GPU Backplate Heatsink With Dual Fan For RTX 3090/3080 VRAM Temp - YouTube
GPU Backplane Radiator for RTX 3090 3080 3070 Series Graphics Cards Backplate Memory Heatsink Cooling Fan Cooler Aluminum Alloy Anodized CNC - Walmart.com
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
Keeping that RTX 3090 junction temp down with my custom pure copper backplate and heatsink, so far so good. No throttling. : r/EtherMining