I use the Coolbits registry hack. it adds a line in your registry to enable Nvidia's overclocking features. Although it dosent work with the 12.41 reference drivers.I have also used NvMax, Powerstrip,Nv Tweek. But the Coolbits is simple easy and effective. I got over 300 more points on 3DM2K1 by overclocking my card then tweeking the Display properties, VSync,FSAA. Page flip in Open GL,memory allocation ,etc..gave me even more.
I aint signing nothing!!!