that's the temp it will throttle below the base clock speed, but you start losing your 'boost' clock at a lower temp. Nvidia's GPU Boost basically automatically overclocks the card based on available voltage and temps. my 2070 Super starts losing Hz at around 60c
you can counter this by using a more aggressive fan curve (with MSI Afterburner, or similar software). Nvidia's default fan curve is pretty weak, because they want the card to run quiet. you can set up a custom curve that makes the fans go faster at a lower temp. the drawback being the card will make a lot more noise. I have mine setup so the fans hit 100% at 70c, and my card never goes above 65c
So I did play around with MSI...and I see why nivida set the fan for 42 % unless the card hits 87
Once I got it to 45 shyt was OBNOXIOUSLY loud
...I could hear it over the game
...
I cranked the fans up to 55% and I thought my PC was going to take off like a plane or some shyt
I set the fans to 70 and HOLY shyt
...it was so loud I could hear it on the opposite end of my house on the 1st floor
I'm only going to have this card for a year and a half so I am probably just going to let it run at default...
Cranking the fans to 55% did bring max temps down from 82 to 66 though...the noise just isn't worth it