The Glacialtech Igloo 5610 PWM is a compact LGA775 Intel heatsink suitable for office work computers. It's 80mm fan is Pulse Width Modulation compliant, so Intel motherboards can direct it to spin only as fast as required (from a low 800RPM to moderately audible 3200RPM), thus keeping unnecessary noise down. The Igloo 5610 PWM is comprised of two heatpipes, a small section of extruded aluminum heatsink and a short array of aluminum cooling fins. A very simple CPU cooler, and one that is priced in the $10-$15 range making it cost effective for office PCs.
Glacialtech's Igloo 5610 PWM heatsink weighs just 373grams, and in Frostytech's real world tests ranges from 45.4 to 59.5 dBA in noise output. The heatsink stands 100mm tall, and ships with a pre-applied patch of thermal compound on its base.
The only odd thing with the Glacialtech Igloo 5610 PWM heatsink is the manufacturer's choice of using screw based clips. For a heatsink this lightweight, we would have expected the standard Intel push-to-click plastic retention mechanisms used with the reference heatsinks. Instead with the Igloo 5610 PWM we find four captive screws and a metal motherboard support bracket which necessitates removing the board from the PC chassis. For a heatsink that weighs 373grams, that comes with pre-applied thermal compound, and that is best suited towards generic office PCs, this isn't a smart choice.
For system integrators, or industrial PC applications a screw based heatsink retention mechanism fits the bill. Perhaps that is the intended application here... For the time being, all Frostytech is interested in is how the Glacialtech Igloo 5610 PWM heatsink performs thermally. Let's begin the analysis.
The Glacialtech Igloo 5610 PWM heatsink is a pretty straightforward CPU cooler, but after removing the 80mm PWM fan we can have a look at one of its more unique qualities - scalloped cooling fins. Seen from the top down, the leading edge of each aluminum fin has a little wavy pattern punched out of it. This helps break up laminar air flow and decrease back pressure as the air exits the fan and proceeds through the array of aluminum cooling fins which are press-fit around the heatpipes. The heatpipes are soldered to the copper base, but not each individual aluminum fin.
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!
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