Today an article dedicated on overclocking the GeForce GTX 680. You will notice that if you go for long lifespan that overclocking the old fashioned way will not disappoint. A good 1300 MHz on the GPU is certainly something you can achieve quite easily with standard fan RPM. However with NVIDIA's new Dynamic Clock Adjustment technology things have changed a bit. Regardless of that you'll be able to tweak a lot more performance out of the card than you think.
Read the article here.