Genuine Dell XX580, CP541, G261F Optiplex 960 Desktop DT Processor CPU 5-Pin Cooling Fan Heatsink Bracket/Shroud Assembly Compatible Part Numbers: XX580, CP541, G261F, WC236, G259F Brand: Dell Part Number: XX580 Type: Fan Heatsink Shroud Assembly Connection : 5 Pin Compatible Model: Dell Optiplex 960 DT