ASUS MIVE-Z RAM options

[TCung82]

So i overclocked my i7 2600k to 4.7ghz and when using my ram (corsair dominator gt 4x4gb 1866mhz @ corsair default 1.5v) its unstable. When i bump up the dram voltage to 1.65v it becomes stable but im running beyond corsair specs for the ram and hitting the max dram voltage for sandy bridge. I can drop the dram voltage to 1.5v for all 4 dimms if i downclock to 1600mhz to be stable as well. 2x4gb 1866mhz @ 1.5v is stable but thatd be only 8gb vs 16gb. Ill be using the rig for gaming. What would u guys do:

4x4gb 1866mhz @ 1.65v (max voltage for sb, above the corsair 1.5v specs)
4x4gb 1600mhz @ 1.5v (stable and running at corsair default voltage of 1.5v)
2x4gb 1866mhz @ 1.5v (stable and running at corsair default voltage of 1.5v but then id be only running 8gb vs 16gb)

[HiVizMan]

What are your voltages for the VCCIO?

When you run with all the slots populated you are placing added burden on the CPU IMC that requires a increase in voltage to either the ram or the memory controller. The XMP profile will work as you have noticed with two sticks of ram inserted. But when you add the other two that is when you have errors. You might have to increase a notch or two the voltages for your IMC to handle the extra work load.

[TCung82]

Its at 1.10v vccio. Thats all 4 slots at 1866 @ 1.5v

[HiVizMan]

Bump your VCCIO up one notch at a time and test for stability.