The 120mm fans spin at 2200RPM and draw power from standard 3-pin motherboard fan headers. One fan can be installed on each side of the Thermax Eclipse. Four rubber vibration absorbing posts are used to hold the fans, however this ends up spacing things further apart than the length of slots in the aluminum fins so they easily fall out. The 8mm diameter copper heatpipes rise up through dark nickel plated aluminum fins which have a dimpled surface texture on each side. Fins measure 0.4mm thick and are spaced 2.0mm apart.

The Spire Thermax Eclipse II heatsink stands 155mm tall, the bottom-most fin is 40mm above the CPU socket for clearance. The five heatpipes are positioned side to side where they make direct contact with the processor, and expand outward to form an X-pattern through the aluminum fins. The base incorporates a 10mm thick aluminum section to provide support for clamping, with a further 10mm of extruded fins for a little extra cooling.

Looking at the Spire Thermax Eclipse II heatsink from the top you see the dimpled aluminum texture and dark nickel plating which picks up fingerprints like mad. The X-pattern of heatpipes helps to ensure equitable heat conduction to the location receiving the most airflow from the fan. The base of the heatsink measures 41x54mm in size, featuring five exposed copper heatpipes. Intel processors only make contact with the center three heatpipes.