It isn't too hard, you can look up guides on these forums on how to overclock a graphics card. For this card, make sure you have the latest drivers and download MSI Afterburner. From there, make a custom fan profile to increase fan speed more steadily as the core temperature rises (I use the one from the GTX 670 Overclocking Master Guide
). Scroll down to the Maximum Performance profile. Download and run benchmarks such as Furmark and 3D Mark 06 Then from there, increase the core clock (I suggest keeping the core and shader clocks linked until you get the hang of overclocking) until the NVIDIA driver crashes, an error occurs, or artifacts (graphical errors, such as incorrect textures) appear. Then once you find the maximum core clock that the card can handle with stability, increase the memory clock and look for the same signs of instability. Once you get both of these clocks to their maximum stable speed then you will have a basic overclock on your graphics card (more complex overclocks involve increasing voltage, but this is limited to a few cards in which voltage control and monitoring are allowed).
Edit: Remember to increase these clocks in small increments such as 5-15MHz.Edited by Diablosbud - 7/12/13 at 8:27pm