Windows 8 and 8.1 Forums


Ram 16 GB ( 11.5 GB Usable ) ? 4.5 GB Hardware reserved

  1. #1


    Posts : 2
    Windows 8

    Ram 16 GB ( 11.5 GB Usable ) ? 4.5 GB Hardware reserved


    Hi guys

    My question is why Windows 8 did take 4.5 GB for hardware only ,,, is that too much ?
    My windows 8 is Single Language edition ... The original one that comes with the laptop
    I tried to install Pro edition trail version it says 16 GB ( 15.5 GB Usable)


    System Manufacturer/Model Number
    MSI GX60 1AC
    OS
    Windows 8
    CPU
    AMD A10-4600M APU with Radeon(tm) HD Graphics, 2300 Mhz, 4 Core(s), 4 Logical Processor(s)
    Memory
    16 GB Installed
    Graphics Card(s)
    AMD Radeon HD 7660G & ATI Radeon HD 7970M
    Attached Thumbnails Attached Thumbnails HW.JPG  
    Last edited by BlackStab; 24 Mar 2013 at 14:08.

      My System SpecsSystem Spec

  2. #2


    Hello BlackStab,

    From my experience, hardware reserved RAM is somehow connected to the physical memory on your graphics card. So, the more you have on the card, the more RAM will be hardware reserved. Why? I think it has something to do with memory mapping but I'm not equipped to explain that to you (or myself). Anyway, if you have 3GBs of physical memory on your graphics card, then I'm thinking that might be normal; however, if I am incorrect in any way, shape or form, an expert will be along shortly to tear me a new... uh, I mean... will be along shortly to properly assist you.

    Now, another thing that could cause a large amount of RAM to be hardware reserved would be an invalid memory configuration. This could occur when one uses double-sided chips in a mobo where only single-sided chips can be addressed. In this case, although it can be recognized, it cannot be addressed, so it is essentially "set aside." Also, a well know example of hardware reservation (in action) would be where you install 4GBs of memory for a 32 bit OS and only 3.xx GBS are usable. This is a different situation from the first example; however, the results are the same. So, in summary, if you don't get a different response from a forum expert and I don't get bashed... I mean corrected for mine, then you can assume you are OK!

    Cheers
      My System SpecsSystem Spec

  3. #3


    I have a couple of desktops running Win8 Pro X64. Both of them have 16GB of RAM. Both report 16GB in the System control panel. (Nothing about "usable" RAM.) One system has a 2GB graphics card; the other, 3GB.

    I think that the graphics card issue applies to 32 bit Windows: something to do with an address space limitation. AFAIK, it's not relevant to X64.

    I have no explanation for the unavailable 4.5GB. Seems large enough for a RAM disk. Does the laptop seem to have a mysterious 4.5GB hard drive in Computer?
      My System SpecsSystem Spec


  4. #4


    hey bobkn,

    Would you be so kind to shows us your system specs for the desktops in question and please show us that screenshot that reports 16GB and reports nothing about usable (meaning all 16GBs are usable with absolutely nothing reserved). Also, please make sure to identify those 2 graphics cards that have 2GB and 3GBs respectively.
      My System SpecsSystem Spec

  5. #5


    One system is in my system specs. The GTX680 is a 2GB version. See the attached screenshot.

    Click image for larger version

    The second system uses a Radeon HD 7970 (3GB) on an Asus P8Z68-V Pro motherboard.

    Click image for larger version

    Both graphics cards have the least standard VRAM available. Anymore questions?
      My System SpecsSystem Spec

  6. #6


    At first the graphic cards were used just when we play play a 3D or high graphics game. Windows 8 has evolved using graphics card with its hardware resources and thus making laptops work faster and in efficient mode. It just uses the parallel computing to make a good use of physical memory.
    Also windows keeps some reserved physical ram for windows processes thus no worry about usable ram windows manages it automatically.
      My System SpecsSystem Spec

  7. #7


    Hi bobkn,

    OK, I think your screenshot has proven my first assumption to be incorrect so you have a REP forthcoming for that; however, can you show me this screenshot on one of your PCs please. I'm specifically interested in you "shared memory allocation" and, based on what I think your logic is, there should be none on your PC. However, if you do have some shared memory, can you please give your thoughts on what you think it is used for? Thanks again!

    Click image for larger version

    Oh, and I guess that leaves the OPs memory issue still up in the air; however, I read his post again and I noticed that when he tried Win 8 Pro trial, it report 15.5GB usable so, if I read that correctly, the only difference would be the OS; yes? God luck in finding that one!
    Last edited by norepli; 25 Mar 2013 at 14:15.
      My System SpecsSystem Spec

  8. #8


    Posts : 2
    Windows 8


    Thanks guys for replies ...
    sorry for less detailed specifications of my laptop
    My laptop is MSI GX60 with A10-4600 and have two GPUs ( ATI 7660G with 512MB & ATI 7970 with 2GB )
    Thanks to
    norepli I found the detailed spec. of my GPUs and it appears that it shares 5000 MB with ram, so the total is 8 GB ....
    I was scared that 4.5 GB are not addressed, but it appears that the GPU uses it.

    Thanks guys
    Attached Thumbnails Attached Thumbnails HW.JPG  
      My System SpecsSystem Spec

  9. #9


    Quote Originally Posted by BlackStab View Post
    Thanks guys for replies ...
    sorry for less detailed specifications of my laptop
    My laptop is MSI GX60 with A10-4600 and have two GPUs ( ATI 7660G with 512MB & ATI 7970 with 2GB )
    Thanks to
    norepli I found the detailed spec. of my GPUs and it appears that it shares 5000 MB with ram, so the total is 8 GB ....
    I was scared that 4.5 GB are not addressed, but it appears that the GPU uses it.

    Thanks guys
    Hey bobkn!

    How about them apples; eh?

    AND... You are welcome BlackStab! Glad you feel (somewhat) comfortable now.
      My System SpecsSystem Spec

  10. #10


    I was scared that 4.5 GB are not addressed, but it appears that the GPU uses it.
    Yes ! Dont be afraid.

    The RAM usage priority is for the system. If the system run out of resources some of the shared RAM will be liberated.

      My System SpecsSystem Spec

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