Originally Posted by doyll
What others have said pretty well sums it up .. although I'm not sure 3x front intake fans with good pressure and airflow ratings can supply all the airflow needed for GPU's 3x 80mm/90mm fans and 120mm fannned radiator. I would remove all PCIe back slot covers
to increase rear vent area around GPU and monitor airflow temp into GPU and radiator. You might find below link is to guide of how airflow works and how to optimize case airflow of interest.
This turned out to be a fantastic piece of advice. I went ahead and removed the PCIe slot covers, four of them, and my temps started to drop dramatically. Apparently, I just wasn't getting good ventilation out the back, probably due to the 120mm radiator installed in the rear.