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Thread: Is it possible to OC E8400 to 4.00Ghz with PC2-6400 RAM?




  1. #11
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    Default Re: Is it possible to OC E8400 to 4.00Ghz with PC2-6400 RAM?

    gskill black pi 6400 mem(800mhz)

    recommended v for memory at 800mhz 1.8-1.9v
    1.8-1.9 is the only recommended voltage range for this memory

    bios settings will undervolt by .02-.04
    except auto (1.8) will give 1.82-1.84v in bios to maintain over 1.8v under load.

    800-900 mhz (400-450 fsb ref with a 2x multiplier) requires 1.84-2.0V in bios at 4-4-4-12 timings.
    900-960 mhz (450-480 fsb with a 2x multiplier) requires 1.9-2.04V in bios at 5-5-5-15 timings .

    Above that the voltage needed to run the memory increases rapidly.

    Assuming your 800 memory overclocks reasonably well as youve tested it,with a low cpu multiplier. You should be able to overclock the cpu with a higher multiplier /higher fsb with the appropriate non extreme mch and cpu voltages.

    there isnt much point in whacking in a fsb ref of 445 to see if the cpu will do 4.0ghz stable while just increasing the Vcore voltage.See what fsb ref speed your memory will run at stable first.
    Last edited by kick; 06-09-2009 at 07:27 AM.
    Current Systems:

    Asrock p67 Extreme6.............. Gigabyte EP-45 UD3 ...................... Gigabyte 73 PVM S2
    Intel i5 2500k 4.8ghz................ Intel Q8400 3.8ghz......................... Intel D820 2.8ghz
    Zalman 10x cooler.................... Coolermaster V8............................ HP cooler
    8GB Gskill ripjaw ddr3.............. 4GB Gskill PI ddr2.......................... 4GB samsung ddr2
    60GB ssd/500GB HDD .............. WD 1TB hdd.................................... Seagate 160GB hdd
    GTX 460 1GB x2 SLI ................. Msi 9600GT 512MB(died) ........... Onboard gx
    Win7 64 ,750w psu(ocz)............ Win7 64 ,520w psu,seasonic...... Win XP pro ,400w psu

    HEC 6A34 case . ....................... Jeantec R2 case............................ Packard Bell case

    hoping to upgrade to http://www.thinkgeek.com/stuff/41/habicase.shtml
    http://www.flixya.com/video/140325/Animal-launching

  2. #12

    Default Re: Is it possible to OC E8400 to 4.00Ghz with PC2-6400 RAM?

    I don't really have much input as I have 1066MHz RAM and tend to stay at or under that value. However, I would recommend that you try to find your stability with only 4GB installed at first. If for no other reason, at least you will still have 4GB of RAM left if you burn them up...

    Seriously though, as the others have said, it will be easier to find some stability overclocking your memory if you have less of it on board. Also, the more RAM you have installed the looser the tRead needs to be and the higher the MCH Core will need to be. For 8GB of RAM at 445x9 expect to set MCH Core near 1.28.

    Quote Originally Posted by 445x9
    CPU Vcore….………................................:1.35
    CPU Termination…..... 1.200V*...............:1.26
    CPU PLL…………………....1.500V*.......:1.5
    CPU Referen.…………....0.755V*...........:

    MCH/ICH
    MCH Core…………….....1.100V...........:1.28
    Quote Originally Posted by 500x8
    CPU Vcore….………................................: 1.35
    CPU Termination…..... 1.200V*...............: 1.28
    CPU PLL…………………....1.500V*.......: 1.5
    CPU Referen.…………....0.755V*...........: .76

    MCH/ICH
    MCH Core…………….....1.100V...........: 1.28
    Good luck, though. I hope you succeed!
    Quote Originally Posted by Alex St. John
    Consider for a moment that what we think of as “intelligence” is the byproduct of a computing architecture that depends on massive parallelism to interact with the world in real time without stalling for progress bars. If our ancestors’ brains had depended on running Vista on current dual-core processors for their survival, they would have been eaten by bears.

    Best Quote Ever...
    Quote Originally Posted by Psycho101
    Obey the one and only rule without question when you overclock.... don't cause a fire. Fires are hot and burny... not good.
    Intel E8400 EO@445x9--Gigabyte EP45-UD3P v1.1 ~ F9--EVGA 9800GT @ 700/1750/1100--8GB Gskill 1066

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