Stock fan was getting loud due to malfunction in GPU fan controls. Needed something quiter and so mounted 120mm case fan to it. Fan can be driven full blast continuously or connected to motherboard for speed control.
Fan adapter connects to heatsink with stock fan screws.
Connect adapter to heatsink frist then add 120mm fan on the adapter with case fan self tapping screws.
I'm no airflow engineer so airflow efficiency is probably crap.
The author marked this model as their own original creation.