360° View - Akasa Blue Aurora AK-966BL Heatsink Information on Frostytech's test methodology is available here.
The 120mm PWM fan on the Akasa Blue Aurora AK-966BL heatsink spins at 500-1500RPM and draws power from a standard 4-pin PWM motherboard fan header. It is backwards compatible with 3-pin connectors. The four copper heatpipes are 6mm in diameter and extend from the base up through all the 50 or so cooling fins. Each aluminum fin measures 0.3mm thick and is spaced 2.0mm apart from the next. The leading edges of the fins have a scalloped pattern cut into the metal, this helps to break up the fin array surface and decrease air flow resistance.
The Akasa Blue Aurora AK-966BL heatsink stands 149mm tall, the bottom-most fin is 38mm above the CPU socket for clearance of adjacent capacitors, chipset heatsinks, etc. The four 6mm diameter copper heat pipes are positioned side to side in the middle of the 11mm thick copper base block. The LGA775 mounting clip wiggles freely on the two screws which hold it in position. A dimple in the metal clip assures clamping pressure is applied evenly to the center of the heatsink. Spring tensioned screws maintain even force and prevent over-tightening.
The copper base of the Akasa Blue Aurora AK-966BL heatsink measures 35x35mm. Four 6mm diameter copper heatpipes are soldered to the top of the 3mm thick copper block. From the top of the heatsink you can see how closely the heatpipes are lined up in the 65x120mm sized aluminum fin. While this reduces air resistance, closely packing heatpipes together doesn't encourage conduction to a broader area. The heatpipes are positioned directly in the path of the highest velocity airflow from the fan however.