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  1. #1
    New ROGer Array
    Join Date
    Nov 2021

    Question ROG Crosshair VIII Hero - Mixed Ram Speeds - Need advice

    I have a query about ram speeds on my motherboard. I have an Asus ROG Crosshair VIII Hero, BIOS version 3801 x64. CPU is a Ryzen 3900x.

    I'm running Unraid. After a system crash, I've been advised to clock back my ram by the Unraid team as it's known to cause parity issues with the Unraid system. I was advised to clock it back to 2167Mhz, I presume this was a typo and it should be 2166Mhz so I set it to that frequency.

    I have 64GB of ram in this machine. On the BIOS "main" screen it shows Total memory of 64GB & a memory frequency 2666Mhz.

    The two packs of ram were bought separately. As in I got 2 x 16 and then another pair a few months later. This is the exact spec of what I bought.

    32GB (2x16GB) Corsair DDR4 Vengeance LPX Black, PC4-28800 (3600), Non-ECC Unbuffered, CAS 18-22-22-42, 1.35V

    In the BIOS under "Extreme Tweaker" I've left everything to "auto' except I've changed the memory frequency to "DDR4-2666Mhz". The system boots and is stable in Unraid.

    My query is when I visit the BIOS and go to "Tool / ASUS SPD Information" the ram speeds are different.

    • Slot A1: 2666Mhz
    • Slot A2: 2133Mhz
    • Slot B1: 2666Mhz
    • Slot B2: 2133Mhz

    Why are A2 and B2 running below the set speed? It's bad enough I've had to clock down from 3200Mhz for OS stability but if there is still speed to be gained from slot A2 and B2 I would rather have them running at 2666Mhz.

    Can anyone advise? Thanks

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