[Guide] Overclocking your Skylake X on the Mac OS x High Sierra

Discussion in 'Overclocking' started by pete1959, Sep 12, 2017.

  1. pete1959

    pete1959

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    Sep 12, 2017 at 6:53 AM #1
    pete1959

    pete1959

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    Hi and welcome to my Skylake x overclocking guide (with pictures).
    I'm using a Gigabyte X299 Aorus 9, but this is translatable, you'll just have to look in your bios for the equivalent settings.
    This guide is not a simple 'bang up the multiplier' o/c and you probably should have some experience of overclocking previously.

    First of all, this can't be done on the OS x!
    Although you can run the overclock in it :)
    Macs don't have good tools for overclocking, so you need to do this in windows (sorry).

    Another downer with OS x - HWMonitor doesn't work with the Skylake X yet, so you should be running the intel power gadget to monitor heat after the overclock.
    Screenshot 2017-09-02 19.36.44.png

    In windows (sorry).
    The tools you need are:
    HWiNFO64
    AIDA64
    CinebenchR15

    Open hwinfo and bring up sensors from the top menu bar. create enough columns to see all of the information you need. This can be done with an icon at the bottom with two blue arrows pointing out (picture to follow). Then open aida64 and in the menu select system stability test.
    OC Tools.jpg

    Luckily I have 2 really big screens.
    In Aida64, select the stress CPU ONLY and start. Check your temps on the hwinfo then stop the test after a few minutes.
    In Aida64 , select the stress FPU ONLY and start. Check the temps on the hwinfo then stop the test after a few minutes.

    The FPU tests the AVX offset which will be important later.

    The things you need to be monitoring in hwinfo are the temps for each of your cores and the VRM temps. Also note power (core #x vids) and the package power.

    Give Cinebench a run so we can have a baseline benchmark.

    So, on to the overclock.
    The following screenshots are for 4.8Ghz, we'll start with 4.5.

    In bios we go first to the frequency settings.
    Set the BCLK to a tiny bit above 100
    Set the multiplier to 45
    Set the XMP to profile 1 if you like.

    20170912_171633.jpg

    Go to advanced CPU core settings.

    Disable speed shift, C1E, C6/C7, CPU EIST, Energy efficient turbo
    edit: I turned EIST back on and it's going faster, but a bit hotter.
    Leave the AVX settings for now, we'll play with them later.

    You can see the package power limits. I noticed that the limits of my CPU cooling came at about 320 watts, so I set the limit there. That way the wattage will never be greater than my cooling can handle. (This is a cool bit BTW)


    20170912_171650.jpg
    20170912_171711.jpg

    Now to Voltage.
    Vcore loadline calibration we can set to Turbo

    20170912_171735.jpg

    Go to CPU core voltage control.
    This is a cool bit.
    Set the Vcore to normal and offset to +0.050
    Set the Mesh voltage to normal and the offset to +0.31
    This'll set CPU volts to about 1.27 and mesh to about 1.2 volts.
    This should be good for 4.8
    If you find the volts in HWinfo are different, simply tweak the CPU offset to make it right.
    If you only go to 4.5, you should be able to sit around -0.050 offset or more! Check and see, I had a stable 4.5 at 1.1 volts.

    20170912_171752.jpg

    Now get into windows and we'll do some testing.
    If you can't get into windows, go back to bios and lower the clock, although this is unlikely.
    Run up hwinfo and aida64.
    test CPU only and note the temps.
    Test FPU only and note the temps.


    CPU should be fine unless you have rubbish cooling.
    FPU is likely to be higher, but if we look at hwinfo, we need to avoid the throttling - it'll show you this in red. If it doesn't throttle it's ok.
    At this point we can run Cinebench to see if we have an improvement.
    Run it after every boot, but note that it makes the CPU hotter than the Aida64. Try not to freak out and don't let it get above 105 degrees. Do a wee practice on how to stop the benches quickly.

    Now we just go back to bios and keep bumping up the multiplier. We might have to bump up CPU voltage offset as well, until we get unstable or too hot or no longer see any benefit.

