Originally Posted by LAN_deRf_HA
Finger room is a plus. The thermalright archon is a good example of how you can get top performance without obscuring the whole board under the sink.
Actually the archon would be unusable on many boards as it is even wider (by 25mm, 30mm if you use their fans) than a prolimatech megahalem.
Thermalright just exchanged thickness for width and height.
some good images for comparing it.