Acer Predator temperature

Hello mateoo, 

I have a Predator 17 G5-793-747Z (december 2017) with the same components as yours. I was desperate to find a solution about critical temperatures : it reached 99°C twice and had an average of 92-96° on most of the games I play (Risk of Rain 2, Fortnite, GTA V, BF V, etc.) which is critical. I read a lot of suggestions to reduce those temperatures. Among these suggestions, I tried to undervolted my CPU, but nothing changed. 
My laptop still had warranty so I hesitate a little bit but finaly I tried to repast the CPU and GPU by myself. 

I had his motherboard changed by Acer for a sound issue that was unberable (just saying for what is following). When I opened it, it was a nightmare.
First I had one fane that was full of dusty things (I thought Acer would clean it while changing the motherboard but unfortunately not, they sent it back really dirty inside). Then, I unscrewed the cooler system and saw how bad was the thermal paste  applied. I completely understand how the paste reacts when a pressure is applied on it, but there was thermal paste everywhere but on the CPU and GPU. So I knew why the temperatures went that wrong so easily. Finally I applied the paste (Thermal Grizzly Kronaut I guess) following a great video made on the same laptop and I almost lost 30°C on average, playing with better graphics and better fps at the same time. The laptop is  silent as hell dudes. The max it reached was 76°C as well (I use Intel(R) Extreme Tuning Utility) and I do not use anymore the shortcut  to put the fanes on max speed, I let the laptop manage it. 

So I must thank you a lot, and I also recommend whoever meets this problem to repast AND to clean his fanes, it really changed my life and my laptop's one XD.

I had CPU temps rising over 90 for awhile (G5-973), but after cleaning vents with canned air everything vent back to normal (max around 80 C). So, just clean vents regularly and carefully. Temps should be fine after that.