Assalam o alaikum Here are my pc specification.asus p5gc mx 1333,core 2 duo e8400,3.5gb ddr2 667mhz ram,500 watt psu.now i want to buy graphics card.gtx 550ti or gtx 650.i want to know is my pc enough for these cards or there will be bottleneck problem?in this case i,ll buy gts 450 or gts 250.so suggest me gtx 550ti or gtx 650 and if there will be bottleneck gts 450 or gts250 or any other good choice.resolution 1280*1024.(i dont care card is dx10 or dx11.and plz dont suggest amd graphic cards)