a 770M at stock cant handle the options on max max max man, try to reduce unecessary options like tesselation paralelax fxaa (blurry aa lol) and that stuff it will work waaaaaaaaaay better, also enable exclusive fullscreen mode
🙂ps : the turbo mode is automaticly enabled when thermals allows it (in your case : always)
laptops are always GPU limited anyway, more CPU freq. wont help..
Laptop : ASUS G750JW : i7 4700HQ - 16Gb - 2Tb HDD - GTX 765M OC (+135/500) - Full HD Matte - Win 8.1
Retiered : Toshiba L670 i5 560M/8Gb Corsair/1TB/HD5650 1Gb @ 625/800 /WD 1Tb USB3/Win7