Help with OC i7 860

Good day everyone,

I have this old setup that Ive never OC (didn't need to), but since the capability is there and i got time, why not? smile.gif. I replaced the box with something newer and put more fans in it just as a precaution.

EVGA P55 SLI
i7 860 @ 2.8
EVGA GTX 660 2gb
Corsair Dominator 8g (2gx4) DDR3 1600
Corsair H60
NXZT Phantom with every fan you can install on it

Ive changed the following settings for OC:

Multiplier: 20x
Clockgen: Disabled
CPU Freq: 200
QPI: 4.270 GT/s
MCH Strap: 1600 Mhz

Without VDroop
CPU VCore Boot: 1.3750V
CPU VCore Even: 1.3750V
DIMM: 1.65V
CPU VTT Boot: 1.375V
CPU VTT Even:1.375V
PCH: Auto
PLL: Auto

DRAM Freq: 1067(2:8)
C1E, SpeedStep and C-STATE Disabled

HT ON

My goal right now its to hit 4.0G for 24/7.

My Problem is that at idle the system run at about 38C ~40C and once i run Prime95 Blend, it goes all the way up to 80C~82C. I don't like these Temps and im sure a long blend test will net some errors.
I have a basic understanding of these settings and although every setup/hardware is different i would appreciate any advice you may have on what to change to improve/stabilize it.
i will be posting some pics of what i am seeing. Ill appreciate any advice you may have.

You shouldn't need to supply more than approx. 1.325v for a 4.0Ghz clock, or as much as 1.375v VTT for 8GB of RAM running at 800MHz. Raise the PCI-E frequency to 104Mhz, then lower both the Vcore and VTT.

I followed your advice and lower the voltage. However the temps are not stable during P95. They just keep rising slowly until i stop it or BSOD (in less than 4min).I have reseated the H60 twice already with AS5.



The 2 fans readings at the bottom are the H60 Radiator fan and Pump.

Whats the impact/purpose of raising PCI-E frequency? If i raise it, Clock Gen gets auto enabled and it causes a double cold boot every time i turn on the PC

Thanks for help!

That's the way the CPU and PCI-E clock generators work. Leave the PCI-E frequency at 104MHz, and make sure Turbo is disabled.