HEATKILLER IV PRO CPU Water Block has up to 3C temperature decrease compared to its predecessor Real high flow design: higher flow performance - thanks to bigger jet structure and receptacles Improved reliability: cooling structure without jet plate, jet directly integrated into the cooler now Socket compatibility AMD 939, 940, AM2, AM2+, AM3, AM3+, FM2, FM2+, AM4 Improved fittings compatibility: 16/10 and 19/13 fittings possible