Can anyone help me??!! Iwant to upgrade from gf 4400ti to gf 6800(non ultra or gt) mainly for Doom3. My setup is Athlon 2400+,512mb ddr, ECS K7S5A mobo 300w psu. The mobo is only 4x agp and the 6800 is 8x agp. Would this incurr a serious drop in quality/performance/fps or would it not be that noticeable? I am upgrading my psu also. Any suggestions?