Undervolting Ryzen 7 4800H on a laptop?

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!

 

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

 

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

 

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.

 

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.

 

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

 

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

 

ewwww what about the laptop with ryzen desktop CPUs?

 

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

 

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...)

 

I'd be interested in UV on mobile, too.
I'm currently trying to get some info in the xmg discord server regarding that topic.

I observed the 4800H likes to spike (and stay) at 1.3V cpu core which I think is surprisingly high.
While it seems indeed that it's a lot more efficient in the 1.0V / 25W range.

Guys in the xmg discord server report they manage to get their desktop AMD CPUs from 1.3v to1.04v, so I'd assume one could achieve similar results on the mobile counterparts ...
And I also remember I got my old i7 6700hq with -180mV(w/o gpu usage) or -160mV (with nv gpu use) offset to 0.95V or so.
Full turbo 3.3ghz was possible all the time (and it was effectively 12-15W less power consumption and obviously heat output). I really liked that.
I'd assume with the smaller process/structures on the new AMD that should be possible to get the voltage down, too.

Is there any official explanation from AMD why it's locked ?
And is it really completely hw locked,
or is there just no tool / documentation how to do it.
And is there a chance to brick the device like some of the xmg support hinted ...

 

Any luck with this tool? - https://github.com/sbski/Renoir-Mobile-Tuning

 

That's RMT.
While useful it can only set these values as far as I'm aware ...

Maybe the flygoat/ryzen_nb_smu can do more,
but idk how to use that tool tbh ...

I'd really want something like throttlestop, just 2 modes: absolute and offset.
The ideal would be ofc settings for every clock level/multiplier though.