What is the difference between a fade and a power fade?

I was playing the other week with a guy who is a good golfer, but he was having a bit of a nightmare. He had been told to do a power fade by his teaching pro, and was generally struggling with where his hands were within the swing. Now I am a bit of the opinion that playing the fade is generally for a right hander something you should only do if the movement is small and its your bread and butter shot. To actually seek it out when you play a relatively straight to draw shot seems mad. But I don't understand how it is a power fade and not just a fade, is there some swing differences?
Also at my course there is more trouble right than left... Having enjoyed a few snap hooks of late I can say they have had very little affect on getting to the green but the blatant block or slice out right has had me well and truly stuffed!!