So... Basically, I discovered that under windows you can overclock the GT750M in the late 2013 15" Retina pros. That's cool, being able to achieve almost 20% increase in performance in games. I was however under the impression that as long as your overclocks are safe, stable, and within thermal limits without damaging any components, you could simply revert them back to default settings if you needed service under warranty from apple. Kind of like Jailbreaking and then restoring to a clean iOS if you need Apple's service. But now... I'm scared that I might have voided my warranty with an overclock. I researched it a bit and found ONE case where someone with a 17" Macbook pro was denied service because he had overclocked his CPU in order to speed up a rendering task. He said that they must have some sort of "trip" in the EFI (like liquid sensors) for system parameters such a clock speed and temperature, that tell whether or not the chips have experienced overheating or overclocking. So yeah, this is rather concerning to me, so I'm looking for any confirmation or experience from other users here. And if I've definitely voided my warranty, maybe I'll just go ahead and change the thermal paste now so that I can drop the temperature a couple degrees for the CPU+GPU. Thanks guys!