Amazon.com: GPU Backplate Memory Radiator Aluminum Heatsink Cooler with Dual 70mm 4Pin PWM Cooling Fan and 1.2mm 7W Thermal Pad for Graphics Card RTX 3090 : Electronics
Cooler for the EKWB backplate for the EVGA 3090 FTW3 Ultra by Empiricus | Download free STL model | Printables.com
RTX 3090 Active Backplate Cooling Solution w/ Thermal Pads + Heatsinks + Fans - Album on Imgur
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