I have been building systems longer than most people on this board have been alive. I made my share of mistakes years and years ago and freely admit it when I do.
I used to LOVE Asus motherboards but, over the past several years their rise to greatness has been followed by a huge decrease in their quality.
I had an Asus Rampage II Extreme that developed a USB problem after 6 weeks - it would no longer recognize either the keyboard OR the mouse. As it turns out, this was a known issue with this board and it was replaced. 6 months later the on board sound went dead - nothing - nada. Rather than tear the system apart - AGAIN - I simply picked up a decent (better than the one on the mobo) USB based Creative Labs sound card.
Then I tried the Rampage III Extreme. This one has an issue where it only boots periodically - when it doesn't boot I have to push the Q_Reset button on the motherboard (the one that interrupts power to the CPU itself) repeatedly until it boots. This is using a Corsair Digital Power Supply (the best made). The same thing happened with their replacement board. I went on Tom's hardware and a few other places and NO ONE had anything to add (at least not that I had not already tried). A few months later someone else asked me how I fixed it because they had the same problem. Fortunately, this system is one that I do not reboot often as it is used for my business headquarters software - this means that if I reboot it every 3 or 4 months well, that's it. At some point I'll rebuild the system and just toss the ASUS piece of junk in the trash or sell it... maybe I'll try to get one more new one from ASUS before I sell it so I can say I'm selling a fresh one from ASUS - who knows. But, this is the LAST Asus board in my plans.
I have since picked up an ASRock Extreme11, which has been ROCK SOLID with the 3930k and 32 gigs of Corsair ram (1600OC).
Asus - it was a great ride while it lasted but you had 3 bad mobo's in a row and that's just TOO much...