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Thread: Overclocking P55 With 4 DIMMS

  1. #1
    ta2
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    Overclocking P55 With 4 DIMMS

    Had a nice stable overclock of the following:

    i5 750 @ 20x200
    2x2GB @ 2000MHz CAS9, 1.65V

    Added another 2x2GB of the same sticks (which are rated up to 2133MHz CAS9). Got a BSOD straight away so went back down to stock speeds. I'm now running at the following, but it's still a little shaky:

    i5 750 @ 20x200
    4x2GB @ 1600MHZ CAS7, 1.6V

    The memory SPD is rated at:

    1333, 7-7-7-24 @ 1.5V
    1522, 8-8-8-28 @ 1.5V
    2133, 9-9-9-28 @ 1.65V

    Are the SPD settings a little too tight when using 4 DIMMS, should I just lower the timings on the memory a little bit? Is there any disadvantage to running the DIMMS at a low frequency (say 1600MHz) at their rated max of 1.65V other than heat/power requirements, even if they don't require that much? Obviously that would be just for testing purposes.

    Cheers!
    Workstation: Antec 902, Intel i5-750 Quad @ 4GHz (1.30V), Corsair H50, Gigabyte GA-P55-UD4, 4GB Geil Ultra Series PC3-17000 @ 2000MHz CAS8, 8800GT, 2x2x1TB Spinpoint F3 RAID0 (roll on EFI and cheap SSD!!!)
    HTPC/File Server: Antec 900, Intel E3200 Dual @ 4Ghz (1.36V), Akasa Nero, ASUS P5Q Pro, 9400GS, 4GB DDR2, 1x750GB Spinpoint F1, 4x750GB Hitachi Deskstar RAID5

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    SeƱor Member Flewis's Avatar
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    Re: Overclocking P55 With 4 DIMMS

    Have you upped the northbridge voltage. An increase is usually required when moving to 4 dimms

  3. #3
    jim
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    Re: Overclocking P55 With 4 DIMMS

    You'll always struggle with 4 DIMMs, and AFAIK raising the northbridge voltage as mentioned previously is the only thing you can do, although it doesn't solve the problem.

    2x4GB matched DIMMs are the answer, although maybe not just yet.

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    Senior Member Pob255's Avatar
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    Re: Overclocking P55 With 4 DIMMS

    Quote Originally Posted by Flewis View Post
    Have you upped the northbridge voltage. An increase is usually required when moving to 4 dimms
    P55 = What north bridge?

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    ta2
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    Re: Overclocking P55 With 4 DIMMS

    Do you guys mean the QPI/VTT voltage? What's a safe level for that, I think I'm on 1.1V at the moment.
    Workstation: Antec 902, Intel i5-750 Quad @ 4GHz (1.30V), Corsair H50, Gigabyte GA-P55-UD4, 4GB Geil Ultra Series PC3-17000 @ 2000MHz CAS8, 8800GT, 2x2x1TB Spinpoint F3 RAID0 (roll on EFI and cheap SSD!!!)
    HTPC/File Server: Antec 900, Intel E3200 Dual @ 4Ghz (1.36V), Akasa Nero, ASUS P5Q Pro, 9400GS, 4GB DDR2, 1x750GB Spinpoint F1, 4x750GB Hitachi Deskstar RAID5

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    Pre-Cambrian nibbler's Avatar
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    Re: Overclocking P55 With 4 DIMMS

    VTT is the memory controller. I think you should be safe at 1.3 (they did it in customPC...)

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