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24GB RAM installed, only 16GB useable?

I recently upgraded from 6GB RAM to 24, the maximum my MoBo will support. When I check in Windows 7 (64 bit), it says 24GB ram installed (16GB useable).

I've unchecked maximum memory in msconfig but it still shows that 8 gigs is not useable. I've heard that sometimes hardware can reserve RAM, but what would be reserving 8GB??
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  1. Best answer
    It's because you are running Home premium, which supports a max of 16gb of ram

    Unfortunately, there is no work around except to upgrade to professional or higher
  2. What version of Windows 7? If it's Home Premium 64-bit, it maxes out at 16GB. Only Professional, Enterprise, and Ultimate 64-bit versions allow more than 16GB of RAM.

    http://msdn.microsoft.com/en-us/library/windows/desktop/aa366778(v=vs.85).aspx#physical_memory_limits_windows_7
  3. Windows 7 Home Premium is limited to 16GB of RAM. Are you running that by any chance?
  4. OK all three of you nailed it, thanks, at least I know now, maybe I'll upgrade to ultimate at some point.
  5. Sadly I can't mark you all as the answerer so I'll just go with the one who got here first :P
  6. Solution to this problem Windows 7 "Ultimate" , assuming the motherboard, the new memory sticks and the Bios are working as it should.

    1- Install the new sticks, turn on the computer and do not touch the Bios (will recognize them automatically, it should 99.99% of the times), just let windows start normally, if so, login as administrator.

    2- go to "control panel" > "System > advanced system settings > advanced > under "Performance" effects, etc click on "Settings" > again click on "advanced" > virtual memory > click on change > and select "no paging file", will ask to restart > click YES > restart and continue last step 3

    3- type under Start command "msconfig" > enter > click "boot" > advanced options > uncheck "Maximun Memory" > ok > apply > restart

    4- if you followed all this steps on sequence from 1-3, now go to control panel > system > you will see your full memory ready to use.

    Note: do not run any memory freeware checking software, will not help at all. Goodbye
  7. James Bateman said:
    I recently upgraded from 6GB RAM to 24, the maximum my MoBo will support. When I check in Windows 7 (64 bit), it says 24GB ram installed (16GB useable).

    I've unchecked maximum memory in msconfig but it still shows that 8 gigs is not useable. I've heard that sometimes hardware can reserve RAM, but what would be reserving 8GB??



    ________________________________________________________________________________________________
    Solution to this problem Windows 7 "Ultimate" , assuming the motherboard, the new memory sticks and the Bios are working as it should.

    1- Install the new sticks, turn on the computer and do not touch the Bios (will recognize them automatically, it should 99.99% of the times), just let windows start normally, if so, login as administrator.

    2- go to "control panel" > "System > advanced system settings > advanced > under "Performance" effects, etc click on "Settings" > again click on "advanced" > virtual memory > click on change > and select "no paging file", will ask to restart > click YES > restart and continue last step 3

    3- type under Start command "msconfig" > enter > click "boot" > advanced options > uncheck "Maximun Memory" > ok > apply > restart

    4- if you followed all this steps on sequence from 1-3, now go to control panel > system > you will see your full memory ready to use.

    Note: do not run any memory freeware checking software, will not help at all. Goodbye
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