Lenovo Memory 1GB PC2-4200 DDR2 SDRAM UDIMM, 1 GB, DDR2, 533 MHz, 240-pin DIMM Lenovo Memory 1GB PC2-4200 DDR2 SDRAM UDIMM. Internal memory: 1 GB, Internal memory type: DDR2, Memory clock speed: 533 MHz, Memory form factor: 240-pin DIMM, CAS latency: 4, ECC