Z68 Motherboard Roundup Part 2 @ OCC
 

On the Gigabyte Z68XP-UD4, I was able to achieve a maximum overclock of 4813MHz, which is the highest that I have been able to get my chip up to. The only other time that I had been able to get my 2600K to run at a 48x multiplier was when I had the base clock down around 98MHz, which still gave me around 3700MHz. I didn't have to raise the voltages going to the vCore on this board much higher than I did on the Sapphire board or any of the other boards I have tested, which just means that the power being given to the chip on the Gigabyte board is a little more clean and constant.

http://www.overclockersclub.com/revi..._gigabyte_z68/