Hmmm, i think that you're supposed to disable a few safety checks and up the voltages. I'm not an expert and since it's a lappy, it's a bit more tricky.
In there some where there's(that i know of) a CPU, Motherboard and internal heat sensors, fail safe to prevent ur comp from melting in case of overheating.
IF im not wrong, step 1 involves disabling those fail safe, THEN you up the voltage. But if its a lappy (Chances are base on the model, it's a poly lappy.), it already have a heat issues. I think you also can save BIOS setting too, since i dont think you can flip the CMOS jumper if you did something wrong.
There's a limit OEM heatsink/fans can do though, look out for the "usual suspects"(I.E blue screen of death.

).
Why u wanna overclock ur gpu, lappy some more? Playing GRAW2?
