Well, the 620 isn't really that good of a cooler. (not real watercooling)
It might be the mounting, or the amount of paste you've used.
I turned the fan around to make it an intake. I have a 200mm fan at the top of my case that is sucking air out. and my front fan is still acting as intake, my 670 obviously sucks air out. now under load
cpu load - reached 52c but jumped down to 49c
mb - reached 45c which is slightly hotter.
gpu idles - 2c higher now.
gpu reached 62c under load with fans at 60-70percent.
the cpu temp benefits but the other components are running slightly hotter due to the 200mm fan's not forcing out or in fast enough air I believe.
If I make the front fan an exaust will that my my graphics card over heat because no fresh air going infront of it?