Lenovo Memory Module 512MB, 0.5 GB, 1 x 0.5 GB, DDR2, 240-pin DIMM Lenovo Memory Module 512MB. Internal memory: 0.5 GB, Memory layout (modules x size): 1 x 0.5 GB, Internal memory type: DDR2, Memory form factor: 240-pin DIMM, CAS latency: 5, ECC