6 GB ( 4GB Usable) -- What??

Why does my computer --> properties -- say I only have 4 GB usable??

64 bit OS W7 professional
7 answers Last reply
More about usable what
  1. Check for bent motherboard pins.
  2. Which motherboard are you using and what kind of memory setup (3x2gb eg.) ?

    Does your BIOS recognize all of the 6 GBs of memory at boot? If not try reseating your memory sticks, or try different slots if you can.

    If this is a Windows only problem you might want to check Control Panel -> System and Security -> Administrative Tools -> System Configuration, select the boot tab and advanced options. If the maximum memory is set to 4GB there disable the memory limitation option there.
  3. It seems to recognize it --

    it says Installed memory (RAM): 6.00GB (4.00 GB usable)

    3x2 GB

    mobo is MB GIGABYTE GA-EX58-UD4P 1366 X58 R
    mem is MEM 2Gx3|OCZ OCZ3G1600LV6GK R
  4. Could be bent pins then like Lmeow said. A link here that should illustrate what we mean:


    Also there is a small guide concerning this in toms forums. Here's some advice borrowed from that guide.

    If you have 'X' amount of memory installed, and either the BIOS, or Windoze is only showing 'Y' amount available, the very first thing to do is: pull your CPU, get a flashlight & magnifying glass, and check your socket for bent or distorted pins:

    Nineteen times out of twenty, you will find 'em! Excellent pictorial guide to installation/examination from Intel.
    ...if the pins are not too badly mangled, they can often be 'teased' back into place, using:
    a jeweler's tweezer (most large hobby shops)
    a jeweler's screwdriver (any dollar store)
    a dental pick/tool (often found at dollar stores or hardware store counters)
    a 'pin-vise' with a sewing needle mounted in it (a 'pin-vise' is a little thing the size and shape of a kid's crayon, that has a tiny chuck at one end, much like a drill chuck - they are used to drill ultra-fine holes in small work, and can be found, again, at any large hobby-shop or hardware store...)
    ...just takes a steady hand, and a bunch of patience
  5. Thanks for the pin bending ref. I might have to do that.

    I pulled all three of my ram sticks out and tested each one individually. With one of them, the computer would not start up. The other two worked fine and reported 2 GB.

    What do I do from here? It is MEM 2Gx3|OCZ OCZ3G1600LV6GK R. Can I get a single stick replaced somehow?
  6. All of a sudden it is working??

    Installed memory 6.00GB RAM

    hmm weird. Well I guess I don't need to RMA it anymore.
  7. Run a memory test; might have a bad stick that kinda-sorta works.
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