We are using the excellent Gigabyte Z77X-UD5H motherboard which we reviewed last week.
The Gigabyte board set the memory up in compatibility mode, configuring the speed to 1333mhz.
The memory has two XMP profiles. Profile 1 for 2,133mhz operation and Profile 2 as a fall back 1866mhz mode.
We checked the timings to ensure everything was in order. It was configured correctly at 11-11-11-30.
To overclock, we manually tried to select a 2,400mhz profile and loosened the timings. Sadly the system wouldn't post. We therefore opted to increase the system base clock, after selecting a 22x memory multipler for a basic 2200mhz speed.
We achieved a final overclocked result of 2310mhz, from the default 2133mhz.
We had to loosen the timings further (11-13-13-36) however to get stability.
System validation at 2310mhz is available here.