    Now, the AVX uses a heap of power and can't be at super high clocks.
    The AVX offset we see in a screen above is the downclock. so if the clock is 48 and we set AVX to 5 and AVX 512 to 6 (512 should always be 1 higher than AVX offset), then when AVX is running on the computer, the clock is really either 43 or 42. It's gone down by that amount we set.
    We decide how much that offset should be by running Aida64 CPU, then FPU (never both together), and when our FPU temps get to high, that is 1 above the max clock for AVX.
    Got me? So if we test at 4.5Ghz and it's sweet, then 4.6Ghz and FPU bench temps are too high, we set the offset to 1 and 2 (2 for 512).
    If we move on to 4.7, we set the AVX to 2 and 3. We move to 4.8 and it gets set to 3 and 4, and so on.

    Now because OS x doesn't use AVX yet, I think, I just cranked the offset up until the temps in Aida64 both CPU and FPU were the same.

    I'll attach my config so you can have a look. There's nothing special in it.
     
    showkingpup likes this.

    Attached Files:

    Last edited: Oct 6, 2017
  2. IgnitePro

    IgnitePro

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    Oct 6, 2017 at 12:46 AM #2
    IgnitePro

    IgnitePro

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    Hi, is there anyway you could pls "Translate" those setting to Aus Prime X299 Deluxe board. I also have the 7900X, :)
    Thanks
     
  3. pete1959

    pete1959

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    Oct 6, 2017 at 12:55 AM #3
    pete1959

    pete1959

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    Hi, not really possible I'm afraid. I don't have that board. Overclock.net might be able to help :)
     
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  4. IgnitePro

    IgnitePro

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    Oct 6, 2017 at 1:48 AM #4
    IgnitePro

    IgnitePro

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    No worries, thanks
     
  5. spyderfyre

    spyderfyre

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    Oct 12, 2017 at 10:38 PM #5
    spyderfyre

    spyderfyre

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    If you found a guide to overclocking for the Asus MB please let me know.
     
  6. IgnitePro

    IgnitePro

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    Oct 13, 2017 at 6:30 AM #6
    IgnitePro

    IgnitePro

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    :thumbup::thumbup::thumbup: For sure man.. It took me almost 2 weeks and still a no-go yet.. Single core goes up but multi core losing points :banghead::banghead::banghead:
     
  7. pete1959

    pete1959

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    Oct 13, 2017 at 6:50 AM #7
    pete1959

    pete1959

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    The good thing I found about X299 is that any overclock you do in windows seems to stick in the OS x without any clover changes.
    I remember my X99 was a bit of a challenge...
    Your first step is to find an Asus overclock guide, probably from overclock.net. Get it running nicely in windows and oc'd on all cores. It should work just as well in the mac.
    @IgnitePro you could be thermal throttling. What are your temps in cinebench?
    And try with EIST on and then try with off. Scores are better on, but temps are higher.

    I ordered a delid kit for my i9 7900 today so stand by for better scores :p
     
  8. IgnitePro

    IgnitePro

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    Oct 13, 2017 at 3:18 PM #8
    IgnitePro

    IgnitePro

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    I bought my CPU delidded by Silicon Lottery,
    https://siliconlottery.com/collections/frontpage/products/7900x47g

    However, I follow their setup,
    • 1.237V Vcore
    • -3 AVX Offset
    • -5 AVX512 Offset
    and run a test on Window 10 Pro but the geekbench for multi-core still around 38K
    (which I have with 10.13 without OC at all), never got any better.
    Followed couple guides in Overclock.net, or Youtube, still nothing improvement :confused::confused::confused:
    I really hope somehow I could push it around 45K or 50K at 4.7 of 7900X..
    Thanks for the reply, :thumbup:
     
  9. DSM2

    DSM2

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    Dec 3, 2017 at 6:51 AM #9
    DSM2

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    First off all I bet CPU SVID Support is enabled in your bios, biggest mistake if you want to Overclock! Turn it off!!!
    Second your overclocking settings definitely are incomplete!
    Third one: 45k or 50K at 4.7 ? You are dreaming, wake up!
    You would just see something in Geekbench with 10.12.6 but not with High Sierra! I got mine stable with 1.26Vcore @ 4.8 GHz without delidding. Geekbench was 42.xxx K
     
  10. IgnitePro

    IgnitePro

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    Dec 3, 2017 at 3:45 PM #10
    IgnitePro

    IgnitePro

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    That was couple months ago, lol.. I got the 7900X multicore at 43975, singlecore 5933, 8 cores @4.8, 1.28v, 2 cores @4.7, 1.237v :mrgreen:

    C9A22D89-6769-4D75-B31B-3A0DBC585929.jpeg
     

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