Gaming at nvidia recommended settings gives me constant 80°C

That does seem a tad high on both counts; even my i7 6850K@4.7Ghz (1.1Ghz overclock from stock) idles @32C for the entire package and 29C max for individual cores. Have you tried with the side of your case off? Also what is the ambient temperature in your room? Do you live somewhere very hot? You could set a custom fan profile using MSI Afterburner and see if that helps: https://www.guru3d.com/files-details/msi-afterburner-beta-download.html.

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rawfiul

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i do live in a hot zone. its 35 degrees plus here. and i have already made changes to fan curves from gpu software
 


Well that could be it if your room is warm then it will definitely affect your hardware temps. I remember in Africa I had to undervolt and underclock my CPU to keep it from thermal throttling; once back home I could put it back to stock and fine.
 

rawfiul

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how to undervolt and underclock?
 


I used the bios for my desktop computer (basically the opposite of overclocking) with an i7 6700 and I use the Intel Xtreme Tuning Utility (XTU) for my laptop i7 6820HK.