@johnspack Regardless of CPU you get on X99, UnCore clock WILL limit max. bandwidth you get out of your RAM on X99 platform.
For Sandy/Ivy, UnCore simply works at Core frequency, while for later platforms it's at ratio.
Most of magic latency performance for DDR4 comes from secondary and tetriary timings.
Default settings (and even XMP), tend to keep those loose.
I didn't played with Haswell-Es, went straight to Broadwell-E. 3000MHz liked on first try, 3200MHz on second.
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i7 6950X was the "hot cookie" after OC, even before it became trendy for all Intel platforms
1.25-1.3V is realisticly max. on Air (depends on case/fan setup/cooler/etc).
For Haswell-E, OC Socket is needed to get most out of the UnCore but (it's not necessary for Broadwell-E).
As for Voltages, I use X99 SOC Champion from GB.
Vcore and VSA and needed most (second one for IMC/DRAM), next is Vring + VCCIN (Vring is for ring bus, and VCCIN is input for FIVR).
Lastly, I got VCCU offset (it's second voltage for IMC, not sure how other manufacturers named it), and VCCIO (PCIe/DMI/etc.).