They likely wont unless the CPU is hitting T-junction at 100C, however there are some steps you can try yourself:
Raise the rear of the notebook, undervolt the CPU and confirm it's taking, consider disabling Turbo, enable VSync from the NVidia Control panel, look a undervolting the GPU, a lot can be done...

Realistically 80C or greater is pretty normal for a gaming  notebook under load, cooler you can get them to run the better.  90C is on the high side although not destructive.  Key is to understand what exactly is the cause and why it's not cooling off.  In my experience several small steps can often add up enough to reduce the temperature to stop any thermal throttling and bring the operating temperature into line say 85C max.

If your getting a good unvdervolt and verified it.  You can try to seal the edge of a cooling pad by applying some rubber/foam strip to the cooling pad this will force more air through the notebook.  You can also try disabling Turbo as that will make a significant reduction in temperature, however some games may also reduce FPS

I recommend ThrottleStop 8.60 and here's why

This is Prime95 running Small FFT's which is way more load than any game will put on the CPU -132.8mv undervolt no thermal throttling. Notebook will run as long a you want under this extreme load.  This is with the fans set to auto at around 4.2K / 4.4K, maximum will pull the temperature down a little further.  In gaming most I see is mid 80's (peak) on the CPU and high 70's (peak) on the GPU, stock paste GPU is not undervolted, all games on highest settings

Predator 17 G9-793 7700HQ, 32Gb, GTX 1070, BIOS 1.13, Windows 10 1803 - Ambient temperature 25C / 26C, maximum temp under Prime95 94C

Q-6

Undervolt wont break your warranty, just remove the files    ThrottleStop is just a .exe no installer required.  Just don't speak to Acer support regarding undervolting, like as not they don't fully understand and are following company policy.  Undervolting will reduce the load on the notebook, with the only risk being that if you go too deep the system will crash, so being backed up makes sense.  My G9-793 CPU is rated for 45W, with boosts up to 56W (PL1 & PL2) these are Acer's settings under ThrottleStop the CPU will never pass 44W

Full Load under Prime95 Small FFT's, 4 cores, 8 threads @ 3.4GHZ 94C, yet less than 45W, no thermal throttling.  No game will stress your CPU to this level, Prime95 small FFT is so brutal that some wont even use the stress test.


1-Raise the rear one inch, on a flat surface desktop etc.
2-Turn on CoolBoost
3-Undervolt the CPU, follow the guide at the top of the forum, no need to automate ThrottleStop starting up just yet.
4-Mod a cooling pad to seal to the bottom of the notebook to force more air through the system
5-Ambient temperature also plays it's part so we need to have a reasonable approximation

If your not sure post back with screen capture's and we will walk you through it or at least point you in the right direction.  You should be able to get under 90C easily unless something is really off with the notebook.

Q-6

My father bought me a Predetor Helios 300 in Amazon US. I live here in the Philippines and my father is not a US citizen. My laptop stopped working so i brought it to a acer service center in the philippines they said the motherboard is broken and needed to replace. They said international warranty not covered in the philippines but covered in the usa and return it to the seller. I'm so disappointed in acer now.

Here is the best solution - https://community.acer.com/en/discussion/comment/652998/#Comment_652998