Your pc will support any gpu.i suggest to get hd 6570 or hd 6670 instead of gt 630 as they are faster than gt 630.2gb gpu is waste of money get 1gb hd 6570 or 6670 as they are able to handle games at med-high settings upto 1280*720 resolution.
Alright... I have Asus P5G41T-M LX will hd 6670 work on this ?? And does it require extra power ?