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Background:
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The 6GB Corsair Dominator GT DDR3-2000Mhz kit is validated for DDR3-2000Mhz 7-8-7-20 2T at 1.65v vdimm with Uncore validated at 1.6v. Uncore is key to memory clocks on Core i7/X58 platform and there requires a balance between vdimm and Uncore volts for Core i7 safety. On DFI uncore volts are termed CPU VTT, on Asus QPI/DRAM and on Gigabyte QPI/VTT. Since I'm using DFI UT X58-T3EH8 motherboard, I'll be referring to Uncore voltage as CPU VTT for the remainder of these tests.

Intel specified CPU VTT to max volts of 1.35v. And for Core i7 to remain safe, vdimm memory voltage needs to always be set within 0.5v of CPU VTT. So technically max vdimm for safe operation would be 1.35 + 0.5v = 1.85v vdimm. But folks have been benching at 1.55-1.65v CPU VTT to allow higher BCLK/Memory clock frequencies - the long term effects on Core i7 are unknown but I've been using CPU VTT for benching only between 1.21v to 1.65v with no problems for several months now with no adverse effects as yet. No one so far online has retailed retail Core i7 failing from such high CPU VTT/Vdimm settings as yet either.