The 120mm fan on the Gigabyte Volar heatsink has big impeller blades
that are translucent, though it is not internally illuminated. With the
fan removed you can see the aluminum body of the heatsink, and the three
copper heatpipes which are embedded into it with thermal adhesive. The
opening at the center is 30mm round, the entire cooler 117mm
across. A grill protects the heatsink from sucking up errant wires.
Power is supplied by a 3-pin motherboard fan header, and a resistor may be
used to adjust speed from 2000RPM to 1500RPM.
Below the fins of the Gigabyte Volar heatsink is
33mm of space for adjacent motherboard components. Three 6mm diameter
copper heatpipes are soldered to the 5mm thick copper base. These pass
through the extruded aluminum heatsink and are bonded with thermal
adhesive. At the base the heatpipes are packed edge-to-edge to ensure good
thermal transmission. Each aluminum fin is 1.14mm to 0.75mm thick on
average, and spaced roughly 2.5mm apart. A thin ventilated aluminum shroud
wraps the aluminum extrusion, which is made of two stacked pieces and is
35mm thick. The upper body is set at a 45° angle.