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Memory/DIMM issue with ASUS P9X79 Deluxe

Asus P9X79 Deluxe
Intel Core i7 3930K
Corsair Memory 16GB(4X4GB) 2*CMZ8GX3M2A1866C9
Corsair H60 Cooler
Seasonic X Series 850 PSU

Updated BIOS to Rev. 1203

I finally solved the MemOK issue last night and got it to POST. All 16Gb was showing up in the BIOS and all DIMM slots where Normal. I ran the board three times all with good readings. Even with the memory set to XMP 1866.

Today I put it all together in the case install windows and now its only reading 12 out of the 16 gigs. I had this similar problem with the first board so I RMAd it. I've heard these boards are picky with certain memory but this makes me want to RAGE quit.

Do DIMM slots go bad so quick? Any suggestions what can be causing this?

Anyone with similar board have any suggestions for better compatible RAM? I'm thinking of getting the Corsair PC1600 32GB(4*8) kit CMZ32GX3M4X1600C10 or the G Skill 32GB(4*8)Kit F3-2133C9Q-32GZH. Anyone using similar kits int theirs?

Thanks in advance for any help.

6 answers Last reply Best Answer
More about memory dimm issue asus p9x79 deluxe
  1. I also ran CPUz and it read 16GBs even though its only showing 12. I'm starting to think that using 2 * 8GB kits is the problem. Can anyone confirm this?

  2. Best answer
    So it never occurred to you that the CMZ8GX3M2A1866C9 is a Dual Channel kit and not one of their Quad Channel kits specifically designed, tested and XMP optimized for the X79?!

    It's not ASUS and by all appearances poor choices.

    Exchange the kit for a Quad Channel kit:
    16GB 4x4GB: CMP16GX3M4X1866C9, CMP16GX3M4X1600C7, CMZ16GX3M4X1600C9, or my favorites CMZ16GX3M4X1600C9G.
    32GB 4x8GB: CMT32GX3M4X1866C9, CMP32GX3M4X1600C10, CMZ32GX3M4X1600C10, or CMZ32GX3M4X1866C10
    Corsair X79 kits -

    I run 8x4GB on an ASUS so it's not the DIMM slots -- it's the kit choices; my rig


    You can try to manually set the RAM:
    AI Overclock Tuner -> Manual ; Auto may work
    DRAM Frequency -> DDR3-1866
    DRAM Timing Control /Enter
    DRAM CAS -> 9
    DRAM RAS to CAS -> 10
    DRAM RAS PRE -> 9
    DRAM RAS ACT -> 27 ; no typo see similar Quad kit -
    CPU VCCSA Voltage -> Manual
    CPU VCCSA Manual Voltage -> 1.20v ; max safe voltage
    DRAM Voltage AB -> 1.55v ; if needed
    DRAM Voltage CD -> 1.55v ; if needed
    F10 Save & Exit = Yes

    Then run Memtest86+ for 4 full passes and stop IF any errors.
  3. Damn It! The little details can get ya.

    Will give Newegg a call and get them exchange if still possible.

    Thanks for the help.
  4. ^ I edited above.
  5. Best answer selected by djmenez10.
  6. This topic has been closed by Nikorr
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