im useing 2 evga nvidia geforce 7950 GT's useing Ntune, the over clock option for O'cing the video card is disabled i tryed coolbits but no go. could they be locked? how can i tell if they are and is there a way to unlock them? thank you

Try using RivaTuner rather than Coolbits.

i just tryed RivaTuner. messed with the settings still wont unlock it. thank you for trying.

Another one to try is PowerStrip.

thank you that worked but my 3dmark score was lower then what it was befor overclocking it. i think i need a new PSU thank you for helping me