The Praeton is a low-profile CPU cooler from Xigmatek. It is only 1.8 inches (45 mm) tall and has four heatpipes in direct contact with the CPU. Check it out!
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"The Xigmatek Praeton, a CPU cooler aimed at SFF (small form factor) computers, is only 1.8" (45 mm) tall. It has four heatpipes with direct-touch base configuration. Let's test it!"