4GB (2x2GB Kit) PC5300 667 MHz CL5 ECC DDR2 RDIMM
IBM Memory Kit 4GB (2x2GB), 4 GB, 2 x 2 GB, DDR2, 667 MHz
IBM Memory Kit 4GB (2x2GB). Internal memory: 4 GB, Memory layout (modules x size): 2 x 2 GB, Internal memory type: DDR2, Memory clock speed: 667 MHz, CAS latency: 5, ECC