These are the settings I used for my 4.2ghz benches. Very stable and works great with the Mega Shadow.
As all kits of RAM/MB/CPU's are different these setting may not work for you.
My Memory is the Dominator GT 2000mhz 8-8-8-24 kit for X58. So I binned 2 of the best sticks out of the 3.
This was several days of tunning to get everything just right. I became good friends with MemTest LOL.
There is still a little bit more speed in here I can feel it
Plus I have done more tweaking as I moved up in OC, some of the voltage settins have changed also.
Gotta work on my watermarks