I didn’t - but a heat sink without a fan isn’t going to do a lot of good, especially that small. I believe the guy who posted the original (https://www.norbert-the-great.com/index.php?entry=Solved:-RTX-3090-VRAM-Overheating) did post his numbers and they weren’t great. Even a case fan blowing crosswise would be better than nothing - or you could try these - I’m a big fan of Arctic, and they’re only 15mm thick.
ARCTIC P12 Slim PWM PST - 120 mm Case Fan with PWM Sharing Technology (PST), Pressure-optimised, Quiet Motor, Computer, Extra Slim, 300-2100 RPM - Black https://www.amazon.com/dp/B08QDKGCCW/ref=cm_sw_r_cp_api_glt_fabc_GJ6R75EGRY8THTH7FZK4