HP CB423A. Internal memory: 0.25 GB, Internal memory type: DDR2, Memory form factor: 144-pin SO-DIMM. Dimensions (WxDxH): 66.6 x 3.81 x 28.5 mm, Package weight: 50.8g. Package dimensions (WxDxH): 177.8 x 133.4 x 25.4 mm, Size: 6.67 cm (2.625")