QPI/VTT Voltage for 12GB a problem.

I would start off relaxing the timings. Remember it is harder to overclock your ram controller with all slots full.
 
QPI/VTT voltage should remain within 0.5v of your RAM voltage to avoid damage.

Running it higher than the RAM voltage will most likely not see any difference except higher CPU temps.

I would try 1.3v or 1.35v QPI/VTT to start out with.

What motherboard do you have? Do you have the latest BIOS for your motherboard?
 
cyclone3d said:
A full kit should run with manufacturer specified voltage and timings.
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That would be fine if the memory controller officially supported 1600MHz ram. Every CPU is different and all that Intel guarantees is that their memory controller on lga1366 will run at 1066MHz.
 
drescherjm said:
That would be fine if the memory controller officially supported 1600MHz ram. Every CPU is different and all that Intel guarantees is that their memory controller on lga1366 will run at 1066MHz.
Click to expand...

Which is why you have to raise the QPI/VTT voltage...

When was the last time you saw a 1366 CPU that could not run 1600Mhz RAM?

With everything else stock it should have no problems whatsoever running 1600Mhz RAM.
 
crosstalk and interference increases as you pack more memory modules into the same tight space. often when you have all 6 slots populated (double the amount of signals in the same physical space) you will have to run one step under the rating for the ram (ie. 6x sticks of 1600mhz will only be stable at 1333mhz). the higher the frequency and the more signals passing thru that area of the motherboard, the more noise you introduce into the signal. this is true with all high frequency signals. it has a lot to do with how well your motherboard model was designed. a good clean power source and adequate grounding will also help.
 
To the OP, have you tried just running the second 6gb kit of RAM to make sure it would run at the g.skill advertised speeds by itself? That would be the first thing I do, and if the second kit you got works fine, then maybe try running at 12gigs at 1.65v, the upper end of the rated voltage. Also a bump to the QPI/DRAM core voltage to 1.4-1.5 may help. Not sure if that is the same thing as QPI/VTT on a gigabyte board. good luck
 
I am running 12GB as well on my X58 board. 9-9-9-24 at 2000MHz with Kingston Elpida BBSEs.
With your current config, you would have to find the max bclock for your setup first:
Lower the CPU and DRAM multiplier a notch and do trial and error:
Maintain your voltage constant at the maximum you intend to run and keep on raising the bclock until LinX or Prime crashes. Or lock your speed and keep on raising the Vtt/QPI voltage until you get LinX stops crashing. The next thing I did is to then raise the memory multiplier to where I wanted the memory I wanted to run and kept on raising VDIMM until I found the point of stability on Memtest.

Each CPU's memory controller behaves a bit differently but I ended up at 2Ghz with 1.67V on the Vdimm and 1.34V VTT. As rule of thumb on your DO Chip, do not exceed 1.4V on the VTT.
 
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