I also added the heatsink on the top of the PSU as others did Noisy PSU fan - #607 by k_peter_06
And a heatsink at the bottom, this 3D print project here Desktop PSU noise fix - #7 by k_peter_06
With these heatsinks, together with the front 80mm front fan and my 2 USB fans, I think I achieved peak FW Desktop cooling lol.