I recently tried undervolting my HP Probook 450 G5 with an Intel Core I7-8550U, but couldn’t

[Shlevan]

When i downloaded throttlestop almost all the options in the FIVR menu where greyed out.

 

[unclewebb]

The most recent BIOS versions lock out CPU voltage control for many laptops.

Post a screenshot of the FIVR window.

 

[Shlevan]

Btw, i watched a video from a guy on how to do undervolting and he had a slightly lower end cpu than me. he had the I5-8520U and for him all he options worked perfectly fine.

I7-8250U*

I5-8250U***

 

[unclewebb]

and for him all he options worked perfectly fine

For some laptops, the early BIOS versions left the CPU voltage controls in the FIVR window unlocked. Your FIVR screenshot shows that voltage control has been Locked by the BIOS.

Some laptops let you install an early BIOS version to unlock these features. Many laptops block rolling back to an earlier BIOS version. If something goes wrong, you can damage your laptop so it does not boot up at all. I think trying to install an early BIOS version is not worth the risk.

Until you find a magic way to unlock voltage control, there is nothing ThrottleStop can do. Search Google for your specific laptop model. Maybe someone, somewhere knows a secret.

 

[Shlevan]

Yeah, i'll take the risk i just want the best performance out this cpu

Bro i rolled the bios version back to 2019 and it's now actually unlocked!

Man, thanks for the help i’m now getting 3.6 ghz stable at 69 degrees while running cinebench

 

[unclewebb]

That looks better. What are your undervolt settings? For the 8550U, an offset undervolt of somewhere around -75 mV for both the core and the cache is usually stable.

In the FIVR window I would also set IccMax to the max, 255.75, for both the core and the cache.

 

[Shlevan]

Thanks for the tips man, yeah i encountered some instability issues whilst running at -100 Mv, and should i undervolt the igpu?

 

[unclewebb]

should i undervolt the igpu?

Do you have a Nvidia GPU as well as the Intel GPU? If you also have a Nvidia GPU then I do not bother undervolting the Intel GPU. There is usually very little to be gained.

If you do decide that you want to try undervolting the Intel GPU, make sure you undervolt both the Intel GPU and the iGPU Unslice. Undervolt these two the same amount and see how things go.

 

[Shlevan]

K thanks

Yeah the undervolting of the igpu did give me a 0-1 fps performance boost

And should i undervolt the system agent

 

[unclewebb]

should i undervolt the system agent

Try it and find out. I never do because I do not find any meaningful gains when undervolting the System Agent. Maybe your CPU will be different.

 

[Hamse_Baydaani]

@unclewebb i'm using same cpu i7 8550u hp laptop and have been using this settings for a while now and it's been stable core -170 and catch -85, only if set --180 and -90 the system will go bsod, that my sweet spot i played it with some games test it with cinebench and temp are great and got 500+ cinebench points .

But i need help with my clock speed if you see my photo when ever cpu fully loaded my clock speed starts at 31-32 i set on using speedshit but clock decrease to 2.6ghz after sometimes i think 30 seconds and it will remain 2.6ghz untill the test is over then it will go back to 3.2ghz after the test, before i undervolted the clock was 2.2ghz when cpu fully loaded and now 2.6ghz just gained 400mhz and amazingly good temperature my temp was 60+ on idle before and now 30+ and gaming it was 90+ and now 70+ to 82 i just can't understand why the clocks decrease instantly when fully loaded cpu some games are ok and run 3.2ghz i set becouse they are not cpu intensive and only using 30% to 50% but others are using more and same as test my cpu will go down to that 2.6ghz is there anyway to fix this and run my clocks to 3.2ghz always please help?

And i sent you 10 minutes of logs running cinebench.

 

[Shlevan]

Yeah man i have exactly the same problem, while on normal circumstances my cpu is from 3.4 to 3.6 Ghz and while under load it starts at 3.2Ghz and then after 5 seconds drops to 1.7Ghz and then rises again

@Hamse_Baydaani

 

[unclewebb]

@Hamse_Baydaani
Did you try increasing the turbo power limits?

These settings are telling your CPU to PL1 power limit throttle during any long term test at 17W. Your screenshot with Limit Reasons opened up shows that the CPU is doing exactly what you are telling it to do. Clear the Disable Controls box and try increasing the PL1 power limit to 25W and see if it helps. Better yet, try increasing both power limits to 35W. You have great cooling so no worries.

If you are using an early BIOS version, maybe your computer will allow you to run the CPU at the higher power level. Most computers with updated BIOS versions will not allow you to do this.

 

[Hamse_Baydaani]

Yeah man i have exactly the same problem, while on normal circumstances my cpu is from 3.4 to 3.6 Ghz and while under load it starts at 3.2Ghz and then after 5 seconds drops to 1.7Ghz and then rises again

@Hamse_Baydaani

it's so annoying man when you try trying to get most out of your cpu.

@Hamse_Baydaani
Did you try increasing the turbo power limits?

View attachment 304187

These settings are telling your CPU to PL1 power limit throttle during any long term test at 17W. Your screenshot with Limit Reasons opened up shows that the CPU is doing exactly what you are telling it to do. Clear the Disable Controls box and try increasing the PL1 power limit to 25W and see if it helps. Better yet, try increasing both power limits to 35W. You have great cooling so no worries.

If you are using an early BIOS version, maybe your computer will allow you to run the CPU at the higher power level. Most computers with updated BIOS versions will not allow you to do this.

No bro i didn't touch it's the default settings the only thing i changed is the speedshift to 32.

i changed the settings as you said and i don't see any improvement it's still doing the same thing it even decreed the clocks little bit i think. and for the bios i think windows updated it recently you can see it's few months ago version is it possible to downgrade to have more bios options because my bios there isn't power option settings at all and i sent you the log file running cinebench23.

