I am looking for some upgrade advice, my system struggles a little with COD4. I currently have a 7950GT 256MB video card, Pentium D 830 CPU, 2 GB PC6400 RAM. To keep within my budget($300-400), I am thinking of upgrading to a 8800GT 256MB and a E4600 CPU. Would this be enough to smooth out the graphics on COD4? Thanks for any advice.