Laptops tend to have a more slow/jet engine curve than desktops for cooling.
They have very slim fans, often they are smaller and spin at higher speeds.
It can get quite annoying.
A Core i7 CPU should be able to handle 75 Celcius, above that the CPU will throttle back to avoid self destruction from overheat.
Practically every processor since the Intel Pentium III includes this technology, including the Athlon 64 and other AMD processors.
It is more likely your GPU is pulling a large amount of power and needs to dissipate the heat quickly, so the fan spins up.