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Thread: 16 gigs of ram installed, only 8 usable -- Going crazy! Help!

  1. #1
    kallell is offline Junior Member
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    Default 16 gigs of ram installed, only 8 usable -- Going crazy! Help!

    Alrighty,

    I've already sent out a PM to someone on this board about this, but i don't want to put the sole burden on him -- so i decided to make a public post as well.

    Anyway, i have 16 gigs of ram(4x4gb), but only 8 are usable according to windows.

    Steps i've done so far:
    1-re-seated the ram, changed sticks around
    2-re-seated cpu
    3-verified pins weren't bent
    4-pulled cmos battery
    5-upgraded BIOS
    6-reset BIOS settings
    7-made sure msconfig max ram setting was not set


    The unusual thing I noticed, is that the BIOS (in the DIMM settings) shows all 4 slots filled with 4096 mb of ram, but the next line shows only the first 2 slots as enabled (thus the 8gb usable). CPU-Z reports 16 as well.

    I'm at my wits end here with this.

    Additional info:
    BIOS information is below:
    MIT Status
    DIMM(s) 1 2 3 4
    DIMM Slot (MB) 4096 4096 4096 4096 - -
    Enabled Slot (MB) 4096 4096 - - - -
    Total Memory Size (MB) 8192


    My MOBO -
    Newegg.com - GIGABYTE GA-P55A-UD3 LGA 1156 Intel P55 SATA 6Gb/s USB 3.0 ATX Intel Motherboard

    RAM (4x4gb) - Newegg.com - Patriot Gamer 2 Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model PGD38G1600ELK

    Any ideas?

  2. #2
    Darkje is online now Member
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    Default Re: 16 gigs of ram installed, only 8 usable -- Going crazy! Help!

    Not that it's any help, but cpu-z will determine ramsize by checking the spd-data on the SMbus. This means it can detect ram that is present but not activated.

    For now that is all I can comment, will concider your issue and if I think of something I'll pop back in.

    edit
    ----
    some thoughts:
    - did you buy all 4 at the same time or got one kit later on?
    - do the spd data you can see in cpu-z match for all sticks?
    Last edited by Darkje; 04-06-2012 at 06:35 PM.
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  3. #3
    Chike is offline Senior Member
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    Default Re: 16 gigs of ram installed, only 8 usable -- Going crazy! Help!

    16GB is mac limit for this baord/CPU so you probably need to raise VTT is XMP profile enabled (FFR-1600) or does the memory operate at DDR-1333?
    Try to increase VTT gradually from 1.15v to 1.2v see if that work for you.

  4. #4
    kallell is offline Junior Member
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    Default Re: 16 gigs of ram installed, only 8 usable -- Going crazy! Help!

    Quote Originally Posted by Chike View Post
    16GB is mac limit for this baord/CPU so you probably need to raise VTT is XMP profile enabled (FFR-1600) or does the memory operate at DDR-1333?
    Try to increase VTT gradually from 1.15v to 1.2v see if that work for you.
    I've tried XMP on and off.


    So your suggesting turning that on, then increase VTT?

  5. #5
    Chike is offline Senior Member
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    Default Re: 16 gigs of ram installed, only 8 usable -- Going crazy! Help!

    Yes VTT, it's the IMC and shared cache memory voltage.

  6. #6
    Divenow is offline Junior Member
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    Default Re: 16 gigs of ram installed, only 8 usable -- Going crazy! Help!

    I had similar issue.. 6gb ram, only 4 useable.. Was a bent CPU pin that caused it.. also when i overclocked once it happened too..

  7. #7
    wazza300's Avatar
    wazza300 is offline Sloth Fratelli-Moderator
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    Default Re: 16 gigs of ram installed, only 8 usable -- Going crazy! Help!

    can be a bent pin or not enough qpi/vtt voltage,could be faulty ram module or ram slot but i think you should test with more qpi/vtt,stock is nearly always set too low imo

    16gb is a lot for p55 system too

    EDIT: if i were you id post some pics of the whole cpu socket so we can all have a look for ourselves,youd be suprised howmany folks have said "ive checked cpu socket and its fine" ect and turns out to be three or four pins that are bent
    Last edited by wazza300; 04-07-2012 at 08:12 AM.
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  8. #8
    Bonka is offline Junior Member
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    Default Re: 16 gigs of ram installed, only 8 usable -- Going crazy! Help!

    Also what cooler are you using? There have been instances where a heatsink was overtightened enough to cause the channel to stop detecting occupied RAM slot(s).

  9. #9
    kallell is offline Junior Member
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    Default Re: 16 gigs of ram installed, only 8 usable -- Going crazy! Help!

    Quote Originally Posted by Bonka View Post
    Also what cooler are you using? There have been instances where a heatsink was overtightened enough to cause the channel to stop detecting occupied RAM slot(s).
    Update from the weekend.

    -Took it apart again, combed over the motherboard pins. There was one in the top right corner that was slightly flattened down, i couldn't adjust it since it was a corner. Other than that it looked good.
    -Adjusted the voltages to 1.1, 1.7, 1.9, and 1.21, didn't seem to help. Interesting note on that though was the fact that my BIOS didn't seem to reflect what my easy tuner software said. Not sure which was correct.
    -Played with ram speeds, tried 1300, and 1600.
    -Tried some other ram i had lying around (had another pair of 4gb). It sill only recognized the first two slots; regardless of the arrangement I used.
    -As for my cooler, it's just the stock cooler.

    So far, still only recognizes the first two slots. Right now im leaning towards that one pin screwing everything up, or the mobo is just poop.

  10. #10
    Chike is offline Senior Member
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    Default Re: 16 gigs of ram installed, only 8 usable -- Going crazy! Help!

    Is one module in slots 3 or 4 recognized?
    Are 2 modules in each colore slots pair (! & 3, 2 & 4) recognized.
    If the answer to one of those is no, please do check the pins in memory slots for bent/broken pins.
    You may need also to inspect the CPU socket pins.
    You can take a macro pinture of the DIMMs and/or CPU socket and post it here, make sure there is good light and the picture is clear.

    EDIT: What do you mean BIOS did not reflect what ET said? Did you make the changes in BIOS or ET?

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