EXHardware checks out the Bitspower NP60CD hsf. It's a pretty good unit, check
out what they thought here.
Both the coolers feature a wavy fin design which is unique to Bitspower.
Wavy fin designs, when done correctly, can increase the effective surface area
of the heatsink and from the looks of it, Bitspower is doing a pretty good job
here. The NP60CD came bundled with Arctic Alumina thermal compound while the
NP81DS20 came with the standard white thermal compound bundled with most coolers.
Bitspower did not include any installation instructions or documentation with
the coolers, in fact the NP81DS20 didn't even come with a box but it could have
just been our unit.