DDR333 Performance RAM for Dothan Laptops?

Discussion in 'Hardware Components and Aftermarket Upgrades' started by JPratt, Nov 6, 2004.

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  1. JPratt

    JPratt Newbie

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    I'm ordering an ASUS notebook (model M6N w 855PM chipset) soon with Dothan processor. I'm thinking of ordering Cosair "XMS" PC2700 RAM (200 pin SODIMM) to put in this notebook. Cosair claims this RAM will run at lower latency than generic RAM. Has anyone used it? Does it make any tangible difference in terms of performance?

    Also undestand the DDR400 RAM is backward compatible with DDR333, is this correct and is there any benefit (or penalty) in using DDR400 with the Intel 855PM chipset.
     
  2. bootleg2go

    bootleg2go Notebook Deity NBR Reviewer

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    The lower the CAS latency the better, however don't go by them saying that thier latency is lower than generic as that is not always so. You need to look at the CAS latency spec on each module as sometimes name brand stuff is not that great and generic can beat it. Usually the very cheap ram, like when your shopping for the lowest price will get you lousy latency. You usually get what you pay for, but read the specs before buying. Using DDR400 won't hurt you any, but it usually costs a little more and if the motherboard uses DDR333, using DDR400 won't help performance at all.

    Jack

    "They who would give up an essential liberty for temporary security, deserve neither liberty or security" (Ben Franklin)
    http://pbase.com/joneill
     
  3. JPratt

    JPratt Newbie

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    The DDR33 Corsair XMS is CAS 2. Most other DDR333 is Cas 2.5. Some DDR400 is CAS 3. So I guess that is one reason not to use DDR400 even though it is compatible.




     
  4. highlandsun

    highlandsun Notebook Evangelist

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    DDR400 compatibility is dicy at best. Some will work, some won't.
    DDR400 CAS3 is still faster than DDR333 CAS2.5, the latency numbers are quoted in clock cycles and 400MHz clocks are obviously faster than 333MHz clocks.



    old: Sony PCG-GR300P 1.13GHz PIII-M, 512MB
    new: Asus M6Ne 2.00GHz P-M, 2GB
     
  5. bootleg2go

    bootleg2go Notebook Deity NBR Reviewer

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    <blockquote id='quote'>quote:<hr height='1' noshade id='quote'>Originally posted by highlandsun

     
    Last edited by a moderator: May 8, 2015
  6. highlandsun

    highlandsun Notebook Evangelist

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    Ah yes, quite right. I meant to compare CAS 2.5 DDR400 (6.25ns)...

    old: Sony PCG-GR300P 1.13GHz PIII-M, 512MB
    new: Asus M6Ne 2.00GHz P-M, 2GB
     
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