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Before 4/28 Beta Bios
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Prior to 04/28 Beta bios, had some weird troubles getting this memory consistently single Super Pi 32M stable at rated speeds of DDR3-2000Mhz 7-8-7-20 2T (tried 1T as well) at 1.64v-1.66v vdimm. I tried CPU VTT between 1.4-1.66v and didn't help. Strange part is I'm 8x HCI memtest stable at 1.64v vdimm and 1.44v CPU VTT and can 3dmark at those settings @DDR3-2000Mhz 7-8-7-20 1T. I could even run 8x32M Pi (HyperPi) tests at higher memory frequencies than I could run single Super Pi 32M. Consistently, single Super Pi 32M stable was only around DDR3-1870Mhz 7-8-7-20 1T/2T at 1.64v on bioses prior to 04/28 Beta.

Luckily, I tried a second 6GB Corsair Dominator GT kit from Corsair which was better for single Super Pi 32M up to DDR3-2000Mhz 7-8-7-20 but beyond DDR3-2000Mhz, memory frequency still had single Super Pi 32M inconsistencies at memory frequencies which were lower than what I could achieve with 8x 32M Super Pi (Hyper Pi).

This single Super Pi 32M issue wasn't specific to DFI X58 boards, but also occurred with early EVGA X58 bios based boards as well. There was various discussed work arounds related adjusting Round Trip Latency (RTL) and DDRAM VREF voltages posted here.

With VREF adjustments on 2/27 beta bios DDR3-2209Mhz 7-8-7-20 1T was the maximum single Super Pi 32M I could achieve which was a huge improvement over what I could previously achieve on 2/27 beta and previous bioses. Although, the max CPUZ validation memory frequency was still a bit lower than what I could achieve on 1/23 beta bios.

@DDR3-2286Mhz 7-8-7-21 1T at 1.875v vdimm bios set (~1.880v real DMM)

Still not close to my best I did with 1/23 beta bios.