I did the 3090 FE thermal pad mod and it went very well, near 30 degree drop for the memory and even some gains on the core with Arctic MX-5 : r/nvidia
T.V. EVGA GEFORCE RTX 3090 Ti FTW3 BLACK GAMING 24GB GDDR6 (24G-P5-4981-KR)
NVIDIA GeForce RTX 3080 Ti 12 GB, The Ultimate Ampere Gaming Graphics Card Official - As Fast As RTX 3090 For $1199 US
GeForce RTX 30 Series Graphics Card Overview | NVIDIA