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
FYI - cheap RTX 3090 / 3080 backplate/VRAM cooling solution - Tech Support - Microsoft Flight Simulator Forums
MOD ZOTAC GAMING RTX 3090 TRINITY GLUE HEATSINK TO BACKPLATE VRAM TEMP NO THROTTLE ETHEREUM MINING - YouTube
3090 (Kingpin & others!) - Get that backside VRAM cool!
EKWB) New Class of Cooling - Active Backplates for RTX 3080, 3090 Reference GPUs | TechPowerUp
GPU Backplate Radiator Dual Fan Heatsink for RTX 3090 3080 3070 Series Card | eBay
GPU Backplate Cooler Heatsink With 2XFan Radiator For RTX 3090 3080 Series Card | eBay