Undervolting Ryzen 7 4800H on a laptop?

Discussion in 'Hardware Components and Aftermarket Upgrades' started by weareandrei, Feb 10, 2021.

  1. weareandrei

    weareandrei Newbie

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    Ryzen master utility that is used for that is not recognizing my mobile processor. It seems to be working only with a desktop. Is there any way to go around this problem and somehow undervolt the Ryzen mobile CPU? Or any other recommendation on how to decrease the temperature on my CPU without the thermal paste and stuff like that?
    Thank you guys!
     
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  2. KING19

    KING19 Notebook Deity

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    Sadly it still isnt possible and i dont know it'll be possible with the new Ryzen 5000 CPUs either but we'll see....
     
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  3. Charles P. Jefferies

    Charles P. Jefferies Lead Moderator Super Moderator

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    Maybe there's a way to increase the fan speed to maximum while gaming; some laptops provide controls for this ("max fans"). That would help.
    You might also try reducing the processor's maximum clockspeed (say, down to 3.8GHz) if the Ryzen utility provides such control. This would reduce temperatures at the expense of performance, but the Ryzen 7 4800H is very powerful so you should have some performance to spare.

    Charles
     
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  4. GrandesBollas

    GrandesBollas Notebook Evangelist

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    This is the OP's best option. I have a 4800H on my Legion 5. Without the ability to undervolt, the only other options to control thermals (including propping the laptop to keep the exhaust vents clear), is to manage the fan profile and undervolt the GPU. Out of the box, my laptop ran thermally hot, with power and thermal limit throttling on the GPU. I set my fan profile to balanced mode (lower fan profile results in a lower TDP max on the CPU), and undervolted my GPU via MSI Afterburner. Now, I don't have any thermal issues.
     
  5. KING19

    KING19 Notebook Deity

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    He can run it on performance mode which makes the CPU uses more power increasing his fans speeds but sadly with our Legion 5s we dont have manual fan control. Another option he can try is to run it on quiet mode which makes the CPU uses only 25W even when gaming resulting in lower temperatures and clock speeds, He can try disabling the CPU boost as well and its a easy tweak for it but that a last resort. Like i said in his other thread he can try to do a repaste or if he still within return window he can return his machine for another unit because his temps are very abnormal even for a 4800H.
     
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  6. ole!!!

    ole!!! Notebook Prophet

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    theres no 3rd party software that allows undervolting for ryzen cpus? thought those are around everywhere on amd reddit threads.
     
  7. KING19

    KING19 Notebook Deity

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    It only works for Ryzen desktops. AMD blocks it out for their Ryzen mobile CPUs.
     
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  8. ole!!!

    ole!!! Notebook Prophet

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    ewwww what about the laptop with ryzen desktop CPUs?
     
  9. MyHandsAreBurning

    MyHandsAreBurning Notebook Consultant

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    Ryzen Mobile Tuning (or RyzenAdj if not on Windows) is your best friend on mobile. You don't get to undervolt, but you can control the limits on how much power the laptop can draw while on boost (and how long the boost lasts for) as well as set threshold temps, TDP and current if desired.

    I usually fix my power limit on my 4800h at 25W which allows for all core 2.9Ghz or individual cores to boost to their maximum speed, while staying relatively cool. It also feels (based on measuring compilation times on large codebases) like the sweet spot in terms of performance per watt for heavily multithreaded workloads
     
    Last edited: Feb 16, 2021
  10. Landinel

    Landinel Newbie

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    I have the legion 5 and i dont have thermals problems with ryzen 7... I dont see more than 80-85 C°, and normally 70-75 C° (with metro exodus, control,Minecraft Rtx, Mass Efect Andrómeda...)
     
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