Using bclk to oc because multipliers are locked. Cooling is Thermaltake Water 2.0 Pro. USB starts crapping out above 105 bclk for me. Stuff like keyboard/mouse/joystick are still ok, but storage gets sketchy.
Coming from an unlocked 6-core though I'm not sure a locked Xeon will be a big upgrade for you. The best Xeons for workstation use on X79 are actually the E5-16xx V2 series which are unlocked. The E5-1680 v2 is a fully unlocked 8-core Ivy EP.
Main reason I went with the E5-2690 is that it was available for cheap on Ebay. I paid just $165 including shipping.