First off I'd like to say how quiet this CPU cooler is in action, in my Zalman 11 plus case, Gigabyte motherboard and AMD Phenom II X4 965 and ATI 6870 I was getting a bit annoyed with the drone of my Zalman CNPS9900 MAX, it looks great but it is too noisy.
The Be Quiet Dark Rock Advanced C1 is big, very big and rather heavy but it is extremely efficient and extremely quiet, after running a few videos whilst playing Foobar flac files the processor was only 35 degrees, with the Zalman it would hover around 47 degrees but you could hear the Zalman! The Dark Rock is silent in comparison and whilst it may not have the blingly LED's i looks really nice and is very well finished.
Fitting the fan wasn't easy as I left my mobo in the case to do so but it was a lot easier than the Zalman to fit, there are a great range of fittings that cover just about every processor socket/motherboard made in the last five years. The main difference when fitting to an AMD platform as opposed to an Intel version is the heatsink and fan must be installed vertically, i.e, the fan either faces down or up.
With an Intel board you can install the fan facing the rear of the case which is preferential but as long as you have a fairly decent air-flow in the case this arrangement should't prove detrimental in any way. The upside of having the heatsink mounted vertically is the 'Be Quiet' logo is the right way up!
I wholeheartedly recommend this CPU cooler regardless of its size and mounting arrangement as the performance and build quality more than outweigh any minor niggles, as long as your case can support a 165 mm tall cooler then get this now!