Which Is Better In GT 640 And GT 730(Both GDDR5 And Zotac And Of Same VRAM)All Specs Of Both Are Same Except Base Clock Speed In 640 Is 150Mhz More Than 730,But I Heard Lowest Requirement Of FC4 Is GT 730 So Which Is Better....I'll Be Playing At 768p,i3 3220,6gb ddr3 1333Mhz ram,and one of 2 cards