OK i have a gateway that is running low on RAM (256mb left) and im planning on getting a stick of 1GB, but idk the right kind. Im very interested in the upcoming F.E.A.R. and COD2, and Brothers in Arms. My gateway only has a pentium4 2.8, and Im planning on getting the XFX SLi geforce 6800gs (is the xfx 6800gs a good choice of an upgrade?) and my cpu isnt good enough so i need some help on what cpu i should get, if amd then what mobo?