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This item, 437939-B21, is the HP retail number for the product described as Quad-Core Intel Xeon Processor X5355 (2.66 GHz , 120 Watts, 1333 FSB). Further details below.HP Option Part #: 437939-B21
HP Spare Part #: 438363-001
Assembly Part #: 432231-001
Last Updated: 4/27/2016