3090 (Kingpin & others!) - Get that backside VRAM cool!
Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
3090 VRAM cooling project for Alienware R11/R12 (will probably work with any card if you have space) - Custom Loop and Exotic Cooling - Linus Tech Tips
EKWB) New Class of Cooling - Active Backplates for RTX 3080, 3090 Reference GPUs | TechPowerUp
GPU Backplate Cooler Heatsink With 2XFan Radiator For RTX 3090 3080 Series Card | eBay
tellaLuna GPU Backplane Radiator for RTX 3090 3080 3070 Series Card Backplate Memory VRAM Heatsink Cooling Fan PWM 1mm : Amazon.co.uk: Computers & Accessories
FYI - cheap RTX 3090 / 3080 backplate/VRAM cooling solution - Tech Support - Microsoft Flight Simulator Forums
RTX 3080 FE - Backplate Thermal Pad Mod | Page 3 | Overclockers UK Forums
Graphics Card Backplate Heatsink Memory Cooler for RTX 3090 3080 3070 Series UK | eBay