help in tuning F3-17600CL9D-8GBXLD

[Snakeyes]

I have a brand-new build on the MB GIGABYTE|GA-Z68X-UD7-B3.? ? 2600K watercooled.

At present I am running the memory F3-17600CL9D-8GBXLD as follows: ?
memory clock: 936 MHz
memory speed: DDR 3-1872
DRAM: FSB 28:3
memory timing: 9-11-9-28 CR 2
rest of the memory timings settings are set to AUTO
DIMM voltage: 1.64 V
VTT voltage: 1.2 V

If I set the memory clock any higher the computer refuses to boot. On the other hand, at this speed I have run memtest overnight with no errors and LinX(50 runs) and prime (five hours). The PC has a stable overclock at 4.7 MHz. C-1/C6 enabled.

Can you please suggest how I can loosen the timings to attempt to reach the next speed level for this memory. Obviously any suggestions on voltage settings would be greatly appreciated.

[Tradesman]

Have you tried enabling XMP

[Snakeyes]

Yes I did, and when the system failed to boot, I left the XMP basic settings unchanged (entered them manually 9-11-9-28, the balance at auto) but reduced the System memory multiplier (SPD) to 18.66 . That is where the system is now and running stable through all the tests.

[Tradesman]

May need a little extra voltage in VCCIO and/or DRAM for full speed ahead

[Snakeyes]

Thanks Tradesman, any idea how far I can push these voltages without damaging the ram?

[Tradesman]

Just take it up in small increments to get stable as each mobo/BIOS is different and how the PSU puts out power can vary

[Snakeyes]

Had to take DIMM to 1.68V. System running smooth at 32:3. Love it.
Will run Memtest overnight. I hope this voltage is not over the top ?
Thanks a lot. Gskill rocks.

[Snakeyes]

Unfortunately the memory failed memtest. Is it risky to take DRAM to 1.7 or above (presently at 1.68V). Similarly how far can I push VCCIO presently at 1.2 volts. Thanks

[Snakeyes]

My memory is failing memtest at rated specs. I have pushed DRAM to 6.8 V and VTT to 1.2 V with no success. I am reluctant to go any further if it risks damage to the memory. Should I RMA this very expensive set?

[GSKILL TECH]

VTT should not need to be so high, try a lower voltage. More around 1.10V

Thank you
GSKILL TECH