I have one Corsair af 140mm fan and the stock fan of the case as an intake on the front side of the case. As an exhaust I have one corsair af 120 and one corsair sp 120 on the top of the case and one sp 120 on the back.

In order to keep the temperatures below 105 degrees, if I use blender, I have to make the fans work at full speed, which gets quite loud. And it can reach 105 degrees in less than half an hour. I haven’t tested it for longer. My pc also shut down once when I played a game right after a cpu stress test. I have the r9 390 which produces quite a lot of heat and it probably heated the vrm coolers a lot (or at least I think that’s what happened).