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  1. #1
    Joined
    Oct 2009
    Posts
    86

    Question Windows 8.1 Installed RAM 4GB (3.44 GB usable)

    My question is why is Windows only seeing 3.44GB of RAM when there is 4GB?

    AMD A4-6210 APU
    AMD Radeon R3 GPU
    64-bit OS
    x64 based processor
    Toshiba Satellite.

  2. #2
    Joined
    Feb 2004
    Location
    Janesville, Wi
    Posts
    6,450

    Re: Windows 8.1 Installed RAM 4GB (3.44 GB usable)

    Quote Originally Posted by dreamer77dd View Post
    My question is why is Windows only seeing 3.44GB of RAM when there is 4GB?

    AMD A4-6210 APU
    AMD Radeon R3 GPU
    64-bit OS
    x64 based processor
    Toshiba Satellite.
    My best guess, it is reserving some ram for the GPU


  3. #3
    Joined
    Jun 2001
    Location
    Southern Tier of NY
    Age
    52
    Posts
    21,707

    Re: Windows 8.1 Installed RAM 4GB (3.44 GB usable)

    ^^ That's correct. Since APUs don't have their own dedicated memory they use system memory. 0.5 GB is typically reserved in a 4 GB system. My 8 GB system reserves nearly 1 GB for the APU. I believe the actual amount is configurable in the BIOS.
    If you enjoy gaming click here to learn about the Fragging Frogs.



    [Proudly using only AMD desktop CPUs since 1996 and now also GPUs in 2014 - Thanks AMD!!]
    My Rigs - My Upgrade History - My Games

  4. #4
    Joined
    Oct 2009
    Posts
    86

    Re: Windows 8.1 Installed RAM 4GB (3.44 GB usable)

    Oh, that is something I did not know that a APU would do.
    I would think retrieving information from RAM would be adding latency, no?
    That is why fast RAM helps gives APU's more speed boost in benchmarks?
    Just a theory.

  5. #5
    Joined
    Jun 2001
    Location
    Southern Tier of NY
    Age
    52
    Posts
    21,707

    Re: Windows 8.1 Installed RAM 4GB (3.44 GB usable)

    APU's graphics performance does benefit from faster RAM and running dual channel. Some laptops come with a single stick of RAM which hurts performance. If you game a lot on APU graphics running 2 sticks of RAM in dual channel is worth considering.
    If you enjoy gaming click here to learn about the Fragging Frogs.



    [Proudly using only AMD desktop CPUs since 1996 and now also GPUs in 2014 - Thanks AMD!!]
    My Rigs - My Upgrade History - My Games

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