ADATA 512Mb, DDR2-667, (PC2-5400), CL5, 0.5 GB, DDR2, 667 MHz, 240-pin DIMM ADATA 512Mb, DDR2-667, (PC2-5400), CL5. Internal memory: 0.5 GB, Internal memory type: DDR2, Memory clock speed: 667 MHz, Memory form factor: 240-pin DIMM, CAS latency: 6