The orange fins which are purely cosmetic. And the super mega has a revised bracket design that allows it to mount 140mm fans. The black model also uses the same bracket as it can use 140mm fans as well.For 4.8 80C isn't to bad. Can you remember what you got (temp wise) at 4.5-4.6.
What is the difference between the super mega and the rev c? Is it just those orange fins?