http://valid.x86-secret.com/show_oc.php?id=405457



Board can't go over 289 at the BIOS. However, this 3.45 Ghz is pretty solid, voltage is 1.475 at BIOS, but with Asus vdrop is around 1.45.
Interesting is that the cheap M3N78 Pro are much better and more stable than fancy Crosshair 2 formula. Also M3N78 Pro allows only to change memory speed, voltage, nb speed, core voltage, nb voltage, etc... but you have no control over the memory timings!