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8GB, but only 3.25 usable?

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Hello,
.
I recently upgraded my memory from 4GB to 8GB
but I have a big problem because Windows shows the 8GB, but informs me that only 3.25GB is usable...
.
If any of you can tell me how to make the 8GB usable, that would be really nice.
.
-I'm using Windows 7 64-bit
- Motherboard: Asustek M4A77TD PRO
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Here is a screenshot: http://hpics.li/b3c17f7
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Thanks in advance for your responses.
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Configuration: Windows 7 / Chrome 45.0.2454.99

1 answer

  1.
    Buenos74 Posted messages 5252 Registration date   Status Member Last intervention   848
     
    Hi,

    Full specifications of RAM sticks please...

    --
    "I am the Lizard King............... I can do everything"
    Jim Morrison (RIP)
    4
    1. exiled
       
      Hello Buenos,
      . Kingston HyperX FURY Red - 8GB (2x4GB) DDR3 1333 MHz
      0
    2. Judge_DT Posted messages 27651 Registration date   Status Moderator Last intervention   10 013 > exiled
       
      Hello,

      In the BIOS, how many GB are detected and what does it say about the memory installed on the PC?

      We can also check something else: Windows + R -> 
      msconfig
      and press Enter, then look in "Startup" and the advanced system options, to make sure that "maximum memory" is not enabled.
      1