I tried just to get to desktop at 5GHz and failed, but I'm forgetting this is only an Evga motherboard and 525MHz fsb is kinda pushing things lol.

I did however manage to boot at 4.75GHz:



I'm very happy at the moment with 4GHz on 1.25v but I'd like to aim to aim for a higher clock speed - 4.5GHz is easy for the CPU but I'm not sure how the FSB will hold up...