 

[Shlevan]

@Hamse_Baydaani
Did you try increasing the turbo power limits?

View attachment 304187

These settings are telling your CPU to PL1 power limit throttle during any long term test at 17W. Your screenshot with Limit Reasons opened up shows that the CPU is doing exactly what you are telling it to do. Clear the Disable Controls box and try increasing the PL1 power limit to 25W and see if it helps. Better yet, try increasing both power limits to 35W. You have great cooling so no worries.

If you are using an early BIOS version, maybe your computer will allow you to run the CPU at the higher power level. Most computers with updated BIOS versions will not allow you to do this.

The cooling on the hp probook isn’t the best, i actually had to undervolt because i was always thermal throttling while gaming

it's so annoying man when you try trying to get most out of your cpu.


No bro i didn't touch it's the default settings the only thing i changed is the speedshift to 32.

i changed the settings as you said and i don't see any improvement it's still doing the same thing it even decreed the clocks little bit i think. and for the bios i think windows updated it recently you can see it's few months ago version is it possible to downgrade to have more bios options because my bios there isn't power option settings at all and i sent you the log file running cinebench23.

But how did you unlock the fivr control then, because i had to downgrade my bios version to a stable 2020 version

 

[Hamse_Baydaani]

The cooling on the hp probook isn’t the best, i actually had to undervolt because i was always thermal throttling while gaming


But how did you unlock the fivr control then, because i had to downgrade my bios version to a stable 2020 version

My laptop is hp to hp 15 but i used to thermal throttling too then the undervolt helped alot.

I don't know bro ever since i installed throttlestop all my settings were unlocked maybe they didn't locked when they updated my bios cuz i see from bunch people that newer bios locked the bios.

Bro does your bios gives you options to change power options and such?

 

[Shlevan]

My laptop is hp to hp 15 but i used to thermal throttling too then the undervolt helped alot.

I don't know bro ever since i installed throttlestop all my settings were unlocked maybe they didn't locked when they updated my bios cuz i see from bunch people that newer bios locked the bios.

Bro does your bios gives you options to change power options and such?

Yeah man, but i’m actually on a weekend trip now i’ll be back tomoroww so i’ll send you a screenshot, but i think i can set it to maximum performance etc

tommorow*

 

[unclewebb]

i don't see any improvement it's still doing the same thing

The log file shows that the CPU is PL1 power limit throttling right at 17W. It is common for HP laptops to use an embedded controller (EC) which is used to force this limit to the CPU. The MSR and MMIO power limits that ThrottleStop has access to are ignored. The lower EC power limit wins control of the CPU. There is nothing you can do about this limitation.

Some manufacturers leave the power limits completely unlocked when they first release a new laptop. This makes for some good initial reviews. After that, a BIOS update might be released that enforces a much more restrictive power limit. I am not sure if it is possible to find or install an early BIOS version. Many manufacturers prevent going back to an earlier BIOS version.

 

[Hamse_Baydaani]

The log file shows that the CPU is PL1 power limit throttling right at 17W. It is common for HP laptops to use an embedded controller (EC) which is used to force this limit to the CPU. The MSR and MMIO power limits that ThrottleStop has access to are ignored. The lower EC power limit wins control of the CPU. There is nothing you can do about this limitation.

Some manufacturers leave the power limits completely unlocked when they first release a new laptop. This makes for some good initial reviews. After that, a BIOS update might be released that enforces a much more restrictive power limit. I am not sure if it is possible to find or install an early BIOS version. Many manufacturers prevent going back to an earlier BIOS version.

It realy sucks bro i7 8550u is power hungry to be honest and the fact that manufacturer messed up big time releasing locked power limit on this system is realy overwhelming.

I guess i have to use it like this i don't think even downgrading bios will help me, but i will try if i can downgrade and see if helps.

 

[Shlevan]

It realy sucks bro i7 8550u is power hungry to be honest and the fact that manufacturer messed up big time releasing locked power limit on this system is realy overwhelming.

I guess i have to use it like this i don't think even downgrading bios will help me, but i will try if i can downgrade and see if helps.

For me downgrading the bios unlocked undervolting, so it might unlock the power limit for you.

 

[Hamse_Baydaani]

For me downgrading the bios unlocked undervolting, so it might unlock the power limit for you.

Maybe it's possible but it's unlikely my sis hp is same too always doing this and her laptop have early bios version and it's still the same just like uncleweb said we can't do anything when that Embedded controller have full authority over throttlestop tpls limits.

 

[Shlevan]

Maybe it's possible but it's unlikely my sis hp is same too always doing this and her laptop have early bios version and it's still the same just like uncleweb said we can't do anything when that Embedded controller have full authority over throttlestop tpls limits.

Yeah sadly, but i wanted to know if you undervolted the igpu or system agent because that also contributes to overall gaming performance

 

[Hamse_Baydaani]

Yeah sadly, but i wanted to know if you undervolted the igpu or system agent because that also contributes to overall gaming performance

I didn't undervolted those i only undervolted the cpu core and cache i heard those other settings aren't that important and doesn't give you huge performance too but i didn't try it yet.

 

[Shlevan]

I didn't undervolted those i only undervolted the cpu core and cache i heard those other settings aren't that important and doesn't give you huge performance too but i didn't try it yet.

Ah ok

 

[Lessleep]

Yeah, i'll take the risk i just want the best performance out this cpu

Bro i rolled the bios version back to 2019 and it's now actually unlocked!

View attachment 303717

Man, thanks for the help i’m now getting 3.6 ghz stable at 69 degrees while running cinebench

View attachment 303718

Man can you share how did you roll back your bios? I have probook 470 G5 thats having same issue as you and HP wount let me downgrade to old bios. Thanks.