The Razer Blade has a 250 W PSU compared to Apple's 80-ish. It is possible to have a more powerful PSU in a thin laptop. I think Apple's pursuit of thinness is what's not allowing better GPUs ... or something.Maybe they are taking this GPUs because other dies chips like the 480 are more power hungry and don't fit in the thermal design or power supply of the new ultra thin MacBook Pro. Just saying.