HP Intel Xeon E5503, Ref, Intel® Xeon® 5000 Sequence, Socket B (LGA 1366), 45 nm, E5503, 2 GHz, 32-bit, 64-bit HP Intel Xeon E5503, Ref. Processor family: Intel® Xeon® 5000 Sequence, Processor socket: Socket B (LGA 1366), Processor lithography: 45 nm. Memory channels: Triple-channel, Maximum internal memory supported by processor: 144 GB, Memory types supported by processor: DDR3-SDRAM. Market segment: Server. Intel® Virtualization Technology (Intel® VT): VT-d, VT-x