DDR RAM: DDR RAM 400/ DDR 2 533/667/800 128MB-1G SDRAM Memory Module Measurement: (Length x Height x Width)(mm): 133.3 x 29.4 x 3.4 Weight: (g) 20.0 (PC66) 22.0 (PC100) 21.0 (PC133) Format: DIMM Storage Capacity: 128MB, 256MB, 512MB. Maximum Transfer Speed: 528-1064Mbps Operating Frequency: 66-133MHz