FrostyTech's Test Methodologies are outlined in detail here if you care to know what equipment is used, and the parameters under which the tests are conducted. Now let's move forward and take a closer look at this heatsink, its acoustic characteristics, and of course its performance in the thermal tests!

360° View - Glacialtech Igloo 5610 Silent Heatsink Information on Frostytech's test methodology is available here.
	The Heatsink Fan: The 80x80x25mm fan rotates at a speed of 1800RPM and doesn't generate that much in the way of noise. The Glacialtech Igloo 5610 Silent draws power from a standard 3-pin motherboard fan header. The eleven-blade impeller doesn't have a wire fan grill protecting it, so make sure errant wires are well clear of the blades.
	Heatsink Top: Looking from the top down, the Glacialtech Igloo 5610 Silent heatsink has a compact profile that is 64mm deep. Two 6mm diameter U-shapped heatpipes poke out from the top on either side. The fan is attached to an aluminum fan shroud which wraps around the top of the cooler to create a small plenum in front of the raw aluminum fins.
	Heatsink Side A: Viewed from the side we have a better idea of how simple the Glacialtech Igloo 5610 Silent heatsink is. Two 6mm diameter heatpipes, a 62mm high section of aluminum fins, a small extruded heatsink below this and a thin copper base. Each aluminum fin is 0.31mm thick and spaced 1.2mm from the next. The fins are press-fit over the heatpipes, not soldered. Note the white cups which hold each of the four mounting screws.
	Heatsink Side B: From the rear the Glacialtech Igloo 5610 Silent heatsink presents an unimpeded route for air to flow through. The little extruded heatsink looks like something used on chipsets, it's essentially 50 x 21.5 x 37mm in size and forms the base of the entire cooler. Square recesses are machined in its base for the heatpipes to pass through, and on top of them is the copper base plate. Its fins are 0.75mm thick at the base, spaced 1.15mm apart.
	Heatsink Base: The base of the Glacialtech Igloo 5610 Silent heatsink consists of a small 34x32.75mm square of nickel plated copper base. The base is 2mm thick, but is soldered to the heatpipes and rest of the heatsink chassis. The base has a smooth surface finish with a roughness of ~16 microinches or better, and is quite flat. The heatsink ships from the factory with a pre-applied patch of thermal compound. Each for the four mounting screws is held captive in the little white cups so they won't fall out during the installation procedure.