I wish you the best of luck! The 3930K is, IMHO, a better overclocking processor than the 4930, as the avg 300MHz or so clock speed advantage negates the 3-7pct IPC improvement of the newer chip, but more importantly the 3930K is pretty darn near indestructible (a modicum of common sense required here, should go without saying). I got pretty lucky with my retail chip easily exceeding 5.25Ghz w DDR3-2560 9-12-10 for benching, and a hair under 4.9 for daily use with just 1.355v to be stable.
The only real sensitive area of the chip in regards to voltage is the IMC. Keep VTT1/VCCIO as low as possible/stable, and not to exceed 1.2v (I run 1.165v for both 24/7 for 4x4GB 2488 9-11-10-25), and unless you are running a custom loop I would try to stay under 1.375v (1.4-425v is the max "safe", and while I've gone above 1.5v there was little to no clock speed scaling at that point on chilled water... Peaks about 5.25 @ 1.415-1.425v).
The chips can get quite hot, and I would go so far as to say that the X79 chips are ideal candidates for custom loops, far more so than IVB/HW; with my daily clocks and volts, I've yet to exceed 56C except under synthetic loads. That's a solid 16-21C cooler than what I've seen on air.
Anyway, enjoy your awesome new setup, and if you have questions, don't hesitate to ask. Great community we got here