360° View - Glacialtech Igloo 7321 Silent E Heatsink Information on Frostytech's test methodology is available here.
The 80mm fan rotates at a fixed speed of 2000RPM, with power being supplied by a 3-pin fan header. It is not PWM compliant. The extruded aluminum body of the Igloo 7321 Silent E heatsink is dead simple. The clip uses a cam to apply the appropriate pressure to the surface of the CPU below.
The extruded aluminum fins are 36mm high, while the fan is 25mm thick. Each aluminum fin is ~0.8mm thick, and spaced about 2.0mm apart. The base plate measures 7.0mm thick over the CPU. The clip is tool free and works with the center lug on socket 939 and AM2 heatsink retention frames.
The machined aluminum based of the Glacialtech Igloo 7321 Silent E measures 77x41mm in size, and comes with a pre-applied square of grey thermal compound. The base is good and flat. Compared to the similarly named Igloo 7312 heatsink, the Igloo 7321 above is 8mm wider at the top.

Next up are the acoustic tests, and then it's onto thermal testing!