hi , just wanted to know if there was a way of getting my card to o/c , just done my cpu from 1.8ghz to 2.8ghz but my graphics are still slow and juttery ,have installed riva and 3dmark vantage but my benchmark is crap is there any way to balance my core ( @690mhz ) shader ( 918mhz )and mem (313mhz )without m syste crashing