no difference after undervolting ? 10875H

Discussion in 'Hardware Components and Aftermarket Upgrades' started by jojonono, Nov 16, 2020.

  1. jojonono

    jojonono Notebook Guru

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    >>> You are pulling 90W from a CPU that has a 45W TDP rating. What are your expectations? Any laptop heatsink and fan are going to struggle trying to continuously dissipate that much heat. It would be normal for your CPU temps to go up over time while gaming or running any stress test.
    i didn't engineer this chipset, am simply saying i cant see an effect on temps when undervolting, but for the sake of this argument ill make a 30 minutes test Again and compare to my original results here and see IF i can hit over 4 Ghz (less throttling) with undervolting...

    I ran RE2 Remake game, temps were identical to what i saw before as soon as launched even at -125 mV maybe am missing something... or maybe temps doesnt necessary have to reduce with TS ??, only will get less throttling and hence the name of the program ??!

    i know for sure 10th Gen chipsets can't possibly go that low in voltages so am speculating, the lowest i read 10th gen chip can reach maybe 80 mV ! now ur asking me to go even lower up to -200 mV ?!...

    thank you for your reply ...
     
  2. tilleroftheearth

    tilleroftheearth Wisdom listens quietly...

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    Do you know for sure? How?

    You win or lose by thinking you win or lose. ;)
     
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  3. unclewebb

    unclewebb ThrottleStop Author

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    Reducing the CPU voltage can result in increased performance or decreased temperatures. You might see both or you might only see one of these. You should see something if the undervolt is working.

    Most of the 10th Gen testing that I have seen is for the 10750H. Have you seen a wide range of user testing of the 10875H?

    The 10875H should be a better binned CPU. Perhaps Intel is using cache that is 100% stable at -125 mV like many of their previous gen chips were stable at.

    You are saying that the undervolt is not working on 10th Gen CPUs. Some desktop boards have an option in the BIOS that bypasses the CPU voltage settings that ThrottleStop lets you access. If your computer does not crash then it is possible that you are 100% correct and CPU voltage control in ThrottleStop is not doing anything. Best to do some testing and prove this one way or the other.

    Run Cinebench R20 or R23. With an 8 core CPU it should not take you 30 minutes to run a test. Easy enough to run this test at default voltage and then run the test again after reducing the voltage.

    :vbthumbsup:
     
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  4. senso

    senso Notebook Deity

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    How can you run a -125mV undervolt and at the same time say FOR SURE that it doesn't work below -80mV, you cant even maintain continuity in two sentences..
     
  5. unclewebb

    unclewebb ThrottleStop Author

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    I was helping a guy today on the TechPowerUp forum with his 10th Gen 10750H. His cache undervolt is only stable at -73 mV. That is kind of pathetic but it seems typical for these 10th Gen 6 core CPUs.

    He was doing some Cinebench R23 testing with his core offset at -150 mV. It took a long time to convince people that using different offset voltages for the core and cache is a good thing to do. Now there is an internet myth that a 2:1 ratio between core and cache is some sort of magic number and you should not undervolt the core any more than that. I suggested to press on. Ignore the myths and do some proper testing.

    His laptop has a 65W hard turbo power limit being enforced. By increasing the core offset to -200 mV, he immediately observed that his CPU throttled less and ran faster. A bigger offset core undervolt has helped him run faster, longer before turbo throttling at 65W begins. ThrottleStop is definitely working for him on his 10th Gen CPU. Power consumption is exactly the same as before so there is no difference in temperatures. That is what one would expect.

    https://www.techpowerup.com/forums/threads/why-doesent-cpu-go-back-into-turbo.274794/#post-4394928
    One user followed my crazy advice today and now his 10750H is probably near the top of the Cinebench pile compared to all of the other laptops running this same CPU. Do some Cinebench testing. It is a good tool to help get a laptop dialed in.

    @tilleroftheearth knows. Never say never.

    Edit - @MagillaGorilla is using ThrottleStop to reach over 4400 points in Cinebench R20 with his 10875H.
    http://forum.notebookreview.com/thr...l-to-unlock-all-hidden-options.830993/page-40
     
    Last edited: Nov 17, 2020
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  6. jojonono

    jojonono Notebook Guru

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    I finally found it, this:
    http://grabilla.com/0ab12-40eb711d-41b5-4963-aa98-66b1032f965b.png

    here:
    https://forums.tomshardware.com/threads/cpu-i7-10875h-temperature.3623641/

    the entire time i was under the impression i cant really go lower than ~0.80 mV, also a youtuber said the same thing to me, we are ALL reading similar reports on google saying 10th Gen CPUs dont undervolt well, lets just admit it ! but so far am at 0.125mV for BOTH core and cache

    funny thing one of my cores hitted higher temp 100c (momentarily only) but yes i saw LESS throttling (cant say for sure yet), but have u seen such behavior (if any) ever b4 with TS (ie. higher clock rates, but also higher temps ??)

    you said:
    now am at -.125 mV for both core and cache, do u want me to work on the core for now ? why do i need back the cache voltage if i loose stability not the core ?!?...

    anyways will try cinebench and keep u posted, thanks developer :)
     
    Last edited: Nov 18, 2020
  7. jojonono

    jojonono Notebook Guru

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    i saw no temp difference so i thought it wasn't doing nothing ! also am new to this area and dont know what to expect from undervolting nor did anyone suggest here (until I finally asked) and Uncle gladly replied to me and confirmed my assumption saying:
    "Reducing the CPU voltage can result in increased performance or decreased temperatures. You might see both or you might only see one of these. You should see something if the undervolt is working."

    such a shame though i wanted to lower the temps by undervolting...
     
  8. Jdpurvis

    Jdpurvis Notebook Evangelist

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    If temperature was limiting your performance, undervolting would give you more performance at the same max temperature. You could, of course, dial back on SpeedShift and get back to the performance you had before, and temperatures would drop. :) Note, however, that these processors are designed to tolerate temperatures up to 100 degrees, so temps in the 90's should not be worrisome.
     
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  9. unclewebb

    unclewebb ThrottleStop Author

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    Tom's Hardware / reddit are only testing when the core and cache offset voltages are set equally. Many users on Notebook Review have learned that their best results are achieved by setting the core offset much higher than the cache offset.

    The cache voltage is always the limiting factor. When you lose stability it is usually the cache that is causing the problem. When I suggest using different voltages, most people start at a point where the cache is already set too high. You either have a fantastic, well binned CPU or at -125 mV, your cache offset might already be too high.

    Do some Cinebench testing. The goal is to run the entire benchmark at full speed with zero throttling. Open up Limit Reasons in ThrottleStop so you can watch if power limits or thermal throttling is holding you back. Bump only the core up in steps of -20 mV or -25 mV and test again.

    There are users on Notebook Review running some of the fastest 10875H CPUs in the world. Follow their settings and advice.
     
    Last edited: Nov 19, 2020
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  10. jojonono

    jojonono Notebook Guru

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    i got 9000+, how is that possible ?!...
    http://grabilla.com/0ab13-e31e3a58-84a1-4db8-9eb7-a6da609f936e.png
     
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