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Thread: Weekend Tweaking : Pushing my E8400




  1. #1
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    Default Weekend Tweaking : Pushing my E8400

    I managed to pick up a nice "SpotCooler" for my rig. Absolutely love it. It screws to one of your mobo mounts. It was exactly what I was looking for. I have it blowing across my memory and NB heatsink.

    Attachment 2817

    Ok heres where my hellish weekend begins!

    I install my new fancy spot fan. My CPU under full load dropped about 4C. So now its time to see how high I can clock my E8400 on air with reasonable Voltages.

    All voltages are from CPUZ under full load running IBT.

    -----------------------
    4.1Ghz vcore 1.34 / 2.4B strap / FSB 456 memory@ 1094Mhz tRD9 Dram 2.1v / IBT"High" 10 pass : success / Small FFT's 2hrs good / Large FFT's FAIL within 2min
    -----------------------
    4.2Ghz vcore 1.34 / 2.0D strap / FSB 467 memory@ 934Mhz tRD10 Dram 2.1v / IBT"High" 10 pass : success / Small FFT's 2hrs good / Large FFT's FAIL within 2min
    -----------------------
    4.4Ghz vcore 1.37 / 2.0D strap / FSB 489 memory@ 978Mhz tRD10 Dram 2.1v / IBT"High" 10 pass : unstable " No further testing at this speed " I go back to focusing more on 4.2Ghz
    -----------------------

    So I set everything back to 4.2Ghz. I try pushing my vcore to 1.36v. IBT and Small FFT's are fine once again. But as soon as Im doing Blends and it kicks off a Large FFT, hardware failure. So im thinking my memory is bombing out on me. Since Large FFT's actually stresses your Memory.

    So I go into my bios, up my DRAM to 2.12v and up my MCH from 1.26v to 1.28v and boot back into windows.

    Go to launch Prime95 Large FFTs' and BSOD. WTF!! confused.

    I give up and set everything back to 4.05Ghz. Like I had prior. IBT tests fine, Small FFT's fine, but when I start a Large FFT's it fails almost immediatly. So now Im REALLY confused/frustrated.

    I go online and read something about G.Skill memory actually not working well with high voltage. So hey, why not try something different.

    I go into my BIOS, drop MCH to 1.24v and my Dram to 2.06v. Boot into prime95. Baddabing! Had Large FFT's running for well over an hour this morning before work without ANY issues. IBT HIGH did 10 passes without any issues. This is a 1.328 vcore.

    So.. I have yet to tweak/tinker more. But Im wondering if I can keep my DRAM/MCH voltages low, and hopefully THAT will resolve my stability issues at 4.2Ghz+

    My temps at 4.2Ghz in IBT were only topping at 70C which is fantastic since Prime95 never even breaks 60C now. This was with my vcore @ 1.34

    Thoughts, Advice, Comments?

    Thanks.
    Last edited by Triton05; 08-16-2010 at 10:44 PM.
    ASUS P8P67 rev3.1 | i5 2500K @ 4.5Ghz | Vcore: 1.300
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  2. #2
    Lsdmeasap's Avatar
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    Default Re: Weekend Tweaking : Pushing my E8400

    Nice testing you are doing!

    Yes, higher voltages can lead to instability just like not enough, something not everyone keeps in mind.

    You didn't mention Vtt, this also has a large effect on stability and or what you can push your memory to, as does MCH Ref.

  3. #3
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    Default Re: Weekend Tweaking : Pushing my E8400

    vtt for 1.328v was 1.30
    vtt for 1.344 was 1.32
    vtt for 1.36+ was 1.34

    It appears I had the ' CPU ' stable. Taking into account I passed IBT with flying colors and Small FFT's since that utilized JUST the L2 cache on the cpu.

    It took a bit for me to realize that the Larget FFT's exceed the L2 cache size, so in that affect.. its stressing the CPU to memory bridge.

    Right now, with my MCH at 1.24v I think its reference is .96v maybe? trying to remember off the top of my head.

    Id love to get 4.1Ghz stable with the 2.4B strap. Talk about memory bandwidth! ;)
    Last edited by Triton05; 08-16-2010 at 11:26 PM.
    ASUS P8P67 rev3.1 | i5 2500K @ 4.5Ghz | Vcore: 1.300
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  4. #4
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    Default Re: Weekend Tweaking : Pushing my E8400

    You may want to try a lower Vtt as well, did you try that or do you think it always needs 1.3 or above at these speeds?

    MCH ref must be set at 1.20Vtt, so .96 would not be what you should think of it as. At 1.20Vtt default is .76 MCH Ref, more or less while Vtt is at 1.20 is how you change it, then change Vtt back to what you want to use.

