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Mixed RAM Sizes

Discussion in 'Electronic Design' started by Jim Thompson, Jan 31, 2007.

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  1. Jim Thompson

    Jim Thompson Guest

    Probably a dumb question, but...

    In one of my PC's I have two 512MB sticks, and two empty slots.

    I have some 256MB sticks of the same speed rating.

    Can I place these in slots 3 & 4, or do all 4 slots have to use the
    same size?

    ...Jim Thompson
  2. Joel Kolstad

    Joel Kolstad Guest

    In general you can mix and match sizes.

    Specific motherboards will occasionally balk at this, but you really are
    *supposed* to be able to do it. Try it out!

    There are also various specific (crap) motherboards that don't reliably
    support having memory in all four sockets. This has probably been all
    hammered out by now, but I a motherboard in years past where they actually
    went back and put stickers over the 4th socket telling you not to use it,
    since electrically the loading had become large enough that the signal
    integrity became marginal.
  3. GM

    GM Guest

    In a HP desktop machine that I used at work (if I remember well) there were
    4 slots divided into 2 groups. The memory sticks belonging to the same
    group should be of equal size.
    You should better look up the manual of your PC motherboard


  4. Do you have the manual for the motherboard? If not, then download
    Belarc "Advisor" to see the brand and model number so you can look for
    it online:

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  5. default

    default Guest

    You probably can. There should be documentation with the motherboard
    that spells out how to do it. Where there are restrictions, they
    usually want the bigger sizes in the lower number slots.
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