What happens is, I check that box to allow overclocking, and that prompt comes up asking whether you want to detect stock clocks now or reboot to detect stock clocks. Regardless which option I choose- I still cannot OC my cards. If I click "Detect Now"... the dialog goes away and then nothing happens. If I click "Reboot" my comp will restart but when Windows comes back up, the OC'ing option in RivaTuner is still greyed out.
Any ideas why this might be happening?