Lenovo Intel Xeon E5503, Intel® Xeon® 5000 Sequence, Socket B (LGA 1366), 45 nm, Tray, E5503, 2 GHz Lenovo Intel Xeon E5503. Processor family: Intel® Xeon® 5000 Sequence, Processor socket: Socket B (LGA 1366), Processor lithography: 45 nm. Market segment: Server