+1^ to what everyone said including the Veyron
Anyways installing the Kuhler 620 was a pain for me as well, I bet we got the new batch without the coloured pieces found in the old one. When I screwed mine in, one side would always pop out of the screw hole and so I applied so much force I felt like I was going to break my motherboard or something. In addition, the Kuhler 620 is not a high end cooler, in fact the Hyper 212 EVO performs just as good.
However I noticed switching my fan to intakes on the radiator lowered the temperatures by 5-7 degrees.