Got a 5960x last year at PAX, was the winner of the intel badge thingie. I can almost say it wasn't worth it, the financial burden to make a machine around it was spectacular at the least.
Anyway, running at 4.5 stable with a kraken x41. I dropped it down to 4.4 because it would at times crash, but I believe it to be a motherboard issue (x99 deluxe from asus) rather than the proc. These procs are unbelievable, but I'm thinking intel has gone a long way at getting their shit together, when I started with the one I got, the maximum overclocks on these puppies was all over the board. anywhere from 4.3 to 5.0.