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Thread: GA-P55-UD3R 2x2 Gb




  1. #1
    Join Date
    Sep 2009
    Posts
    10

    Default GA-P55-UD3R 2x2 Gb

    Hi

    So, recently, I bought 2x2Gb DDR3 RAM (1333 MHz) from Corsair, and inserted them on my GA-P55-UD3R motherboard. I placed them in dual-channel mode in the white slots (1-3) and everything loaded fine. But when I check in the M.I.T. in the bios, it shows me 2Gb memory in slot 1 and 2 Gb in slot 3, but on the total of both it only shows that 2Gb is working. All slots work fine, same for the RAM as I changed the places many times, but still only 2Gb are being used.

    Same when I log into Windows 7: Shows 4 Gb but only 2Gb usabled (even tho there is no memory limitation).

    Anyone already had this problem before or know how to solve it please?

    Thank you!

  2. #2
    Join Date
    Sep 2008
    Location
    St. Louis, MO
    Posts
    112

    Default Re: GA-P55-UD3R 2x2 Gb

    Where is it showing only 2gb usable? Same mb, 2x2 on the ram, under system in Windows 7 it shows 4gb. Using the latest bios also.
    I7 - 2600K
    Gigabyte Z77X-UD3H (bios F20e mod)
    G.SKILL Ripjaws Z Series 16GB (4 x 4GB)
    Sapphire 7970
    ASUS XONAR DX
    Windows 8.1 64 bit

  3. #3
    Join Date
    Sep 2009
    Posts
    10

    Default Re: GA-P55-UD3R 2x2 Gb

    Thank you for your response.

    Well, it shows only 2 Gb usable, but 4 in total when I look in computer propwerties, thus giving me a crappy score of 5.5. Also, I looked for the RAM limitation in the msi config, and there is no.

    Anyway, I doubt the problem is the OS as the BIOS detects it wrong before loading it. It shows me 2 Gb on each slot, but on the total theres a (-) under slot 3 and 2 Gb under slot 1... I also downloaded the latest BIOS, changed nothing...

  4. #4
    Join Date
    Sep 2009
    Posts
    10

    Default Re: GA-P55-UD3R 2x2 Gb

    Wow, it's SO nice to see that a support forum don't even mind helping people who actually need support. Good job guys, wow...

  5. #5
    Join Date
    Oct 2009
    Posts
    33

    Default Re: GA-P55-UD3R 2x2 Gb

    You ever figure this out? I'm having the exact same problem with the motherboard, except I've got 4 2gb (G.Skill F3-10666) sticks in there and it's only seeing 4 total.
    Last edited by MeatballCB; 10-11-2009 at 04:45 AM.

  6. #6
    Join Date
    Nov 2008
    Location
    nyc
    Posts
    17

    Default Re: GA-P55-UD3R 2x2 Gb

    Did you adjust the memory voltage?

  7. #7
    Join Date
    Sep 2009
    Posts
    10

    Default Re: GA-P55-UD3R 2x2 Gb

    Thank you for your answer.

    No, I didn't change any settings for the memory voltage. Do I need to? I will try to take a picture of the bios ASAP to show you the default settings actually on.

    I really need these 2Gb more because my system is only using 1.14 Gb because of the graphic card actually.

    Thank you for your help.

  8. #8
    Join Date
    Nov 2008
    Location
    nyc
    Posts
    17

    Default Re: GA-P55-UD3R 2x2 Gb

    You might... Try and set the memory voltage to whatever the Memory manufacturer sets as the max voltage.....as long as you don't go past 1.65/1.66v Cpu safety limit.

    I'm stable on the same board with 4x2gb 1600@1.66v
    Cpu i7 860 Turboboost off, 19x201 for 3.81ghz, Cores hit 78C linx 50 runs

  9. #9
    Join Date
    Oct 2009
    Posts
    33

    Default Re: GA-P55-UD3R 2x2 Gb

    Yeah, I tried adjusting the memory voltage up to 1.6v (memory I have says it needs 1.5 - 1.6 v) and still showing up with half the memory usable.

    What's weird in my case, Windows 7 is reporting 8 GB of system memory but on 4 GB of usable memory.

  10. #10
    Join Date
    Nov 2008
    Location
    nyc
    Posts
    17

    Default Re: GA-P55-UD3R 2x2 Gb

    Did you try slots 2&4? Probably need to RMA the mainboard...maybe a bad trace somewhere. Even if it worked in slots 2&4 I'd RMA it...somethings wrong... Try to manually set the timings on the ram?

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