I have been working on overclocking my 4930K. Here are my results and comments. I have owned the 3930K also.
The Ivy Bridge memory controller is much better than Sandy Bridge. Running Gskill 32GB at 2400Mhz @ 10-12-12-31 timing. Memory controller voltage set at 1.3V. Possible I can go lower.
I hit a wall past 4.6Ghz Core. 4.7Ghz requires 1.5V+ and I could not achieve stability.
4.6Ghz core is completely stabile at 1.42 Core(In Bios). Currently running at 4.6Ghz
Temps are much better than Sandy also. In my Rig and at the same Vcore on both Sandy and Ivy, Ivy is 10 degrees C cooler.
I believe the core temps will drop slightly more in a few days after the Gelid GC Extreme TIM settles in.
4930K_4.6Ghz.png 169k .png file
Edited by Cool Mike - 9/13/13 at 10:13am