EVGA SR2 showing only 32Gbytes RAM instead of 48Gbytes

Posted on 2012-08-19
Last Modified: 2012-09-25
I just installed 24 Gbytes of extra memory to my existing 24G on my SR 2 mobo.  When I boot up the machine its only shows 32 Gbytes when showing installed memory.  I'm using the same memory modules Patriot MEM 4Gx3|PATRIOT PS312G13ER3K-E RT.
I checked with AIDA64 and the memory modules were identified.  I have a dual Intel Xeon X5680 system with no overclocking.
Please help.
Question by:geocleojohn
    LVL 20

    Expert Comment

    Please see the MB manual, page 21 and ensure you have followed the manufacturer's requirements for DIMM placement:

    It looks like they must go into specific slots.

    Author Comment

    Yes, It's fully populated with 12 DIMMS 48Gbytes.
    LVL 55

    Expert Comment

    Make sure you do not have it in redundant memory, mirrored memory or lock-step memory mode (set in BIOS). Redundant is similar to RAID 5, mirrored mirrors channels 1 and 2 with channel 3 disabled, lock-step reads/writes channels 1 and 2 simultaneously for extra ECC and disables channel 3.

    N.B. your manufacturer may use slightly different terms, but you want it in independant mode.

    Accepted Solution

    It was the same DIMMS part number but different year of manufacturing.  Patriot recommended I exchange them with recent mfg dates similar to ones I bought and now all working well.  Thanks for the help!

    Author Closing Comment

    Its memory issue , not board issue.

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