Even after undervolting -0.155v temps are still above 89⁰ C r nitro 7 AN715-51

Hi,
Could you please post the full model name of the laptop, which program you are using for undervolting?  Have you undervolted by-0.155v? If you have used TS, post the FIVR picture.

Jamalmohi said:

@brummyfan2 Hey I used Intel xtu and my model number is acer nitro 7 AN715-51 
i5 9300h and 1660ti....I used Intel xtu and I undervolted to -0.160v and yet I get high temperature....what to do?

I am not familiar with XTU, I would suggest you try Throttlestop to undervolt and see whether it helps, please read these threads, you don't have to use the profiles but they will help you with the settings.
what are the best undervolt settings for i5 9300h ? nitro 5 AN515-54, — Acer Community
ThrottleStop Undervolt Profiles Pre-Made — Acer Community

Jamalmohi said:

@sri369 my idle usage of cpu is 10-13% even when all applications are closed. And I undervolted it to -0.155v and limited the procesor to 3.8ghz(originally 4.1ghz) but still the temps are high in the 92-94⁰C range.....I play just apex legends and on this setting my max temp hit 96⁰C (I use low settings )
My config are i5 9300h and 1660ti....

I see an issue already. Idle usage of 10-13% is VERY HIGH. That is much more than the CPU usage on my laptop while doing things like browsing. Below is the screenshot from Nitrosense from the last some time I spent on youtube watching videos.

There is something else going on in the background in your system and that needs to be looked into. Check under windows tasks. Check task manager for any processes.

That actually makes sense - since the UI needs to be rendered.

On my box:
Nitrosense in foreground

Nitrosense open, but minimized to task bar

I normally have it minimized to task bar when checking for something.

What I can suggest further is to get a laptop cooling pad (I have mine connected to my monitor, so its always on a cooling pad). This can help reduce temps. And 40-45 is a good temp without a cooling pad. For me when idle, with pad on, temps are normally around 35-40. So yours being another 5 is fine.

Room temperature also matters.

Keep fans on auto, and turn on cool boost.

Jamalmohi said:

@sri369 what about temps on load?..I have seen videos on youtube where their temps dropped after undervolting from 90 to 70.....but mine is still same ...I their something wrong with my laptop...I got it in September last year.

Did you look into this --> https://community.acer.com/en/discussion/627441/guide-thermal-throttling-on-nitro-7-model-an715-51-mitigation

I listed out all I did to get my temps from 90s (thermal throttling) to low 70s under heavy loads.

List and post screenshots of everything you did.

Also, while you do that, open task manager showing individual CPU information, and screenshot it (after keeping it open for atleast 5 minutes). Like below...