I've recently put this build together and haven't been able to get my G.Skill RAM to clock correctly on this mobo. Its unstable at 2000MHz and 1.65V under the XMP profile and can't boot into windows. The mobo clocks it by default at 1066MHz and 1.5V. I understand that undervolting the RAM will cause it to do this, but to run it at the intended frequency and voltage is unstable? What am I missing here?
Here's the first thing you are missing: Intel makes absolutelyno guarantees for any i7/x58 memory speed other than 1066 - these are simply in the 'unsupported' realm, and thus, no motherboard manufacturer or memory maker can validly claim, without exception, that "this will work!" This also applies to QPIs other than the officially supported 4.8 & 6.4 - Intel's position is, unequivocally - don't do it!
The next thing to be aware of is that the i7 doesn't much care about actual RAM transaction speeds - it doesn't scale sufficiently to be even close to the point of subjective 'notice'; i.e., 1066 - 1600 - whatever, it won't make any real difference to you as a user...
http://www.tomshardware.com/review [...] 25-11.html and I quote: "High End Memory Is Not Worth The Money", when it comes to 1366 systems!
That said, today I will be doing a lot of research correlation, and trying to come up (everyone's got to start somewhere...) with some first approximation recommendations for some i7 problems; I can't guarantee I can help with getting the whole 2000 out of it, but I'll bet we can at least get it stable at 1600 for starters...