At it's core, Glacialtech have equipped the 136mm tall UFO V51 Silent heatsink with two 1600RPM fans surrounding a large aluminum fin array, and framed in by a plastic casing that acts like a shroud to duct air through it. The heatsink weighs 780grams and is compatible with both Intel socket 775, 1366 and the entire family of AMD socket 939/AM3 processors.