The 120mm fan on the Spire Thermax II heatsink spins at 2200RPM by default. The supplied fan speed controller can drop that down to 1000RPM if quieter operation is desired. A standard 3-pin motherboard header provides power. Note the AMD K8-style mounting clip attached to the aluminum base block, this one clip allows tool-free attaching to both Intel and AMD processors.

The Spire Thermax II heatsink stands 155mm tall. Its raw aluminum fins are press-fit over the four 8mm diameter copper heat pipes that are packed tightly together. The bottom fin is elevated 39mm for adequate motherboard component clearance. The aluminum fins measure 0.3mm thick and are spaced 2.0mm apart. The aluminum/heatpipe base is 10mm thick.

The base of the Spire Thermax II heatsink is machined flat, with a slight ridged texture. The portion of the base that comes in contact with the CPU measures 46x41mm, about 8mm (x4) of that is pure copper heatpipe. Four 8mm diameter U-shaped copper heatpipes run the full height of the 155mm tall heatsink. Each aluminum fin is roughly an "X" of 120x74mm in size.