In one simple step you can get some great overclock performance.
Great article here on Tom's
Here is the key paragraph in the conclusion:
In the case of the Core i7 920, the best setting was 3.66 GHz—at this level, the CPU delivered a massive performance boost when compared to the 2.66 GHz stock speed, while still not introducing excessive power consumption. We found that the 3.33 GHz setting makes even more sense for average users, as virtually any X58 platform for Core i7 allows the user to easily overclock the Core i7 920 from 2.66 to 3.33 GHz by increasing the system clock speed from 133 MHz to 166 MHz. You can even keep the Core i7 Turbo Mode, which accelerates an individual core by up to two multiplier increments at peak single thread load.
I did the 3.33GHz setting on mine and in turbo it hits 3.6 when under load.
Runs cool and smooth