How do i run dragon age 2 better on nvidia cards?

I have an NVIDIA 465 and an AMD athlon x4 630 processor and am wondering whether the issues with the graphics in Dragon age 2 are hardware related. I'm unable to play the game with very high settings enabled, but I've read in forums of people with ATI 5700 series cards being able to. I have to run high with 4x AA just to get the framerate to stop being choppy. Any Advice?|||It could be related. You should really not be running dragon age 2 on nvidia cards. its crap