all of your needs just fine.Also what kind of mobo do you have.