I don't posted anywhere test results, but there is 3dmark result file (fire strike extreme stress test), or you can find a screenshot below: https://www.dropbox.com/s/83pad8szhpmm5yu/nh-u9s.3dmark-result?dl=0
Edit: The room temperature is around 23C
Yes, I think you need to make a custom air duct, so the 120mm fans extract trough gpu heatsink.
I used a plastic cover to make the air duct all around the heatsink, between case's bottom and heatsink's bottom, so almost all exhaust air go trough gpu.
What is behind:
wow thanks! such great insightNow I get it
Personally that wouldn't work as there be no room for my 3.5inch Hard drive and SSD plus it would ruined the aesthetics and im getting similar temps with higher noise db.
HOWEVER YOUR A GENIUS I dont know why never thought of an aird duct or read it somewhere, maybe a custom printed one would go nice with that Artic acceloro heatsink
Here are some pics of my system i will make a vid later of all my testing as its several months worth.