360° View - 3Rsystem Iceage 120 Boss II Heatsink Information on Frostytech's test methodology is available here.
The 120mm fan spins at 2200-1000RPM and draws power from a standard 3-pin motherboard fan header. The fan is held on by four rubber vibration absorbing posts which barely fit - the fan holes are 104mm apart but the upper part of the Iceage 120 Boss II heatsink is only 109mm high. What can end up happening is the rubber keys fall out from the fins. Its five 8mm diameter copper heatpipes, aluminum fins and base are all dark nickel plated. The aluminum fins measure 0.3mm thick and are spaced 1.8mm apart. The surface texturing on each fin consists of a very small dimple popping out on both sides of the metal.
The 3Rsystem Iceage 120 Boss II heatsink stands 152mm tall, the bottom-most fin being 38mm 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 where they intersect the aluminum fins above. The base incorporates a 9mm thick aluminum section to provide support for clamping, with small extruded fins above for a little extra cooling surface area.
Looking at the 3Rsystem Iceage 120 Boss II heatsink from the top it resembles the Batman symbol a little. More significantly, the pattern of heatpipes passing through the aluminum fins helps to ensure equitable heat conduction across a broader area that is largely in the path of the fastest moving air from the 120mm fan. The base of the heatsink is very large, measuring 54 x 40mm in size. It's so big that an LGA775 Intel processor only makes contact with the center three heatpipes. CPUs with larger IHS dimensions see more benefit from the Iceage 120 Boss II's design, as evidenced by the AMD synthetic thermal test platform results.

Base Finish and Flatness

Flipping a heatsink over to inspect the business end is often a simple indicator of overall cooler quality. More practically speaking, a heatsink is in many ways only as effective as the contact it makes with the processor - the flatter and smoother the better. Base finish is one of the criteria that Frostytech measure in the course of evaluating heatsinks, and it involves two distinct aspects. Surface Finish is the first; this is calculated with the aid of Surface Roughness Comparator that has a cross section of common machine surface finishes and their numerical surface roughness equivalents in microinches. The second is Surface Flatness. This is tested with an engineers straight edge or proven flat surface, in two axis.

The 3Rsystem Iceage 120 Boss II heatsink has a surface roughness of approximately 32 microinches, which is considered good. The base is machined perfectly flat in both axis, but has a slight grooved finish from the tooling. The copper and aluminum parts are flush. Sound level measurements are coming right up next.