Q6600 unstable at 3.6Ghz

hi,
my Q6600 is stable at 3.4 ghz here are my bios settings
sb 8x425
CPU core ----- 1.45 v 1.4 v in full
CPU PLL 1.57 v ----- v 1.5 in normal
PCIex 101

enhance memory turbo
XMT profile2
DRAM v 2.2 - 555 mhz 15-1130
latch 400mhz
D ratio 2.66

MCH core ---- v 1.2 v 1.1 in normal

while the remaining normal ,for a 3.6 ghz oc unstable and tried several tensions
9x400 fsb
Core CPU I have installed a 1.45 v 1.52 v
CPU PLL 1.6 V ----- v 1.5 in normal
PCIex 101

enhance memory disable
XMT disable
DRAM v 2.2 - 555 mhz 15-1066
latch 400mhz
D ratio 2.66

MCH core I've climbed a 1.2 v 1.3 v ,while the remaining normal ...
I boot normally,testing under stress cpu and a few seconds later pc unstable.
Thanks in advance for your help!!!

it's a Q6600, a quad, and they go less well than the dual in overclocking, do not expect to be stable in aircooling to 3.6GHz, I was hard on my system.

It is possible to mount a 3.6 ghz for H24 in aircooling,especially that my temperatures are good in my full tower noctua and well ventilated. for my case I would rather on fsb hole or heavy cpu unstable, I must soon receive my new corsair 650W power supply, right now it is a green power 500w Forton, is performing well but it has a ripple of 0.07 this does not help.

hi,
my personal Q6600 has never held 4GHz, the maximum I could achieve is 3.84ghz with 1.50v (480 * on the maximus extreme chipset X38.Et in coef x9 I was to block 420de FSB (420 * 9 = 3780).Because the coefficient after the processor does not necessarily have the same limit has the same frequency.And on another kit ram in D fsb strap 400 does its not booting, while with larger fsb strap and another no problem.
So trying to go by step by lowering your ram frequency (With large non 5-5-5-15 timings),390 FSB setting, try to be as stable and its amount gradually.