Memory Size Reporting

Hello,

I'm running and Asus M4A785TD-V EVO with 4GB memory in 2 sticks (Corsair TW3X4G1333C9A). I'm currently trying to test my memory to sort out a crashing problem I've been having.

In the middle of trying different slotting configurations the intermittant faults I was trying to trace seem to have stopped, _but_ MemTest86+ and Windows Resource Monitor are reporting 256M less memory than expected (each stick individually is showing 1792M and both together 3840M). On balance this doesn't look good to me, but I wanted to get another opinion. Is there a possible explanation for this?
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  1. Welcome to Tom's Forums! :)

    Corsair Tested - http://www.corsair.com/configurator/product_results.aspx?id=1364994 -> OK {TW3X4G1333C9A} is indeed listed.

    REF M4A785TD-V EVO http://usa.asus.com/product.aspx?P_ID=fcsXWSxnhzZE9rnR

    Q - What CPU?
    Q - What DIMM Slots are you using?
    Q - What BIOS version?
    Q - What BIOS settings are you using for the Memory settings?
    Q - What OS AND type {32/64-bit}

    I need all (5) questions answered.

    Also, post the following {windows 7}:
  2. Hi jaquith, thanks for the help:

    Q - What CPU?
    Phenom II X2 550

    Q - What DIMM Slots are you using?
    A1 and B1

    Q - What BIOS version?
    2105

    Q - What BIOS settings are you using for the Memory settings?
    Memory Timing and Voltage are set to Auto
    Bank Interleaving - Auto
    Channel Interleaving - XOR or Address bit
    Enable Clock to All DIMMS - Disabled
    MemClk Tristate C3/ATLVID - Disabled
    Memory Hole Remapping - Enabled
    DCT Unganged Mode - Always
    Power Down Enable - Disabled

    Q - What OS AND type {32/64-bit}
    Windows 7 Home Premium 64-bit

    http://img831.imageshack.us/img831/5792/capturenu.jpg
  3. The reason I asked for the BIOS version + CPU; Verify correct BIOS per CPU and pertinent BIOS fixes = good

    Obviously DIMM slots to verify CPU: | A2 | B2 | A1 | B1 | ; Verify correct slots Dual Channel = good

    Windows OS as stated above = good.

    The Integrated ATI Radeon HD 4200 GPU seems to be using 256MB or 0.25GB RAM {H/W reserved = 258 MB total} The memory can be adjusted up to 512MB or 0.5GB, and the can be OC to 1000 MHz {default = 500 MHz}. However, I did not see in the manual a way to disable it IF you have a dedicated GPU; in general it 'might' be listed in the 'Onboard Devices Configuration' ; otherwise the onboard GPU can be disabled via the Device Manager.

    BIOS:
    Memory Timing and Voltage are set to Auto ; good
    Bank Interleaving - Auto ; good
    Channel Interleaving - XOR or Address bit
    Enable Clock to All DIMMS - Disabled ; good
    MemClk Tristate C3/ATLVID - Disabled ; good
    Memory Hole Remapping - Enabled ; good

    DCT Unganged Mode - Always ; -----> if there's an instability then change

    Power Down Enable - Disabled ; good

    I look at everything that you posted, and clearly the ANS is your Integrated ATI Radeon HD 4200 which 'shares' your DDR3 RAM.

    Do you have a dedicated GPU?
  4. jaquith said:
    I look at everything that you posted, and clearly the ANS is your Integrated ATI Radeon HD 4200 which 'shares' your DDR3 RAM.

    Do you have a dedicated GPU?

    Oops. Yes I do have a seperate GPU which I unplugged while I was testing. Of course your right about the onboard video, I really should have seen that one myself. Reconnected the graphics card and I'm back to normal. :whistle:

    Thank you for your time and your help. :)

    jaquith said:
    DCT Unganged Mode - Always ; -----> if there's an instability then change

    Thank you for this particularly. I'll look into it.
  5. Quote:
    Hello,

    I'm running and Asus M4A785TD-V EVO with 4GB memory in 2 sticks (Corsair TW3X4G1333C9A). I'm currently trying to test my memory to sort out a crashing problem I've been having.

    In the middle of trying different slotting configurations the intermittant faults I was trying to trace seem to have stopped, _but_ MemTest86+ and Windows Resource Monitor are reporting 256M less memory than expected (each stick individually is showing 1792M and both together 3840M). On balance this doesn't look good to me, but I wanted to get another opinion. Is there a possible explanation for this?


    I have that same board with 4GB of ram, but it reports 3830MB as some of it is hardware reserved (onboard VGA etc). As Angharan1971 linked
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