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Dell optiplex 400 manual

Hello,my friend has a Dell Optiplex 400 with a Pentium 4 processor, what kind of ram and how much of it will his system support. He's running Win XP
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    Hi newcomer and welcome to the Tom's hardware forum.

    See answer here

    P.D. The next time that you need a manual, you can try THIS
  2. Best answer selected by xalcorn.
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