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DDR333 and DDR400 Together

By premsmp
Jun 1, 2009
  1. Dear,
    My Motherboard is MSI 6566 E - Chip set intel 845E Max (Max memory alowable is 2Gb)
    I want to upgrade my memory module to 1Gb,
    Motherboard specification said that it is compatible with DDR 333 or DDR 400
    I already have 256Mb DDR pc 333,

    i want to upgrade it to 1Gb but DDr333 not available ,only available one is DDR400
    can i use 1Gb DDR400 and 256Mb DDR 333 together
    If it is not what will be better,

    1. Two 512Mb DDR400 or
    2. One 1Gb DDR400
    Pls be Kind enough to answere
  2. captaincranky

    captaincranky TechSpot Addict Posts: 12,761   +2,432

    Usually, yes. The total memory will then run at the speed of the slower modules. The machine I'm using right now has DDR333 and DDR400 (Intel 915GAG), and it runs just fine. (mixed brands too, but all are generic types)

    One caution make sure these are "generic" modules. (standard spec, run of the mill DIMMs). the trouble usually starts when you mix high performance and generic types. The timing and voltages can be different, which is much more critical than the speed.
  3. Tedster

    Tedster Techspot old timer..... Posts: 6,000   +15

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