Graphics Cards

I have a BFG Tech Geforce FX 5500 graphics cards in my PC with 1.5g of ddram with a Athlon 64 3200 processor. I was informed that my processor on my graphics card sucks and would like to know if anyone could recommend a card that I would have less problems with such as game performace for my PC that would not be rather pricy? Or if there are any alternatives that would stop lag in the game because it is not only in my DOOM 3 but also Medal Of Honor Pacific Assualt and a few other games.

Apparently the Geforce 6600GT (not the regular 6600) eats Doom 3 for breakfast. It's not too expensive, and as far as I can see there's not all that much of a price difference between the 256 MB and the 128 MB version.

I have a geforce nvidia 6800 gt 256. Yeah that works pretty good heh.