remember, what the above poster said about keeping the air pressure inside the case positive, ie more air being forced into the case than being exhausted. I had an even count of fans venting in and exhausting out. When i added one more pulling air in, my temps dropped 4-5 degrees.
but also what others said about upgrading the cpu cooler - the intel cooler is way too weak to be effective on the 4790K
and last, find and download a reliable temp monitoring utility, (RealTempGT, HWmonitor) - i ran my computer using ASUS's "performance utility" and it never showed my cpu above 67C - Then i downloaded RealTemp and it showed 95 - 100C, and so did a couple of other's - i'd been rendering video files (fairly intense cpu load) for 3 months, i mean 1.5 - 3 hr rendering times, thinking my cpu was way in the safe zone, only to learn the asus utility was reporting falsely.