I can overclock an intel i5-2500k manually to 5 Ghz. Computer posts, and loads OS but vcore is overvolting cpu over 1.5 v. Using the turbo evo with ASII latest version I can reach 5 Ghz with that, but it still over volts the vcore and it changes BCLK to 103. I called Asus tech support, and was asked why I upgraded to the latest Bios. I reverted the first bios, and it has the exact same bios options. It lacks quite a few settings in the Z68 Pro stickied, and most settings are disabled, enabled, auto. There isn't a vcore setting only an offset.
I love spending extra money for a kuhler h20 920 and can't get a OC higher than 4.5 Ghz. Every walkthrough on every over clocking forum I've been on all have options in the bios which mine doesn't. You would think boards in the same chipset series would have the same options. Tech support had no clue what I was talking about.