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For testing today we are using the excellent ASRock Fatal1ty X79 Champion motherboard which features a comprehensive UEFI interface. This has all the options we could possibly ask for for overclocking. We updated the BIOS to the latest version before testing.
Loading up the XMP profile sets the memory speed to 1600 MHz and the timings to 8-8-8-24-1T at 1.5V.
These are confirmed for us in CPU-Z.
The memory had no trouble reaching the 1600 MHz advertised speed so we decided to see how far we could push it. Getting the memory to 1866 MHz was very simple as the motherboard automatically loosened the timings slightly to 10-10-10-28-2T.
We decided to use these settings for our overclocked tests. See validation here.
We didn't have much luck pushing the memory further. We tried upping the voltage and loosening the timings further but we couldn't get the system to boot in Windows at 2133 MHz.
They make excellent memory kits, bit expensive though compared to some at the same speeds
I bought a Mushkin kit a year ago and my system was never stable with the kit in. I have a very skilled friend who came around and worked out that one of the sticks was faulty. We had the kit replaced and the new one failed within a month. I had it replaced again.
The last one is working still, but I would have concerns over their quality control.
I would buy the redline memory, its much better grade for overclocking. this stuff is average. wouldnt touch it.