TahoeDust
KingEngineRevUp
I also want to let you know that a user over at Overclock.net measured the actual reading of the card and it can draw more than 450W.
https://www.overclock.net/threads/official-nvidia-rtx-3080-ti-owners-club.1791823/post-28835729
EVGA has come out and said that their cards are not read correctly by 3rd party software.
So keep in mind, you're more than likely drawing a lot more heat than you think you are. That may also be a reason why the deltas are higher.
490W vs your 320W 3080 Ventus is a 50% increase in heat, so imagine you were getting 13-15C before, that is 20-22.5C now.
But yes, definitely try to tighten the screws a bit more if you can.
Do you not worry at all about cracking the die when tightening down? How tight are we really wanting to go here. Is there a suggested number out there? I snugged them pretty well, but I do a bit of gunsmithing and have some nice fitting driver bits and a in/lb torque wrench. I could REALLY tighten them down if I wanted.
The standoffs, screws and boss (pad) height were already all engineered to a certain mounting pressure. That's what I did when I used to do electromechanical avionics in one of my past jobs.
I bottomed the screws out and my die is not cracked. I actually double washered the 4 screws too with extra plastic washers that came stock to make sure I bottomed it out.
The only reason I did this though is because I already know the EKWB puts "acceptable" mounting pressure. Not enough to crack the die.
This took retorque the card 3 times to double check to not crack the die. I didn't just go crank it down the first time.
Lastly, ymmv. I'm not responsible for anyone else here double washering and they end up damaging their card. I'm just reporting what I did to get the best deltas I can with this WB.