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Thread: Overclocking advice on C2D and C2Q




  1. #1
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    Default Overclocking advice on C2D and C2Q

    Hi guys,

    I'm still running on an old Core 2 Duo E8500 E0 chip. It is overclocked from 3.16Ghz to 4.4Ghz (8x550FSB) on Noctua NH-D14 and Asus P5Q Deluxe. RAM is Corsair Dominator DDR2 OCd to 1100Mhz.
    I know it is old I know that the motherboard only supports DDR2 etc :) and yeah I know I should upgrade :)
    I managed to get hold of a C2Q Q9400 chip.
    I did a comparison on the 2 processors stock performance on Intel's website and apart from the 2 extra cores and a lower multiplier there isn't anything really. See link.
    http://ark.intel.com/compare/33911,35365
    Question is. Will I be able to OC the quad chip to an equivalent level that my current C2D processor is? If so what sort of speed should I aim for? I like sticking to high FSB (since the higher the better rule along with 1:1 memory ratio)
    I've got a feeling that I won't be able to get even close the what I've got now nd I'm afraid of making a step backwards with the new CPU.

    Any suggestions?

    Thanks in advance.

  2. #2
    Chike is offline Senior Member
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    Default Re: Overclocking advice on C2D and C2Q

    Just keep in mind that 4 cores can make double 2 cores work, it depends what you need it for

  3. #3
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    profJim is online now Chief Munchkin + moderator
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    Default Re: Overclocking advice on C2D and C2Q

    Your Q9400 can probably o/c to 3.50 - 3.60GHz and possibly a bit higher.
    I've seen a few 3.80GHz overclocks on the web with a "lucky" Q9400.
    As I recall the The Q9550 was a better overclocker and had 12MB of L2 cache.

    As Chike said, if you're running programs that can take advantage of all 4 cores you'll probably see an improvement.
    If you're doing a lot of heavy multitasking, the quad core might be better.
    For intensive games or programs that only use 2 cores, the E8500 will be the better overall choice.

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  4. #4
    SmOgER is offline Junior Member
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    Default Re: Overclocking advice on C2D and C2Q

    This is an old thread and probably irrelevant already, but just in case.

    clock for clock, if cache is similiar, with C2D and C2Q CPUs scalling is easy.

    Q6600 = 2 x E6600

    and in this case:

    Q9400 and E8500 both have 6MB L2, so

    E8500 @ 4.2Ghz = Q9400 @ 2.1Ghz
    Now Q9400 runs stock at 2.66Ghz, so without any overclocking
    you would already have 27% increase in performance coming from E8500.

    Of course I'am not talking about single-threaded performance and shouldn't really matter much,
    but if you want to match it you have to match the clock as there is no turbo boost in these chips.
    Last edited by SmOgER; 07-12-2014 at 05:36 AM.

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    Default Re: Overclocking advice on C2D and C2Q

    AnandTech | Bench - CPU

    "E8500 @ 4.2Ghz = Q9400 @ 2.1Ghz
    Now Q9400 runs stock at 2.66Ghz, so without any overclocking
    you would already have 27% increase in performance coming from E8500"


    Youre kidding ...right?!!
    You cannot do youre cpu math that way,sorry...

  6. #6
    SmOgER is offline Junior Member
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    Default Re: Overclocking advice on C2D and C2Q

    Quote Originally Posted by Norz View Post
    AnandTech | Bench - CPU

    "E8500 @ 4.2Ghz = Q9400 @ 2.1Ghz
    Now Q9400 runs stock at 2.66Ghz, so without any overclocking
    you would already have 27% increase in performance coming from E8500"


    Youre kidding ...right?!!
    You cannot do youre cpu math that way,sorry...
    I'am not kidding.
    And yes, that's the proper way to do CPU math for these chips.
    Single threaded performance doesn't matter anymore as much, cause basically everything has been already optimized to run on multi-core systems.

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