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Originally Posted by Jpmboy 
Yeah. Sandy's memory controller is spec'd to 1600 and lower (same for Ivy?). So that could be one reason, but in general and only my own experience, 4 sticks do not OC as well as 2. In this case, the memory is rated at 1866, so is it really a memory OC or actually a cpu memory controller OC? The latter, yes?
Yeah. Sandy's memory controller is spec'd to 1600 and lower (same for Ivy?). So that could be one reason, but in general and only my own experience, 4 sticks do not OC as well as 2. In this case, the memory is rated at 1866, so is it really a memory OC or actually a cpu memory controller OC? The latter, yes?
Yea both my z68 and the z77 seem to be 1600 native and all higher speeds at OC. Even w/ the old 775 socket having 4 dimms full always made it harder to OC. I think its a memory overclock that being forced through changing the SPD ratio(1600mhz is 1:6 ratio).
The old 775 socket you would usually run a 1:1 which would make your ram double your FSB. So a 400mhz fsb and 1:1 SPD would make your ram run at 800mhz. Then if your ram could OC higher then your FSB you could force a higher ratio maybe a 1:2(IIRC) which would keep your FSB at 400 and force overclock your ram to 960mhz (400 x 1.2 = 480, 480 x2 =960)
Ive only ran 1600mhz ram in my board and never had 4 dimms full on this board or others so i haven't ran into this type of issue.
This is why i was also wondering if maybe VTT could be the issue since this is linked to the IMC? From what ive read though your supposed to have a roughly a 0.5 difference between Ram voltage and VTT so 1.5 - 1.047 (my VTT on auto) = 0.453 but then some threads were seem to be saying VTT can safely go up to 1.1v.
Many seem to increase VTT w/ 4 dimms or when overclocking their ram but i havent had to play w/ this at allEdited by Lucky 23 - 2/19/13 at 12:42pm
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). VTT could address his 1866 problem. I think he is at 1.65V to dram, so there is some room to work. I was leery of raising vtt when working the the 4 sticks of 2133 i had ( the new 1.5V gskills). I have no/low experience with VTT so wont be much help.
