hi i am wondering why on msi afterburner or evga Precision whatever i put the slider to and hit apply nothing happens no fps difference in games no driver problems even when i put the core slider on msi afteburner to 845 and the memory to 1560 which is the max i can put it ? does this mean my gpu is impossible to overclock? or is it because it is already factory overclocked
my pc specs are
cpu intel core 2 duo e4400 @2.00ghz
mainboard foxconn 745 7mc series
memory 2 x1gb corsair ddr2 333mhz
graphics card Galaxy gtx 275 896mb overclocked
hard drives
western digital 160gb sata
western dital 160gb sata
seagate barracuda 500gb sata
samsung 120gb ide
dvd drive ide
dvd drive sata
antec psu
my pc specs are
cpu intel core 2 duo e4400 @2.00ghz
mainboard foxconn 745 7mc series
memory 2 x1gb corsair ddr2 333mhz
graphics card Galaxy gtx 275 896mb overclocked
hard drives
western digital 160gb sata
western dital 160gb sata
seagate barracuda 500gb sata
samsung 120gb ide
dvd drive ide
dvd drive sata
antec psu