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
Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
GPU Backplate Radiator Dual Fan Heatsink for RTX 3090 3080 3070 Series Card | eBay