I 100% agree on needing to change thermal pads on 3080s and 3090s. My founders editions run so hot out of the box I could not even get the max hashrate without crashing the cards. Once I changed the thermal pads once (first time was nerve-racking) I felt much better about it and the cards run so much cooler. There are quite a few good guides out there to help you along the way as well as some have posted.  I used the one below to change the pads on my 3080s.

https://willmnorris.medium.com/guide-to-nvidia-3080-fe-thermal-pad-mod-cf378339f7ac