  5. #5
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    Default Re: Weekend Tweaking : Pushing my E8400

    As I recall, some Gskill 4GB 1066 memory kits were only stable with MCH Core = 1.05 (this isn't a typo).
    VTT (Cpu Termination) settings have a major effect on stability. Keep VTT lower than CPU Vcore, preferably by at least 0.05 volts.
    Most E8400 setups at 4GHz or higher require tweaking MCH Reference (and sometimes CPU Reference) settings by lowering the setting by 1 - 3 clicks.
    The basic procedure for this mod is:
    1. Temporarily set CPU Termination (VTT) = 1.20
    2. Make desired adjustments to either or both of these Reference settings (MCH Ref and/or CPU Ref).
    3. Set VTT back to the desired setting
    This procedure is from Lsdme's http://forums.tweaktown.com/gigabyte...-easytune.html thread.
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  6. #6
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    Default Re: Weekend Tweaking : Pushing my E8400

    Ever since I OC'ed to 4.0Ghz, Ive had my Vcore @ 1.328 LOAD with LLC enabled. My Vtt was 1.30 and never gave me any issues. I always thought I was supposed to keep it a smidge under what my " Load " vcore value.

    As for the MCH Ref. Like you pionted out, that scales with the MCH voltage. Right now with my MCH at 1.24v my MCH ref is either .96 or .98. Should it be higher, or lower? at the moment, Im back to being solid/stable at 4.05Ghz with my current spec's in my signature.
    ASUS P8P67 rev3.1 | i5 2500K @ 4.5Ghz | Vcore: 1.300
    MSI 460GTX Hawk Talon Attack (900/4000) | 23C Idle / 65C max load / +100mV
    Kingston HyperX | DDR3 1600Mhz | Corsair H60 | 36C Idle / 65C max load
    500GB Seagate Barracuda 7200rpm| OCZ 600watt SXS PSU
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  7. #7
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    Default Re: Weekend Tweaking : Pushing my E8400

    The general VTT guideline is that VTT should be at least 0.05 - 0.10 volts lower than the CPU Vcore setting.
    I don't know if having LLC enabled alters the general VTT recommendation.

    I wouldn't mess with your stable 4.05GHz setup, but if you want to o/c higher, you'll probably need to find the optimal MCH Ref setting.
    Some claim that they also needed to lower the CPU Ref setting with higher overclocks with their Core2Duo setups.
    Q9650 @ 4.10GHz [9x456MHz]
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    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
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    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
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    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
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    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
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  8. #8
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    Default Re: Weekend Tweaking : Pushing my E8400

    Thank you.

    BTW, my G.SKILL PC8500 2x2GB 5-5-5-15 kit is rated for (2.0v-2.1v)
    Well see how stability is tonight at higher CPU speeds with Dram voltage lower along with a lower MCH voltage.

    Ill try 4.2Ghz with a Vtt of 1.30 and a vcore of 1.344 Load. Ill leave MCH at its current 1.24v and a put my dram to 2.0v. (since Ill be using the 2.0D strap, the memory will actually be underclocked. So it shouldnt have any issue at all posting at 2.0v)

    This make sense?
    ASUS P8P67 rev3.1 | i5 2500K @ 4.5Ghz | Vcore: 1.300
    MSI 460GTX Hawk Talon Attack (900/4000) | 23C Idle / 65C max load / +100mV
    Kingston HyperX | DDR3 1600Mhz | Corsair H60 | 36C Idle / 65C max load
    500GB Seagate Barracuda 7200rpm| OCZ 600watt SXS PSU
    LG E2050T LED monitor
    3DMark11 P4560


  9. #9
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    Default Re: Weekend Tweaking : Pushing my E8400

    Makes sense, but that doesn't mean it will work. ;)
    You'll have to find the best balance of voltage settings, preferably by changing only one setting at a time.
    Some other C2D Gskill overclocks were not at all stable with MCH Core settings in the 1.2x range, sometimes at somewhat lower o/c settings than your current 4GHz o/c.

    Good luck with your large FFT tests.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
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    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
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  10. #10
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    Default Re: Weekend Tweaking : Pushing my E8400

    Quote Originally Posted by profJim View Post
    Makes sense, but that doesn't mean it will work. ;)
    You'll have to find the best balance of voltage settings, preferably by changing only one setting at a time.
    Some other C2D Gskill overclocks were not at all stable with MCH Core settings in the 1.2x range, sometimes at somewhat lower o/c settings than your current 4GHz o/c.

    Good luck with your large FFT tests.

    Thanks! Ill post an update tonight, or tomorrow after I get home from work and have ample time to tweak and test!
    ASUS P8P67 rev3.1 | i5 2500K @ 4.5Ghz | Vcore: 1.300
    MSI 460GTX Hawk Talon Attack (900/4000) | 23C Idle / 65C max load / +100mV
    Kingston HyperX | DDR3 1600Mhz | Corsair H60 | 36C Idle / 65C max load
    500GB Seagate Barracuda 7200rpm| OCZ 600watt SXS PSU
    LG E2050T LED monitor
    3DMark11 P4560


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