I think the amount of VTT you need depends somewhat on the cpu, board, and bios. Different boards or even the same board with a different bios may need more or less vtt, so it would be hard to judge which kit actually clocks better or needs less voltage unless you test them on the same setup.

16gb GSkill Ripjaws z pc3 1700c9-11-10-28 2T, passed hyperpi at 2133 9-10-9-28 1T on the Gigabyte P67a UD5, the 16gb Mushkin Redline 2133 kit also did the same. VDimm at 1.66v in the giga bios seems to read 1.68 in hwmonitor, vtt at 1.080v.



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