Lenovo ThinkCentre 2GB PC2-5300, 2 GB, DDR2, 667 MHz, 240-pin DIMM Lenovo ThinkCentre 2GB PC2-5300. Internal memory: 2 GB, Internal memory type: DDR2, Memory clock speed: 667 MHz, Memory form factor: 240-pin DIMM, CAS latency: 5