The forums here at Tom's have everything you need to overclock. You will as a rule need aftermarket cooling to overclock much and you are crazy not to overclock because doing so will make your i7 950 more powerful than the $1000 Extreme Edition chips but even at stock an i7 950 will not bottleneck SLI GTX480s. If you will start a new thread listing your exact parts ( motherboard, RAM, power supply ect. ) I am sure someone will get you started.
Thank you very much for the info. I never overclocked a CPU myself, so I will search the Internet for a instruction how to do it....thanks again.