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? asked in Computers & InternetHardwareAdd-ons · 2 months ago

16 GB Installed RAM and 15.9 GB Total physical memory?

I installed 16 GB of DDR4 RAM onto my PC and I checked my system info right now and it says 16 GB of Installed Physical Memory and 15.9 GB of total physical memory, why is that? Is it the motherboard?

12 Answers

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  • 2 months ago

    That is correct you would experience the same thing if you partitioned a hard drive as well.

  • Ronald
    Lv 7
    2 months ago

    When system boots, it accesses bios and for this it uses ram. Similar to this procedure the rams need a fraction from their storage to get started. That storage is not accessible by other programs, that's why rams show their storage capacity they can use too.. 

  • 2 months ago

    that is the total usable memory, it I like that with my rig also...

  • ?
    Lv 6
    2 months ago

    yes thats correct , a gigabyte = 1,00,000 bytes or 976,5600 kilobytes , yes its correct . your hard drive is measured in gigabytes while your computer runs and measures kilobytes ..simply 1024 = 1 kilobyte.

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  • 2 months ago

    it is just measurement difference.  forget it

  • 2 months ago

    A small amount of the system memory is reserved by hardware for various operations. 

  • Jesus
    Lv 5
    2 months ago

    Each memory chip has a small block that is allocated to the system it contains the information about the chip what size is the chip what configuration is the blocks.

    This information is permanently flashed to the memory.

    It takes up a tiny portion of each stick. So when you install your memory you might have 16 gigs of memory installed but only 15.9 gigs are available to be used the rest of the memory contains the permanently flashed information that makes the memory chips recognized by the system.

    This same thing is often seen in hard drives you might have a 500 gig hard drive. But when you install it you will see that only 496 gigs are available!  For the same reason the hard drive has permanently flashed information embedded in it. 

    If for some reason that information gets erased or corrupted on either the RAM chips or the hard drive then you run into a big problem.

    Neither your hard drive or your RAM chip will get recognized by the BIOS.   Having built up static in your hand when you install the ram can do this.

    This is the reason that you are supposed to either wear a wrist strap grounding you to the chassis of the computer.

    Or keep your hand touching the metal while you're installing the ram chip. Always unplug it always hold in the power button to discharge any voltage that is still left in the power supply. Before you install ram or a hard drive

  • 2 months ago

    Thats normal. Basically ever PC spec is an aproximation or incorrectly converted or has a system reserve.

  • ?
    Lv 7
    2 months ago

    Some functions of the Operating System Reserve some RAM, Like the Swap File.

  • keerok
    Lv 7
    2 months ago

    One, the motherboard may be using part of RAM for something else and two, the computation of GB is sketchy at best (it's not exactly 1 million). You have 15.9GB. That's very close to 16 which is a lot! You won't miss that .1.

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