Overclocking E8400 & P5QL Pro (unstable)

Okay so I have been attempting to OC my system recently. Everything I have read says that ocing E8400 should be easy as pie especially seeing as the OC i want to perform is very small.

I am trying to take my E8400 from 3.0ghz ot 3.6ghz. Now what I have done is Increase FSB to 400, set the ram/cpu to 1:1 ratio, and manually set my Ram timings to 5-5-5-12 as per specifications.

I have an aftermarket Scythe cooler installed with a Corsair PSU. I have disabled all the powersaving features.

After FSB was set to 400 (at 9x multiplier) I just slowly started bumping Vcore up each increment trying to find a stable overclock.

Around the 1.35 Vcore mark I was finally able to boot into windows however after 5 minutes the system would BSOD and reset. After I continued to bump this up all the way to 1.39 Vcore my system stopped booting into windows.

I have left all other settings to AUTO.

Why wont my chip overclock? Am I doing something wrong? Is there a setting I sohuld be playing with which I am not?

I will post up some SS of my BIOS later but here is everything as I set it:

FSB 400
PCIE 100
FSB Strap to Northbridge 400mhz
DRAM Frequency – DDR2 800mhz (as my ram is)

Dram Timing 5-5-5-18 (as my ram states) everything else under ram is Auto.

LLC : Enabled
CPU GTL : Auto
CPU Spread Spectrum: Disabled
PCIE SPread SPectrum: Disabled
CPU Clock Skew: Auto
NB Clock Skew: Auto
CPU Margin Enhancement: Performance mode.


CPU Ratio Setting: 9.0
C1E Support: Disabled
Max CPUID Value Limit: Disabled
Intel Virtualisation Tech: Disabled
CPU TM Function: Enabled
Execute-Disable Bit Capability: Enabled

OKAY theres all my settings.

Now the only settings left to adjust are the Voltages.

CPU Volatge
FSB Termination Voltage: AUTO
Memory Voltage : AUTO
NB Voltabe : AUTO
SB Voltage : AUTO
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More about overclocking e8400 p5ql unstable
  1. As promised here are SS's of my BIOS settings which I had changed. The Vcore I had it set as was just an example. Nothing I did kept my PC stable.

    Also my system specs are:

    Intel Core 2 Duo E8400 @ 3ghz
    Asus P5QL Pro
    Corsair DDR2 800mhz 4gb Kit (2x2gb) 5-5-5-18
    ATI Radeon HD 4870 512mb
    Creative X-Fi GamerPro Soundcard
    Scythe Ninja CPU Cooler
    Corsair HX-520W PSU

    If you need any more information please let me know.
  2. What does CPU-Z say your FSB:RAM ratio is?
  3. jsc said:
    What does CPU-Z say your FSB:RAM ratio is?

    For the 5 minutes I was able to get into windows it was listed as 1:1

    Also before Ocing (i.e. now) it says 5:6
  4. Ok back to the OC thing:

    I just went back into the bios and only changed three settings:

    FSB: 400 mhz
    PCIE: 100 mhz
    DDR: 801 mhz (1:1 ratio)

    That was it. Left everything as AUTO and it booted straight up not an issue @ 3.6ghz

    Prime95 had a rounding error. Cpu-Z reported Vcore at 1.21 so I am assuming that by leaving everything as AUTO and now just slowly bumping Vcore up I will achieve stability. What yas reckon?
  5. From the pictures above I would do a few things. First turn on load line calibration. Second I would set the CPU voltage manualy to 1.25v +/-.05v it shouldnt need more than that to run at 3.6ghz. As for fsb and north bridge voltage you can play with them if you want but they should be ok on auto unless you overclock the cpu and/or the memory more. oh and make sure the CPU dont go over 70c in Prime95.
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