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Thread: Can I mix DDR and Dual Channel DDR RAM?

  1. #1
    Raw Wave wizardPC's Avatar
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    Can I mix DDR and Dual Channel DDR RAM?

    Will that work? I just fried my mobo and was planning on getting one with dual channel DDR. Now I have an extra stick of DDR333 with no mobo to put it in (all my other systems have PC133). I'm still gonna put 2 512 sticks of Dual Channel DDR in, just wondering if I should put that single stick in there, too.
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  2. #2
    FLAC Pudge's Avatar
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    Prolly best to check a pc hardware forum for that sorta thing. Well, I'm pretty sure a couple of people here are A+ and might be positive about that, but how about http://www.sharkyextreme.com/

    I have a friend that swears by them, but I dunno they may have an answer if no one here does.

  3. #3
    Newbie Dr Frag's Avatar
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    If you want the memory to work in Dual Channel mode then you must put in sets of two at a time. Either two or four sticks.

    DF

  4. #4
    Maximum Bitrate deadweasel's Avatar
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    Dual channel memory? As far as I know, as long as the board supports it, any standard PC2700 or PC3200 should be able to operate in dual channel mode. At least, I've never had a problem with any of it at our store. Dual channel isn't a function of the memory, it's a function of the chipset.

    For AMDs, the primary chipset for that is the Nvidia NForce2, or NForce3 (although I have yet to test one of our NForce3 systems to see what it can handle).
    For Intel, anything 800mhz front side bus (848p, 865pe, 875) should handle dual channel quite well.

    To maintain a dual channel mode with your memory, the previous poster is quite correct: it needs to be mounted in pairs. Adding another single stick will drop the whole collection back to single. Also, avoid mixing speeds whenever possible. If you have two sticks of PC3200, and add a single stick of PC2700, assuming it will run at all, not only will the system fall back to single channel mode, but will also drop your nice speedy 400mhz PC3200 sticks back to 333mhz! Quite a pinchpoint for data!

    Hope that helps!
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  5. #5
    Raw Wave wizardPC's Avatar
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    thanks guys!
    I'll lose that old stick of DDR, maybe sell it to my roommate
    Debt as of 1/1/05: $34,354.48
    Debt as of July 4, 2007: $0.00 explanation
    I'M DEBT FREE!!
    I'm now a reasonably successful gunblogger.

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