Really though, the most notable benefit of the Coolermaster Hyper48 heatsink is its quietness. The low noise output is due to a specialized Delta fan which has side vents and a conservative impeller speed. The 92x92x25mm Delta NFB0912L fan moves 42CFM of air whilst generating just 29.1 dBA noise, according to the mfgr's spec sheet. Curiously though, Coolermaster have listed a fan speed of 1400RPM while Delta quote a 2100RPM value.... in either case the KHC-L91 heatsink operates quietly in the real world. Our ears can appreciate that.

Coolermaster KHC-L91 Hyper48 Heatsink

heatsink specsheet manufacturer: coolermaster model no.: hyper48 khc-l91 materials: copper fins, base and heatpipes. fan mfg: delta electronics nfb0912l fan spec: 1400rpm, 12v, 0.17a fan dim: 25x92x92mm heatsink & fan dim: 105x94x70mm weight: 864 grams includes: multi-socket back plates, k8 hsrm, mounting hardware and clips, thermal compound Compatible with Sockets: 478/775/754/939/940 Est. Pricing: $28USD ($32CDN)

The Coolermaster Hyper48 heatsink is flexible when it comes to the different CPU heatsink retention methods of AMD and Intel. When it comes to LGA775 Pentium 4 CPUs a special bracket screws into the copper base of the heatsink which makes it possible mount the unit onto these kinds of motherboards.

The other CPU types rely upon a hybrid K8/P4 heatsink retention frame. Given that we're dealing with a 864 gram copper heatsink, whatever method applies to your computer it's important that the Coolermaster Hyper48 stay firmly in place once installed!

The heatsinks' four copper heatpipes run along the upper side of the copper base, and then intersect the copper fins at the top right where cold air from the fan enters. To ensure a good thermal interface with as little thermal resistance between the joints as possible, the two sections of copper fin and heatpipe are soldered together.