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  1. #1
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    Slow RAM write/read/copy/latency

    Am struggling with a mem issues with my new build. Basically, AIDA64 is giving very slow mem speeds and latency: Mem read: 68344 ; Mem write: 82664; Mem copy: 69897; Mem latency: 103.2ms.

    Please would anyone have any ideas?

    Build details:

    Threadripper 1950X || Titan X (Pascal) || Asus ROG Zenith Extreme || 32gb @ 3000 || Samsung 960 Pro 2TB, 2x Samsung 960 Pro 2TB, Samsung 850 Evo 4TB || BeQuiet Darkbase 900 Pro || Corsair H115 AIO || Corsair RM850i PSU|| AOC AGON AG352UCG 21:9 monitor

    Mem details: Vengeance LPX 32GB (4x8GB) DDR4 DRAM 3000MHz C15 Memory Kit - Black (CMK32GX4M4C3000C15)

  2. #2
    ROG Enthusiast Array JHR1979 PC Specs
    JHR1979 PC Specs
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    Sounds normal, Got just the trial version of AIDA, its giving mem read 75200 and latency 92,2. (in the default crative/uma mode, not bothered testing gaming/numa mode yet)

    got 4x 8GB g.skill flare X 3200MHz / CL14

  3. #3
    ROG Guru: Yellow Belt Array
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    Straight of copy of my reply to someone else about UMA/NUMA over at Nvidia forums that could not find the option on their MSI.
    There are 2 ways swapping between NUMA and UMA.
    I think it should be somewhere similar in the UEFI on your MSI.

    --> Advanced \ AMD CBS \ DF Common Options
    Then look for "Memory Interleaving"
    Auto or DIE --> Distributed Memory Access Mode -- UMA (Uniform Memory Access) -- 1 CPU high latency
    Channel --> Local Memory Access Mode -- NUMA (Non-Uniform Memory Access) -- 2 CPU low latency

    You can also use "AMD Ryzen Master" to swap between the two modes in Windows but it requires a restart.
    http://www.amd.com/en/technologies/ryzen-master


    With Ryzen Master you can also set CPU to Creator mode or Game Mode.
    Creator Mode syncs all cores to 3.4
    (Good place to start for anything that require 100% load for an extended time and so on).

    Game Mode
    turns off one CPU for compatibility, in short changes your CPU into a 1800X. ^^
    Keep in mind this moves all heat to one side, so be careful with a cooler that does not have
    full coverage of the IHS.
    If latency in UMA is around 90ns to 100ns, then NUMA should give about 64ns to 74ns I guess.
    Latency is also affected by your CPU speed/overclock.

    I would only use Game Mode if there is any compatibility issues, but it is not required to run NUMA mode.

    Experiment to find best result both modes are useful.
    Keep in mind latency might matter more on something like a online game.
    Last edited by Mikan02; 09-25-2017 at 06:05 PM.

  4. #4
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    Quote Originally Posted by JHR1979 View Post
    Sounds normal, Got just the trial version of AIDA, its giving mem read 75200 and latency 92,2. (in the default crative/uma mode, not bothered testing gaming/numa mode yet)

    got 4x 8GB g.skill flare X 3200MHz / CL14
    That reassures me a bit; but I've seen some benchmarks with mem read at around 92000 and latency around 60ns - I'm also getting quite low PC Mark 10 scores of 4807

    NUMA gives:

    Mem read: 84857
    Mem write: 84489
    Mem copy: 77753
    latency:76.2
    Last edited by Dafadau; 09-26-2017 at 05:05 PM.

  5. #5
    ROG Enthusiast Array JHR1979 PC Specs
    JHR1979 PC Specs
    Laptop (Model)ROG G752VY
    MotherboardROG Zenith Extreme
    ProcessorThreadripper 1950x
    Memory (part number)4x8GB g.skill Flare X 3200/cl14
    Graphics Card #1Gigabyte GTX 1080 G1
    Sound CardSoundblaster Audigy RX
    MonitorAsus PG348Q
    Storage #1Samsung Evo 960 250GB
    Storage #2Samsung Pro 850 250GB
    CPU CoolerNoctua NH-U14S - TR4
    CaseCoolerMaster Cosmos II Ultra tower
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    Quote Originally Posted by Dafadau View Post
    That reassures me a bit; but I've seen some benchmarks with mem read at around 92000 and latency around 60ns - I'm also getting quite low PC Mark 10 scores of 4807

    NUMA gives:

    Mem read: 84857
    Mem write: 84489
    Mem copy: 77753
    latency:76.2
    Perhaps on those benchmarks you've seen the system was heavily overclocked and memory settings tweaked to the max.


    EDIT:

    OC'd the cpu to 3,8GHz, swapped to NUMA mode and this is the result:
    (just to show how it is possible to get higher results)

    Click image for larger version. 

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    Last edited by JHR1979; 09-27-2017 at 08:10 AM.

  6. #6
    ROG Guru: Black Belt Array Korth PC Specs
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    Graphics Card #1NVIDIA Quadro GP100GL/16GB, 16xPCIe3, NVLink1 (SLI-HB)
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    Storage #2Comay BladeDrive E28 3200GB SSD, 8xPCIe2
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    CaseObsidian 750D (original), 6xNH-A14
    Power SupplyZalman/FSP ZM1250 Platinum
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    Another man's settings or benchmarks mean nothing when anything is overclocked, lol.

    Your memory kit has tested latencies of 15-17-17-35 (at DDR4-3000, PC4-24000, 1.35V).

    Just curious, what values do you get from Intel Memory Latency Checker?
    "All opinions are not equal. Some are a very great deal more robust, sophisticated and well supported in logic and argument than others." - Douglas Adams

    [/Korth]

  7. #7
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    Quote Originally Posted by Dafadau View Post
    That reassures me a bit; but I've seen some benchmarks with mem read at around 92000 and latency around 60ns - I'm also getting quite low PC Mark 10 scores of 4807

    NUMA gives:

    Mem read: 84857
    Mem write: 84489
    Mem copy: 77753
    latency:76.2
    Looks ok I think.

    Random run CPU @3.4 and my G.Skill 3200 kit at 14-14-14-34 and rest auto.
    Read 90883
    Write 90563
    Copy 81612
    Latency 66.8

    I used the AIDA Cache & Memory benchmark to be quick, but it can be a bit off.
    I think that is cause it is running all tests after each other. Only memory read
    does not get affected so much since it is first.
    Usually more accurate running one and one in the benchmark section (main window AIDA64).

  8. #8
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    Quote Originally Posted by Korth View Post
    Another man's settings or benchmarks mean nothing when anything is overclocked, lol.

    Your memory kit has tested latencies of 15-17-17-35 (at DDR4-3000, PC4-24000, 1.35V).

    Just curious, what values do you get from Intel Memory Latency Checker?
    Here you go:

    Click image for larger version. 

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