HP 1GB Registered PC2-5300 2x512MB DDR2 Memory Kit
HPE 408850-B21, 1 GB, 2 x 0.5 GB, DDR2, 667 MHz, 240-pin DIMM
HPE 408850-B21. Internal memory: 1 GB, Memory layout (modules x size): 2 x 0.5 GB, Internal memory type: DDR2, Memory clock speed: 667 MHz, Memory form factor: 240-pin DIMM