yesterday I tried playing Remember Me with everything at maximum, including the monstrous supersampling. I was getting 35 fps with some dips below 30 so I decided to overclock a little and using MSI afterburner I set +135MHz to the core and +450 to memory clock and got 45 fps in the same environment. That is a nearly 30% increase, and the maximum GPU temperature was 72°C. So the 770M is very easily overclockable and the G750's cooling system remained unimpressed despite that.
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ASUS G750JX -- i7-4700 - 16GB - 128GB 840 PRO SSD + 1TB HDD - Nvidia GTX 770M - 120Hz 3D glossy display