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  1. #1
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    should I enable XMP on Asus Rampage V Extreme with Xeon

    Currently my 2666MHz RAM works at 1866MHz probably cuz of CPU limitation ,Xeon E5-2640 V3.
    I set target DRAM frequency to 2666MHz which is default by memory modules of Corsair but then MB didn't want to post.
    So I had to remove CMOS battery as adviced to reset the BIOS.
    So I'm curious to know should I enable XMP (RAM supports it),would the board POST and what benefit if any would I get with it?

  2. #2
    ROG Enthusiast Array PipJones PC Specs
    PipJones PC Specs
    MotherboardAsus Rampage V Extreme
    ProcessorIntel i7-6850K @ 4500 CPU / 3900 Cache / AVX -2
    Memory (part number)CMK16GX4M4C3200C16
    Graphics Card #1nVidia GTX1080ti FE with EK W/C
    MonitorIiyama G-Master GB2888UHSU
    Storage #1256Gb Samsung NVMe (MZ-V5P256BW)
    Storage #24x HGST HTS721010A9E630 1TB 2.5" 7K1000 SATA 3 7200rpm (RAID 10)
    CPU CoolerCustom EK Loop
    CaseCorsair 900D
    Power SupplyCorsair AX1200i
    Keyboard Corsair Raptor K30 Gaming Keyboard
    Mouse Corsair M65 PRO RGB FPS Gaming Mouse
    OS Windows 10/64
    PipJones's Avatar
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    Apr 2015
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    I did some recent testing with a E5-2620 V3. Just like your 2640 it only supports DDR4-1600 and 1866.

    No, I don't think you can not set XMP. This will set the RAM speed to 2666 which is not compatible with the CPU and will prevent the system from booting.

    You should not need to clear CMOS.

    You should be able to get to BIOS by hitting the little red "safe boot" button on the motherboard.

    If you wish to improve RAM performance you could try lowering your timings. I got down to something like 9-9-9-nn with DDR4-3600 running at 1833. Benchmarks improved slightly - no real difference in day-to-day work.

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