I currently have the Nvidia GeForce 4600 ti AGP(128mb DDR). The computer is a Dell Dimension 8200 with a Pentium 4 processor @ 2.2GHz w/512 K l2 Cache. I am maxed out on RAM with 2Gb. I recently bought Ghost Recon Advanced Warfighter and found that it won't work. The Video cards recommended are the GeForce 6/7 families. Will one of the Nvidia 6800 series cards work? Am I stuck with cards that have only 128mb of DDR?