http://www.overclock.net/t/1265110/the-gtx-670-overclocking-master-guide Try this tutorial, it goes over EVERYTHING needed for GTX 670 overclocking, and takes into account that each chip is different. It be pretty much the same way you would do with the 680 here another guide http://www.thinkcomputers.org/nvidia-600-series-video-card-overclocking-guide/