I watch YouTube all the time and sometimes watch BBC iPlayer full screen and my MBP's fans don't become noticeable. I'm not in the habit of watching Activity Mo

I watch YouTube all the time and sometimes watch BBC iPlayer full screen and my MBP's fans don't become noticeable. I'm not in the habit of watching Activity Monitor without cause. I do recall that my previous MacBook (the first plastic C2D one) used to peg the fan(s) quite often. Maybe things vary a bit by what graphics chipset is available.