360° View - Arctic Cooling Freezer 13 Pro Heatsink Information on Frostytech's test methodology is available here.
The 120mm PWM fan spins at 1350-900RPM and draws power from a standard 4-pin PWM motherboard fan header. The 50mm base fan shares the power connection. The fan is integrated into the plastic fan shroud so changing fans is not possible. Four 8mm diameter copper heatpipes rise up through 117mm worth of raw aluminum fins. Each aluminum fin measures 0.4mm thick and is spaced ~2.0mm apart. The heatpipes are alternatively offset 4mm to break up the line and spaced 80mm on center.
Arctic Cooling's Freezer 13 Pro heatsink stands 159mm tall, the first fin is elevated 37mm above the CPU socket. The four copper heatpipes are positioned side by side at the base and soldered to a 1.8-5mm thick copper base plate. Note the 50mm 'cross blow' fan at the base of the heatsink.
The copper base plate on the Arctic Cooling Freezer 13 Pro measures 39x32mm in size and is supplied with MX-4 thermal compound pre-applied. From the top we can better see how the heatpipes are slightly offset to break up the row. Heatpipes are positioned in the region of highest airflow from the fan.

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 copper base plate of the Arctic Cooling Freezer 13 Pro heatsink has a surface roughness of approximately 32 microinches, which is considered good. The base has a machined and wire brushed or sanded surface finish that is perfectly flat in one axis and very slightly convex in the opposite. Shown are the heatsink base (top) as shipped and after the pre-applied thermal compound has been removed (bottom).

Next up, Frostytech heatsink sound level measurements...