Cooler Master Seidon 240M: Dual Fan Liquid CPU Cooler

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The Cooler Master Seidon 240M (minus the fans) is composed of a 27.3 x 11.9 x 2.7 cm or 10.8 x 4.7 x 1.1 inch (L x W x H) radiator with 13 aluminum coils, two 30 cm long, 8 mm thick plastic hoses, and a 27 mm thick waterblock/pump with a large copper base. Altogether, the unit weighs 650 grams or 1.4 lb.

The heat dissipation cycle begins with a 51 mm diameter copper waterblock clamped to the processor. The surface has a dull finish and a convex shape like a shallow mound to ensure good contact with the center of the CPU heatspreader. Coolant is circulated through this 27 mm thick structure by the pump encased inside, and powered using a 3-pin fan cable.

The liquid travels through 30 cm of 8 mm thick hard plastic tubing to the radiator, transferring the heat to its aluminum coils. The fluid inside can be replaced through a cap but removing it voids the warranty.

The radiator is designed to mount to a dual 120 mm case fan position, commonly found on the top panel of many tower style cases. The fans perform the final step of the cycle, expelling the heat out of the system.

The radiator coils are an anemic 0.10 mm thick, curled into seemingly endless rows that are easily damaged by light contact with any solid object. This is stifling compared to traditional air-cooled heatsinks that have long gaps between the fins.

The stock fan is a Blade Master, the same type used on many Cooler Master heatsinks including the Hyper and GeminII series.

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