HP 405477-061 2 x 4GB RAM DDR2 PC2 5300 667 MHz ECC CL5 REG 2RX4 , M393T5160QZA-CE6Q0
HP 405477-061 4GB DDR2-667 PC2-5300 240-Pin RDIMM CL5 Dual Rank x4 ECC Registered Memory Module

HP 405477-061 2 x 4GB RAM DDR2 PC2 5300 667 MHz ECC CL5 REG 2RX4 , M393T5160QZA-CE6Q0
HP 405477-061 4GB DDR2-667 PC2-5300 240-Pin RDIMM CL5 Dual Rank x4 ECC Registered Memory Module