Built to replace an aging i7 860 gaming system from 2010. (ver.1 - Pictured)
Went through different versions of this build after upgrading from a GTX 970 (from the 2010 system) to a GTX 1080. (ver.2 - Not Pictured)
After upgrading to the GTX 1080, I noticed that the GPU was running a bit hot (76-78c, GPU Fan 78-83%) and the GPU fans were spinning at a higher / louder rate. While looking into the issue, I noticed that the temp. on the GPU dropped while the case was on it side (my thinking was the intake on the bottom started getting better air flow). I ended up replacing the Corsair H100i v2 for the Corsair H80i v2 to help bring in cooler air to the GPU by adding a Corsair 140mm AF Q.E. fan to the front of the case in addition to the 120mm fan (Stock Fractal Fan) from the bottom of the case. (ver.3 - Pictured)
Still not happy with the internal temp (72-74c, GPU Fan 68-76%). I ended up picking up a Corsair ML120 case fan to replace the fan (Stock Fractal Fan) in bottom of the case to help bring in more air from the bottom of the case to the GPU. It didn't seem to help with the internal temp which seem to just be building up in the case. I eventually moved the ML120 to the rear to help exhaust out the heat and moving the Corsair 120mm AF Q.E. to the bottom of the case and using a PWM splitter with the 140mm AF Q.E..
GPU temp. while gaming now stays around 68c while the GPU fans spin around 55%. (ver.4 - Pictured).