Original Intel Xeon 2U Passive Heatsink for Socket LGA771 Processors Intel Part Number D36871-001 FRJ Designed for For Xeon 5000, 5100 & 5300 Series with 667, 1066 and 1333 FSB. Including Xeon 5020, 5030, 5040, 5050, 5060, 5063, 5070, 5080. Genuine Intel Part Number: D36871-001 FRJ