I tried to comment on your first post but didn't have enough karma to do it apparently since I'm newish to reddit. Anyways! Copy pasta!

I have the exact same card and waiting on all of the pads to be delivered. As far as I can tell, everything on the front side, aside from the memory modules, is 1mm. Memory is 2mm, and I have yet to take off the back plate but it looks to be 3mm. I already replaced the front side original pads with what I had laying around, layered 1mm pads for the front side memory and different sized pieces of 1mm for the power modules. Not the best case at all but still better than the stock pads they had on it. And put a small heat sink with a fan on the back plate for now with thermal tape around the edges and MX4 paste in the middle. A little messy taking it off but so far this has made the biggest difference of about 10-12C. Also removed the stock fans put NF-A12x25's on the radiator and saw a small improvement, maybe 1-2C but completely silent. If everything arrives on time, I'll be doing all of the pads from scratch tomorrow.

Getting around 90 mhz hash rate while keeping the memory at a constant 88C since this card is primarily for gaming. Core is ice cold at 38C. 825mhz core at 731mv, +700 mhz memory and 71PL and radiator fans at 100% (can't hear them though)

Heat sink: https://www.amazon.com/gp/product/B00006B8EX/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

Thermal Tape: https://www.amazon.com/gp/product/B072JJD2ND/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

Pads I'm going to try:

https://www.amazon.com/gp/product/B08SKWFR1B/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B08GSCJ5W1/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B00UYTTXSM/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

Also, best reference video I can find. Pretty sure the 3080 and 3090 use the same AIO
https://www.youtube.com/watch?v=yI7LgWSIuUI&t=816s