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    New ROGer Array LiKenun PC Specs
    LiKenun PC Specs
    ProcessorAMD Ryzen 9 7950X
    Memory (part number)Kingston KSM48E40BD8KM-32HM
    Storage #1Intel Optane SSD 905P Series 380GB
    CPU CoolerNoctua NH-D12L
    CaseSilverStone RM42-502
    Power SupplyCORSAIR AX1600i Digital ATX Power Supply

    Join Date
    Nov 2022

    Post TIL: Using the PCIe 4.0 Connectivity from Chipset Makes a Noticeable Difference

    Well, I did a quick and dirty random 4k read test on my SSDs using the AIDA64 Extreme software that came with my Crosshair X670E Extreme. It looks like there is a very good reason not to use the PCIe 4.0 connectivity if you can help it. That means the PCIe 4.0 x4 slot at the very end of the board and the CPU-facing side of the M.2 riser. They both come from the chipset.

    Although the Intel Optane SSDs are all PCIe 3.0, they are still the fastest you can get for random I/O, so it illustrates the issue well:
    Click image for larger version. 

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    Using the PCIe 4.0 M.2 slot dropped the random read speed from 305 MB/s to 281 MB/s for the Intel Optane 905P 380GB. You get a similar performance drop if you pick Best Power Efficiency from the Windows System Power Mode options.
    Last edited by LiKenun; 11-17-2022 at 03:31 AM.

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