My mainboard is a Asus Sabertooth Z77, latest BIOS. My current CPU is a 2600K. The original RAM I had installed was 4 x 2G of
ADATA 1333 8-8-8-24. I had overclocked the CPU to 4.5GHz with only a small voltage offset (+0.010). Sometime later, I replaced the RAM with 4 x 8GB of
G.Skill 1600 10-10-10-30.
With the new RAM, I find the CPU requires much more voltage for an overclock. I had to drop to 4.3GHz, and the voltage gets to 1.35v under full load. Setting the RAM to 1333MHz doesn't really help. I've spent hours tweaking both RAM and CPU settings.
Is it possible the IMC on the 2600K doesn't deal with 32GB of RAM? Would the 3770K handle this RAM better?
I can't be sure about the limits generated by 32GB RAM -- I have 16 or 2x8. It's 1866 9-9-9-24-1T and I use the XMP profiles to set it up at the stock latencies. 1T isn't "stock" but seems to be automatic with the XMP selection on my mobo.
Maybe you have a bad chip for the 2600K, maybe you don't -- but you should be able to get a higher clock. My sig settings have been bumped down to 4.6 Ghz mostly because the voltage is "more comfortable." The voltage is still "acceptable" at 4.7, bottoming out with severe load and droop to about 1.36/1.37.
I don't think I saw any posters mention your VCCIO or VCCSA setting which would volt the IMC. I believe that Sabertooth board shows "VCCSA" as the only adjustable item; the Z68's had "VCCIO". [Somebody can correct me if I'm wrong here.]
I found that I had to adjust the VCCIO for command-rate = 1 for both 4.6 and 4.7. If it defaults to around 1.00V, I had to tweak it up to 1.13V.
If it's too low, your BSOD stop codes may show "09C" in addition to 101 or 124.
As for "four slots filled." You have double the memory, but before I had the Ripjaws "Z" 2x8, I had Ripjaws 4x4 1600 @ 1866 and I was still able to run command-rate=1 without increasing the RAM voltage (1.50V). It only required a similar tweak to the VCCIO. And I never had to turn that up above 1.13V.
If there's some magical sensitivity of the IMC to the TOTAL RAM, I hadn't seen it, and I could doubt that 8GB sticks in 4 slots would behave differently than 4GB in 4. It's possible, but I can't see why.
ONE MORE THING, NOT TO BE OVERLOOKED. Your Offset +0.010V is fine; you could probably drop it to 0.005V (+) and then attend to "re-tuning." There is another voltage setting in your BIOS menus -- I'm fairly sure of it -- could be in CPU Power Management. It is for "Extra Voltage for Turbo." Take it off "Auto" and use that to adjust your voltage for stability. Generally, there's a perfect trade-off between Offset and "Extra." You can increase one, and decrease the other so that you come back with about the same load voltage reading. The "Xtra" is in increments of 0.004V, while the Offset is in increments of 0.005. Thus you could bump up Offset by 10, decrease Xtra by 8, and come back with a sliver of 0.002 addition to load voltage.
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