When I first installed my N520 I was worried that I wouldn't be able to install the ram as the fan extended over the slots... but I held my tongue just right and got them in without having to remove the cooler and reinstall. But the fitment in my CM690 is so close to the side intake fan that if you push in on the side of the case the copper tube tips rub against the blades... like 1/16th of an inch space, but just enough lol.

Glad you got it running right and a good start to overclocking. My 565 was a standard 3.4 as a dual and with the core unlock turning into a quad I haven't (yet) found a need to push it any, but supposedly on air cooling, unlocked, testing showed it could push to a 3.8-4.0... but I am nervous about pushing it that far. That's a big jump and it is my main machine. Don't want to compromise stability when I don't really need to.