4ghz stability problem

[coolamasta]

Hi people, am rather fed up now at getting my i7 920 stable at 4ghz so if anyone can help it would be much appreciated!

Machine spec:

i7 920 D0 stepping
Asus P6T Deluxe V2 with 0504 bios
OCZ Reaper 6GB (3x2GB) DDR3 PC3-12800C7 (1600MHz)
Corsair TX650 PSU

Its also water cooled in a Antec 902 case so plenty of airflow and temps are nice and low IE CPU gets to around 68ish on full load @ 4ghz its just trying to keep it at 4ghz thats a pain!

Heres how far I got creeping up through the voltages etc in the Bios, its got a bit better but still locks up while stressing under LinX!

CPU Ratio = 20
BCLK Freq = 200
PCIE Freq = 100
DRAM Freq = 1603
VCLK Freq = Auto
QPI Link Data Rate = Auto

Mem timings manually set to 8-8-8-24 even though they are rated at 7-7-7-24

CPU Voltage = 1.35000
CPU PLL Voltage = 1.88
QPI/DRAM = 1.37500
IOH Voltage = 1.2
IOH PCIE Voltage = Auto
ICH Voltage = 1.2
ICH PCIE Voltage = Auto
DRAM Bus Voltage = 1.64
Load Line Calibration = Enabled

Speedstep = Disabled
C-State = Disabled

Everything else is set to Auto

I have played with everything else on lower settings in different combos but no matter what I try after anywhere between 5 and 30 mins the PC will lock up/freeze (no rebooting and no BSODs) Its being stressed under Vista x64 & LinX 0.6.2

Fed up now so hoping someone will have an idea what to try next, I am a bit loathed to go over 1.35000 on the CPU V core though....

So yeah, err help! lol

 

[lopri]

Try 21x190 instead of 20x200. x20 multi is difficult due to the way QPI works on X58.

 

[coolamasta]

Ah thats interesting cheers bud, I didnt want to use the turbo multiplier if I could help it, wonder if the board would be ok with 19x211....

 

[Hyperlite]

nvm

 

[coolamasta]

Thanks for the replies people.

Its perfectly stable running 21x191 @ 1.32500v core but I would ideally not like to run the 21 turbo multiplier. I tried 19x210 and had the same issue, would run LinX for about 10-30 mins and lock up or reboot itself.

One thing I haven't tried yet which im hearing is to turn OFF Load Line Calibration? What you think?

Cheers

 

[sxr7171]

How I finally settled on mine was 195X20(21). So I'm at 3.9Ghz but whenever there is a load that needs it the CPU goes to 4.1GHz stable. All that matters is the speed when needed IMHO.

I tried 4.0/4.2 and couldn't get it stable. I'm happy with what I consider to be in practice 4.1Ghz.

 

[GLeeM]

Kind of looks like might be memory holding you back? Reason I think that is it works at the lower BCLK. Have you tried it at 200x20 but with the memory at the next lower multi setting?

I have the same board and run at 190x21 @ 1.264 V, ram at 1560
With a TRUE (ambient 72F) it idles at 40C, full load at 76C (24/7 - I run DC)