Memory speed confusion - Intel Core 2 Duo E8400 LGA775 'Wolfdale' 3.00GHz (1333FSB)

Discussion in 'Hardware' started by noesis, 14 Mar 2008.

  1. noesis

    noesis What's a Dremel?

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    Hi

    I am think about buying a processor as part of this system: http://forums.bit-tech.net/showthread.php?p=1687415#post1687415

    It the Intel Core 2 Duo E8400 LGA775 'Wolfdale' 3.00GHz (1333FSB):
    http://www.overclockers.co.uk/showproduct.php?prodid=CP-192-IN

    However, I do not understand the FSB speed of 1333 MHz. There do not seem to be many memory modules out there that run at his speed, e.g.:

    http://www.ebuyer.com/product/130430

    and they cost more than the processor!

    I looked into getting the next FSB down. It seems that there is a huge jump! The next lowest Core 2 Duo FSB speed was 800 MHz. I am confused.

    I plan to get a dual core because most games do not support quad yet. Would I be better off getting a quad core and slower memory?

    Please help! I am lost :lol:

    Thanks
     
  2. Cosmos

    Cosmos What's a Dremel?

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  3. badders

    badders Neuken in de Keuken

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    The processor FSB (1333) is Quad Pumped. The "real" front side bus is only running at 333MHz.
    RAM speeds are Double Pumped. So to run at a FSB of 1333 (333) you need RAM that is capable of 666MHz operation.

    You can go 800 or 1066 RAM if you need the headroom for overclocking.
     
  4. cpemma

    cpemma Ecky thump

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    See this thread (though it only repeats what badders said). :)

    The processor runs stock, 333MHz system bus x 9 multiplier = 3GHz, DDR2-667 OK (just).

    To overclock up to 3.6GHz you'd use up to 400MHz system bus and need DDR2-800

    To go any higher you'd need DDR2-1066
     
    Last edited: 14 Mar 2008
  5. lamboman

    lamboman What's a Dremel?

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    As that says. But, that is if you don't want to buy enthusiast memory. Ballistix, for instance, are amazing overclockers, plenty for any processor out there.
     
  6. cpemma

    cpemma Ecky thump

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    Should add that with faster memory fitted an Intel board will auto-set a memory multiplier higher than 1:1 to suit the memory fitted, so DDR2-800 will get 333 x 2.4 = 799. A small advantage in real life, but it may give better benchmarks. ;)

    When overclocking the system bus (especially by a large amount) you need to remember to turn that multiplier down. :duh:
     

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