hi ...i hv nvidia geforce 210 ...and i m planning to buy a new graphic card nvidia 250gts 1gb ddr3 .......do i need to buy a seperate power supply?...or it will consume d same kinda voltage....i knw dis is a v.funny ques ..bt plz guyz..i dun hv ane knwldge about dese things....and m gonna use dat card on winxp 64bit...is it okay??..cz games run wid better performance on xp rather dan win 7...plz help me..