Just to add my two cents here. I also own one of those predator helios 300 and it did run quite hot while gaming. I've been through lots of forum posts with quite some different solutions, such as repasting, undervolting, and so on... but one idea in particular was different. There was one guy who suggested to turn off the processor turbo boost, and he provided a script to help doing so.
I took this leap and well, it actually helped a lot. My Predator used to run at 88-92ºC while playing heavy games, and around 74-76-ish while playing some older games. After I turned off turbo boost it never went past 78ºC on any games, while it did maintain a very good performance on all of them, I actually couldn't tell if there was a noticeable difference at all on gaming performance.
I can provide the script if you're interested. Also, here's my benchmarking results on 3D mark before and after I turned off Turbo Boost: https://www.3dmark.com/compare/fs/17022905/fs/17022531
I may also add that I use this laptop for coding as well, and my compile times are still super fast even without the boost.
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