Lenovo 512MB PC2700 DDR Memory for ThinkCentre, 0.5 GB, DDR, 333 MHz, 184-pin DIMM Lenovo 512MB PC2700 DDR Memory for ThinkCentre. Internal memory: 0.5 GB, Internal memory type: DDR, Memory clock speed: 333 MHz, Memory form factor: 184-pin DIMM, CAS latency: 2.5, ECC