SAMSUNG M393B5170FH0-YH9 4GB DDR3 REG ECC PC3-10600 CL9 512MBX72 256X4 1.35V 240PDIMM SAMSUNG M393B5170FH0-YH9 PC3L-10600R DDR3 1333 4GB ECC REG FOR SERVER ONLY - NOT FOR DESKTOP SYSTEMS