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Memory 16 GB (8 GB usable)

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  • Memory 16 GB (8 GB usable)

    Recently built a ASUS P7P55D-E system with 8 GB total of [ Ripjaws ] F3-12800CL7D-8GBRH (4Gx2) memory. Today have added 2 more DIMMS of the same memory to get to 16 GB total, now have 4 DIMMS to fill all 4 mobo slots.

    system recognizes the 16GB but shows 'Installed memory (RAM): 16.0 GB (8.00 GB usable)'
    CPU-Z recognizes all 16 GB of memory. Memory is set at 1600 Mhz 7-8-7-24 at 1.6v
    Bios shows max memory at 8GB. The Bios is up to date with version 1101.

    any clues??

    any help is much appreciated, thanx

  • #2
    If you could post your BIOS settings we'll take a look - also may try disabling the USB 3 in the BIOS, have been reports of it messing with the mobo seeing DRAM


    Pls offer comments on support I provide, HERE, in order to help me do a better job here:

    Tman

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    • #3
      Originally posted by Tradesman View Post
      If you could post your BIOS settings we'll take a look - also may try disabling the USB 3 in the BIOS, have been reports of it messing with the mobo seeing DRAM
      disabled USB 3

      I'm a bit of a noob with the Bios stuff, so here's some info, if you need other settings, let me know.

      ***CPU Settings***
      Module Version :01.0A
      Intel
      Brand String: i7CPU k 875@
      2.93GHz
      Freq: 2.93GHz
      BCLK Sped: 1.37MHz
      Cache L1: 256 KB
      Cache L2: 1024 KB
      Cache L3: 8192 KB

      Ratio Status: (Min:09, Max:63)
      Ratio Actual: 22
      CPUID: 106E5

      ***AI Tweak***
      CPU Core Voltage: 1.120v
      IMC Volatage: 1.15v
      DRAM Voltage: 1.596v
      CPU PLL Voltage: 1.787v
      PCH Voltage: 1.043v

      Target CPU Freq: 2926MHz
      Target DRAM Freq: 1600MHZ

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      • #4
        Some Luck...

        I swapped the new DIMMS into A1/B1 and the old ones into A2/B2. Rebooted and now shows Installed memory 16GB (15.2 usable). re-enabled USB 3 and still 15.2.

        does that make sense then? am I all good? or should it say 16GB usable?
        Last edited by tcampbell; 01-07-2011, 09:09 PM.

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        • #5
          15.2 showing where? if that's what it's showing in Windows, it may be redirecting some to your GPU (or possibly elsewhere)....could take IMC voltage up just a tad (1.2) and same w/ PLL (1.2)


          Pls offer comments on support I provide, HERE, in order to help me do a better job here:

          Tman

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          • #6
            in the windows 7 system properties. "Installed memory (RAM): 16.0GB (15.2 GB usable)"
            thought 15.2 it was a bit strange.

            Adobe After Effects shows the 15.2 now as well which I guess is good, thats one one the main reasons I went to 16.

            I have the ATI 5970 with the 2 GPU's installed. I didn't know that was even possible that RAM could be directed to the GPU.

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            • #7
              Yes, systems have been delegating DRAM to the GPU forever - to check what is being used - go to start -
              and type in DXDIAG tell it yes and then in the menu select display 1 and it will tell you appr how much DRAM (on-board and borrowed you have available


              Pls offer comments on support I provide, HERE, in order to help me do a better job here:

              Tman

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              • #8
                it say 716MB in the DXDIAG. I guess thats probably it huh. I'll up the voltage a bit like you suggested.

                thanx for your thoughts and suggestions.

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                • #9
                  No problem, enjoy and have a good one


                  Pls offer comments on support I provide, HERE, in order to help me do a better job here:

                  Tman

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