Well that depends on your BCLK and the quality of your chips IMC (and also on whether your mems can actually handle 2000 Mhz), but I guess you'll need at least 1,5V VTT, more like 1,55-1,6V to be stable.
Also don't forget the 10x divider is still bugged on the DFI, meaning it takes more Vdimm than it should. For example, I need 2,05V to pass memtest at 2000 CAS 8-8-8 with my 6GB CSX Diablos using the 10x divider, however if I run it at the same speed using the 12x or any other divider it only needs 1,95V to pass.
Of course none of these settings work in windows so far, so I'll need to fine-tune that freakin thing some more. Seems I got a crappy IMC anyway. AND a coldbugged CPU as well, argh

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