i let the asus AI Suite utility overclock the CPU for me. i didn't even bother with the BIOS. it's just too much work these days. it was automatically overclocked from the 3.5 GHz stock speed to 4.9GHz on all cores. it tuned all the voltages too. has been rock solid since Augist 31st of last year, which was when the X99 platform and Haswell-E came out.
the best thing is that the CPU still throttles down all the way to 1GHz when I am not doing anything stressful, so it doesn't eat too much poer for no reason. but i should note that my CPU is water cooled.

Intel 5930K + Corsair H110
Asus X99 Deluxe
4 x 4GB G.Skill 3000MHz CL 15
2 x Asus GTX 980 STRIX
2 x Samsung 840 Pro 512GB SSD [RAID 0]
Super Flower Leadex 1000W Platinum
Phanteks Enthoo Primo