Dell Precision T5500 Workstation Second 2nd Processor CPU HeatSink + Riser Assembly F623F W715F W567F F306F Processor Compatibility: X5690, X5675, X5660, X5650, E5645, X5687, X5647, E5620, E5607, E5606, E5603 Memory Compatibility: DDR3 1333Mhz Manufacturer: Dell