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
GPU Backplate Cooler Heatsink With 2XFan Radiator For RTX 3090 3080 Series Card | eBay
WOVELOT GPU Backplane Radiator for RTX 3090 3080 3070 Series Card Backplate Memory VRAM Heatsink Cooling Fan PWM 1mm: Amazon.co.uk: Computers & Accessories
Graphics Card Backplate Heatsink Memory Cooler for RTX 3090 3080 3070 Series UK | eBay
Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
I added some VRAM cooling on my 3090 to fix issues I was experiencing during ML. : r/nvidia