The Arkua 6149 turns out be a rather capable cooler for its size. While we didn't have access to other 1U HS/Fs for comparison (the CoolJag JAC311C comes to mind), the 6149 still puts up a show, besting the Spire 5P53B3 and coming up on the Mini Copper Orb - both heatsinks more than twice its size. In light of that, the Spire 5P53B3 currently installed in Project Numenor will be replaced by the 6149. However in the severely confined space of a 1U system, the efficiency of a HS/F unit also depends critically on the overall ventilation of the case. While the Arkua 6149 is a rather good unit, sticking it in a badly ventilated 1U case will not alleviate thermal problems much. Thus it is important to test run the server before putting it into its production environment, something you'll definitely want to keep firmly in mind.
