[Guide] How to take full control of the i7-8750H (Advanced version)

Discussion in 'MSI' started by hackness, Sep 19, 2018.

  1. Avé César

    Avé César Notebook Consultant

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    Here's some screens shoot on another demanding new game ''A Plague Tale"

    3 .jpg 4 .jpg
     
    Last edited: May 19, 2019
  2. hackness

    hackness Notebook Virtuoso

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    Actually with your current undervolt, if only the CPU is running and without the IMON mod, x36 x6 cores would land at around 45-46W, but if the dGPU is turned on it should add another 4-6 watts to the package wattage. However, that is when the CPU usage is at 100%, the CPU usage while gaming would be much less than that.

    As the 2 screenshots you have shown shows that the CPU usage is quite low, the CPU in the first screenshot even down clocked due to not enough CPU usage, the 2nd screenshot has the CPU frequency up clocked but then the CPU usage gets lowered.

    So if you want to really see IMON offset in action, the easiest way would be to push the CPU usage to 100%, at that time the wattage should have a clear difference according to the change on the IMON offset you have made. Remember you need to have at least x36 on the multiplier to make this mod worthwhile as that's where the PL1 really starts to kick in under very high CPU load after undervolted ;)
     
  3. Avé César

    Avé César Notebook Consultant

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    How do you know, or calculate that my cpu would be around 45-46W ?

    For the 2nd screenshot, cpu usage is lower cause of alt+tab for screenshot on throttlestop but the cpu reach 3400Mhz, sometimes fluctuate a bit. ( 100% CPU is a bad idea to see the IMON Offset. )

    Here's a screenshot on BF1 ( Max 83° on 2 cores on TS, PKG Power 21.5 Max on TS )
    5 .jpg
     
  4. hackness

    hackness Notebook Virtuoso

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    Because I'm also using the 8750H, before applying the IMON tweak, 3.6GHz @6 cores @100% was giving me 45-46W around the same under-volt offset. At 3.4GHz it's quite hard to reach the 45W mark when under-volted, especially when the CPU usage is under 100%. In your case, with IMON offset -11999, your CPU is draining only 33.5W Max as you saw only 21.5 Max in that game.
     
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  5. Avé César

    Avé César Notebook Consultant

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    Thx hackness, On your test at 3.6Ghz, did you play with SS EPP at 0 ?

    I try to push a bit the cores 39 to 37 on fivr. 1st with Bios unchange, IMON Offset -11999, Battlefield 1 :
    6  BF1 39 to 37 on core Bios -11999.jpg 7 BF1 TS options PKG Power Max 30.4 Bios -11999.jpg
    2nd Try, with Bios -31999, same parameters on TS :
    9 BF1 39 to 37 on core Bios -31999.jpg 10 BF1 TS options PKG Power Max 31.4 Bios -31999.jpg

    On the 1st Test, on TS, 2 cores reach 89°, but PKG Power max is the same as the 2nd test, 3° less temp on 2 core max , maybe the map but the average was near the same 76°.
    On both, pkg power doesn't seems to change with Imon Offset, so how do i know if i apply these +12W or +32W ?
     
  6. hackness

    hackness Notebook Virtuoso

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    EPP doesn't matter here because I was placing 100% usage on the CPU.

    It's kind of hard if you are only testing this from a gaming perspective as there are many uncertain bits in that testing environment.

    See if you can have the fans go on full blast and just simply run TS bench 12 threads 64M without turning on the dGPU for both environments.

    It'll be a really quick test as you are only trying to see the highest wattage recorded during the 100% run.

    Edit: I'd suggest you switch it to PKG Power and observe the current reading, don't just jump straight to the Max power without actually seeing the current reading.
     
    Last edited: May 21, 2019
  7. Avé César

    Avé César Notebook Consultant

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    It goes from idle 0.4W straight to 21.8W, in 6.663 seconds (Bios IMON -31999 ). I could be wrong, certainly cause i don't understand well all, but for the pics that i share before, it doesn't seems to change on the pkg power with different IMON.

    Thanks Hackness for trying to help me... will stop here my investigation, don't wanna flood your guide with this ;)
     
  8. hackness

    hackness Notebook Virtuoso

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    No problem, what I wanted to say was that if you do the 100% load for the -11999 and compare their wattage, you should have an answer to it.
     
  9. gmn

    gmn Newbie

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    Hello @hackness

    I am not too bothered about battery life. But are there any tips in this guide that will specifically help with gaming performance and things such as frames per second?

    Many many thanks

    edit: my specs are 15.6" MSI GT63 Titan 8RF-027, 120Hz FHD G-SYNC, i7-8750H, 16GB DDR4, 256GB M.2 PCIe NVMe SSD+1TB HDD, 8GB GTX 1070,Win10
     
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  10. hackness

    hackness Notebook Virtuoso

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    If for gaming only:

    1. Chapter 4 in the front page, you can skip all other chapters.

    2. To add a negative offset to the reported TDP (Wattage) so the 45W limit is never reached to have full turbo all the time plus AC/DC Loadline mod:
    http://forum.notebookreview.com/thr...advanced-version.823065/page-11#post-10879610

    3. To OC the RAM (Mine is Samsung, every brand has its own limit), need some errors and trials to search the suitable timings:
    http://forum.notebookreview.com/thr...advanced-version.823065/page-13#post-10898033
     
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