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Memory not recognized by BIOS ...

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  • Memory not recognized by BIOS ...

    G.Skill RAM I purchased: http://www.gskill.com/en/product/f3-1600c11d-16gnt
    Computer RAM specs (pg. 78 & 79): http://h10032.www1.hp.com/ctg/Manual/c04497146

    Hi everyone,

    I have an HP EliteDesk 705 G1 SFF, originally installed with a total of 8GB of RAM (2 sticks of 4GB each, 1Rx8 PC3L-12800U-11-13-A1 DDR3L-1600, HP-branded Hynix memory, HP p/n 698650-154). I purchased an additional 16GB of Gskill RAM (2 sticks of 8GB each, DDR3-1600, PC3-12800), with the idea of upping it to a total of 24GB of RAM.

    I installed the two new 8GB sticks into the two empty slots and the BIOS recognized 12GB (one of the 8GB sticks, one 4GB stick)! I rearranged the sticks in every possible way & combination in the four slots and sometimes only 8GB would be recognized, sometimes 12GB, sometimes 16GB, but never all 24GB.

    If I install the following, the BIOS recognizes 16GB of memory, and thinks DIMM1 is empty:
    DIMM1 - Gskill 8GB
    DIMM2 - Gskill 8GB #2
    DIMM3 - HP's (Hynix) 4GB
    DIMM4 - HP's (Hynix) 4GB

    If I remove the Gskill RAM and leave it in the default configuration as it came new the BIOS recognizes 8GB of memory:
    DIMM1 - HP's 4GB
    DIMM2 - Empty
    DIMM3 - HP's 4GB
    DIMM4 - Empty

    If I install the memory like this, BIOS sees only a total of 8192MB (DIMM3 populated, and DIMM1 empty):
    DIMM1 - Gskill 8GB #1
    DIMM2 - Empty
    DIMM3 - Gskill 8GB #2
    DIMM4 - Empty

    If I swap the RAM like this, BIOS still only sees a total of 8192MB (DIMM3 populated, and DIMM1 empty):
    DIMM1 - Gskill 8GB #2
    DIMM2 - Empty
    DIMM3 - Gskill 8GB #1
    DIMM4 - Empty

    In this configuration, the UEFI BIOS only sees 8GB of memory, and thinks DIMM1, 3, and 4 are empty:
    DIMM1 - HP's 4GB
    DIMM2 - Gskill 8GB
    DIMM3 - HP's 4GB
    DIMM4 - Gskill 8GB

    Right now I have them installed like this (below), and the UEFI BIOS thinks DIMM1 & DIMM2 are empty; it reports 24GB in the first two seconds on POST, then the 24GB changes to 12GB:
    DIMM1 - Gskill 8GB
    DIMM2 - HP's 4GB
    DIMM3 - Gskill 8GB
    DIMM4 - HP's 4GB

    With this last configuration, I notice this: when I startup the computer, the POST screen shows this for a moment:

    Copyright (c) 2014 Hewlett-Packard Development Company L.P.
    Version 2.16.1240. Copyright (C) 2013 American Megatrends, Inc.
    24576 MB

    ... then, about two seconds later, the "24576 MB" changes to 12288 MB and shows this:

    Copyright (c) 2014 Hewlett-Packard Development Company L.P.
    Version 2.16.1240. Copyright (C) 2013 American Megatrends, Inc.
    12288 MB

    I know that all four sticks of RAM are operational since I can plug them in one at a time without the others and the computer reports the correct amount installed. MemTest86 recognizes 24GB of RAM and tests it all from 0 to 0x63F000000 without reporting any errors. The G.Skill RAM modules I purchased conforms to what the owner's manual specifies and requires. The BIOS was updated to the latest version available from HP's site - version 2.30 Rev A (L06) from March 28, 2018. The CMOS was also reset without change.

    Windows reports that it sees 24GB of RAM, and so does other Windows-based utilities (Speccy, CPU-Z, AMD's Overdrive Utility, etc.). The BIOS reports 24GB then changes its mind to 12GB. HP's PC Hardware Diagnostics also only reports 12GB.

    I opened a case with HP Support and they say I need to swap the G.Skill RAM for HP branded RAM!

    Is this a problem with the BIOS that HP needs to fix, a problem with the G.Skill RAM, or a problem with my specific systemboard? Am I really operating with 24GB of RAM, and that the BIOS is just providing a bad report (and I should just ignore it)?

    Thanks for reading, if you made it this far!
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