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    válasz KaiotEch #432 üzenetére

    >Okosabb kérdés: Az a 180W-os TDP valahogy lejjebb tornászható, mondjuk overclock mellett?

    1.) 7nm -el fejlettebb gyártásal ( next year )

    2.) ha fontos a single core, akkor le kell tiltani a magok felét - és jobban mennek a játékok.

    3.) ha nem fontos a single core és egyenletesen elosztható a terhelés minden magra, akkor
    érdemes lehet picivel lejebb vinni pár paramétert, mert akár a fele TDP-vel elmegy minimális telesítményvesztés mellett.

    ...
    With standard XFR enabled in auto mode the 2700X will pull around 180W at
    the wall at full load. This might be useful if I had DDR4 3000 memory in
    it, but I don't, so there's no real need to pull that much power at full
    load. I was able to reduce this all the way down to 85W at full load
    without really impacting a concurrent -j 32 nativekernel NO_MODULES=TRUE
    test compile. Now, obviously, more compute-bound workloads will suffer a
    lot more, but I mostly do compiles and with 16 cpu threads compiles tend to
    be limited by memory bandwidth and not CPU frequency.

    NOTE! Some BIOSes these are in mW, others they are in W, double check!
    Incorrect settings can crowbar your PSU and/or blow up the CPU! The below
    tests are with XFR2 enabled with a PPT power envelope limit set. XFR2
    controlls the CPU frequency (rather than using manual OC settings for the
    CPU frequency).

    time make -j 32 nativekernel NO_MODULES=TRUE >& /tmp/bk.out

    PPT 100000 (160W) - 1:06 (3.6 GHz at full load, 1-core 4.2 GHz)
    PPT 75000 (135W) - 1:07 (3.4 GHz at full load, 1-core 4.2 GHz)
    PPT 65000 (115W) - 1:08 (3.2 GHz at full load, 1-core 4.1 GHz)
    PPT 55000 (90W) - 1:09 (3.0 GHz at full load, 1-core 4.1 GHz)
    PPT 50000 (85W) - 1:10 (2.8 GHz at full load, 1-core 4.0 GHz approx)

    (TDC and EDC set to 300000 to get them out of the way)

    I settled on running the server with a PPT of 65000. That seems to be a
    reasonable trade-off and its a huge benefit to power costs. I've noticed
    similar behavior on the Threadripper 2990WX (the 32-core/64-thread
    beast)... there's just no need to run the TR2990

    ....

    http://lists.dragonflybsd.org/pipermail/users/2018-September/357883.html

    [ Szerkesztve ]

    Mottó: "A verseny jó!"

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