I haven't had a chance to do any overclocking yet, but after running Heaven 4.0 overnight my max GPU temp was 40c.
I may post some benchmarks if anyone is interested, but I don't have a lot of free time, so please be specific about what you want benchmarked 
Original Specs:
CPU: Core i7 5960x (overclocked to 4.3ghz)
Motherboard: Asus Rampage V Extreme
RAM: 32GB (4x8GB) 2400mhz G.Skill Value Memory
Main Storage: 2x512GB Samsung 850 pro
Video Card: XFX HD 7970
Case: Phanteks Enthoo Primo (Black Edition)
PSU: Corsair AX1200
OS: Windows 7 Ultimate (x64) SP1
Cooling: Custom Liquid Loop (see partpicker list)
Final Partpicker List: http://pcpartpicker.com/user/awettree/saved/xVBzK8
