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    New ROGer Array pbthrane PC Specs
    pbthrane PC Specs
    MotherboardASUS Maximus IV Extreme
    ProcessorIntel Core i7 2600K @3.40 GHz
    Memory (part number)KHX1600C9AD3B1K2/4G
    Graphics Card #1NVIDIA GeForce GTX 1060 6GB
    Storage #1Kingston A400 120GB 2.5'' SSD
    CPU CoolerCorsair Hydro Series H80
    CaseFractal Design Define XL R2
    Power Supply850 W Chieftec NTRO 85+
    OS Win10 Pro x64

    Join Date
    Mar 2018

    Error55 "No memory installed" switching from 4GB to 16GB kit on AsusMaximusIVExtreme

    I recently put an old build that had been lying in parts back together and installed it in a new tower with a new GPU. It is working well with a 4 GB Kingston RAM kit - plays PUBG, runs smoothly, but needs more RAM.

    I therefore purchased a used 16 GB Kingston RAM kit. When I install it, I get error message 55: Memory not installed.

    My question is: How can I get this RAM kit to work?

    First, let me tell you the build as it was before I installed the new RAM. This works. I can install the old RAM blocks and boot the machine:

    Motherboard: ASUS Maximus IV Extreme REV 3.0 (please note, not the Extreme-Z, the Extreme)
    BIOS recently flashed to the most recent 3604

    CPU: Intel Core i7 2600K @3.40 GHz
    Cooled by Corsair Hydro Series H80 water cooler

    GPU: MSI GTX 1060

    SSD: Kingston A400 120GB 2.5'' SSD used for booting
    OS: Win10 Pro x64

    PSU: 850W Chieftec NTRO 85+

    RAM: KHX1600C9AD3B1K2/4G - 2 sticks of 2 GB installed in slots DIMM_A2 and DIMM_B2. These are called HyperX blu


    The new RAM kit is KHX1600C9D3K4/16GX. 4 sticks of 4 GB. These are called HyperX Genesis.
    When I install them, the motherboard reports Error 55.

    I have of course tried to install them one at a time in each DIMM slot. And I have tried all combinations of pairs in DIMM_A1/DIMM_B1 or DIMM_A2/DIMM_B2 as well as all 4 sticks. I also trust that the sticks have been correctly installed every time I have tried.

    Edit: It is possible to boot the machine with one of the new 4 GB sticks in the farthest DIMM_B2 or DIMM_A2, but not in DIMM_B1. All 4 sticks work in this manner. It is with pairs of sticks that I get error 55.

    I have also tried to press the BIOS reset button on the IO. No luck.

    The motherboard works because the old RAM sticks run on it. I trust the seller who told me the new 16 GB sticks work. From studying forums on similar topics, I assume it may be one of 3 things:

    1. RAM voltage settings in the BIOS - I am not proficient in setting this up and would need guidance
    2. BIOS version. I have the newest 3604 - perhaps a downgrade is needed?
    3. CPU seating - though I do not have reason to suspect this as the machine is working just fine with the old 4 GB sticks.

    This should not bias your replies to suggest how I troubleshoot this, I am only trying to provide my level of insight for your full insight.

    I asked the seller and was told these RAM were running with no issue on his X79A-GD45 motherboard when he took them out 2 weeks ago to ship them.

    Links for components to save you time:
    Old RAM, working:
    New RAM, error 55:

    UPDATE: The issue is now solved. The problem was pins in the CPU socket had been bent due to overtightening of the CPU cooler. I straightened the pins and now everything runs.
    Last edited by pbthrane; 03-19-2018 at 09:47 AM. Reason: update

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