It looks as if nTune, the NVIDIA utility for maximizing and optimizing performance with your NVIDIA GPUs and motherboards, is coming to Linux. The nTune Linux utility likely won't arrive for at least a few more months, but it's apparently in the pipe. Here is more information on nTune for Windows. The system utility supports GPU overclocking and temperature monitoring along with motherboard/CPU/memory overclocking and temperature monitoring,

I am so glad I got rid of my ATI card last month. Drivers actually work, performance is close to on par with windows. Nice job NVIDIA - not sure why I ever left for ATI as they have always been leading the industry