I been trying to overclock my Graphic card through RivaTuner but it wont let me, every time I increase the core clock and memory clock and click on apply they go back to default, I also tried Ntune, it wont let me even drag the arrow thingies to the right, its just stuck there.
I have a GeForce 8800 GTS 512
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More aboutoverclocking rivatuner
Depending on the brand some lock there cards bios to not allow overclocking. Try useing EVGA precision i like it better then rivatuner and its easier to use. Also make sure u have the newest drivers and the newest version of rivatuner.