Quote Originally Posted by Brahmzy View Post
This is on an ASUS P6T WS Pro FWIW:

CPU - 19
BCLK - 211
DRAM Freq - 1269 (624.5 (2:6))
UCLK - AUTO (Can go up one step further, but I see no tangible perf. benefit)
QPI Freq - AUTO
DRAM Timing - 8-9-9-23, 1T (any lower and Prime+LinX BSOD's at 4.0GHz)
CPU V - 1.375 BIOS (2 increments lower and Prime+LinX locks box up, no BSOD)
CPU PLL V - AUTO
QPI/DRAM V - AUTO
IOH - AUTO
IOH PCIE V - AUTO
ICH V - AUTO
ICH PCIE V - AUTO
DRAM BUS V - 1.60 (any higher up to 1.66 doesn't seem to help anything except heat up my CPU more. 2 increments lower and Prime+LinX BSOD's)
All other DRAM V - AUTO
LLC - EN
CPU DIFF - AUTO
CPU Clock SKEW - AUTO
CPU SS - DIS
IOH Clock SKEW - AUTO
PCIE SS - DIS

HT - EN

All other Intel CM/TM/VT crap is off.

<snip>
Thank you - Im back on track again. My issue seemed to be memory timings and not vcore of QPI volts.

I have been successful with 19*210 @ 1.36v CPU-Z reported volts with QPI at 1.35 (bios).

I have managed to get memory timings working at 8-8-8-24 at 839Mhz, 3356.1Mhz once I increased the write delay timing out to 15 from auto.
This has increased my stability no end and is possibly due to apps like Linx and prime writing a hell of a lot to RAM.

It might be worth you having a play and see if yu can get the extra memory bandwidth which might just give you a bit extra for your money.

Im running Corsair DDR3 1600Mhz dominators at 1.65v

thanks again for your pointers, much appreciated.
great thread everyone - Im loving thi i7 platform although it isn't as easy to overclock at 4ghz as I had heard!

Ian