I'm really liking this board, currently working on 4.4ghz 21x210 having got 4.2Ghz stable:-
Click pics for more benches and bios settings.
1) 4.2Ghz 21x200 Ram x8 1600Mhz 7-7-7-19
I got my ram running at it's stock speed 2,000mhz but it needed an extra 0.3vtt from 1.28v to 1.58v to be stable:
2) 4.2Ghz 21x200 Ram x10 2,000 9-9-9-27