2GB, 667MHz, PC2-5300F-5, DDR2, dual-rank x4, 1.50V, registered, fully-buffered with ECC, dual in-line memory module (FBDIMM) - Part number is for one 2GB DIMM
HP 398707-051, 2 GB, 1 x 2 GB, DDR2, 667 MHz, 240-pin DIMM
HP 398707-051. Component for: PC/Server, Internal memory: 2 GB, Memory layout (modules x size): 1 x 2 GB, Internal memory type: DDR2, Memory clock speed: 667 MHz, Memory form factor: 240-pin DIMM, CAS latency: 5, ECC