Awesome man, glad that info helped! I built some air direction duct (maybe more like a fin) to take half of the air flow from my 170 mm side panel fan and push it directly to my 2 gpus, they sit within 1C of each other now, unless F@H is running on one, and it made a big difference in my gaming. I made out of manilla folder material to get the shape right then flat blacked it until I make the final out of better material.
Also, set up a fan profile in Afterburner, you won't be disappointed. Mine below.