Mac Mini 2018 4.6GHz boost?

Discussion in 'Mac mini' started by paxos, Nov 30, 2018.

  1. paxos macrumors newbie

    Feb 25, 2011
    Quick question:
    I got the Mac Mini 2018 with the "3.2GHz 6‑core 8th‑generation Intel Core i7 (Turbo Boost up to 4.6GHz)" CPU.

    But according to the Intel Power Tool the CPU never hits more than 4.3GHz.

    Was anyone able to see that boost yet?
  2. rmdeluca macrumors 6502

    Oct 30, 2018
  3. paxos thread starter macrumors newbie

    Feb 25, 2011
    Thats a great post, thanks! Can you give some details how you simulated a single CPU task?
  4. rmdeluca macrumors 6502

    Oct 30, 2018
    Quit everything - all killable background tasks. Then spin loop yes > /dev/null in a command prompt.
  5. paxos thread starter macrumors newbie

    Feb 25, 2011

    4.38GHz is the max I can get. At least I can confirm my theory is wrong that the CPU is capped at 4.3GHz
  6. SoyCapitanSoyCapitan macrumors 601


    Jul 4, 2015
    If you're familiar with observing turbo boost in Windows there's no difference. CPUs rarely hit their maximum clock speed and even more rarely hold it there. Only when they are overclocked because that can disable Speedstep.
  7. Spectrum macrumors 65816


    Mar 23, 2005
    Never quite sure
    Do you have activity monitor running? This has 6 threads running and may cause the max turbo to drop due to simultaneous workload.
  8. Ploki macrumors 68040

    Jan 21, 2008
    i9 in 15” never hits above 4,5 (out of 4,8).

    @leman speculated that there’s a “thermal boost” available only under limited circumstances and available for periods shorter than sampling frequency... (2-3ms).

    I dont know really, i think this is bordering false advertising either on account of Intel or Apple.
  9. leman macrumors G3

    Oct 14, 2008
    According to the wikipedia, the turbo boost is limited to 4.3Ghz if four or more cores are in use. Since there is always something running in the background, this might be what you are seeing.

    TVB is only a feature in i9 CPUs.
    --- Post Merged, Dec 11, 2018 ---
    Your results are consistent with two active cores, boost up to 4.5Ghz.
  10. Ploki macrumors 68040

    Jan 21, 2008
    Oh yeah, my bad. Thanks for chiming in.
    Makes sense

    Off topic, Reading more about TVB i cant see it happening in the i9 MBP.
  11. Saiph53 macrumors newbie

    Dec 11, 2018
    You can force the system to only use one core (with or without hyperthreading) with the Xcode Instruments tool. It will then run at 4.6 GHz when running yes > /dev/null.
    2018 mini i7.png

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11 November 30, 2018