Quiet heatsinks have soared in popularity as manufacturers have been forced to develop more efficient designs which cool better, quietly. There is now no reason why you should have to associate a quiet heatsink with under whelming thermal performance.

The fan frame features a series of four 1.5mm x 32mm slits cut from what would normally be a solid surface. The slits allow air to be drawn in by the impeller at different locations, with the end result being a slightly lower pitch of sound from the 2450RPM fan.

Below the fan rests the 41 sets of very thin copper fins which are soldered to a 6mm thick copper base. The copper fins are attached to one another by means of small folded tabs placed in different locations.

This is a pretty standard construction method that has been in use by many heatsink companies for a several years with good results. The folded fin assemblies allow the manufacturer to build thin-fin, high aspect ration fin assemblies that A. would not be possible with typical extrusions, and B. would not otherwise be possible in copper to the same quality of fin-to-fin spacing.