OCC has published a review on the Asus Rampage II Extreme

Already knowing that I am limited by the stepping of my processor in its inability to hit 4GHz 24hr stable, I decided instead to opt for as quick and simple of an overclock as possible. I throttled the base clock to 180 and set the multiplier to 21 and left everything else on auto. The RIIE performed like a champ and set proper voltages throughout! That is completely amazing for someone looking to get into overclocking, since, as I showed before, you can just go in to the BIOS and see what settings the board is using to be stable and go on tweaking from there; what a great way for people to learn.

Asus Rampage II Extreme Review