Patriot Memory 4GB PC3-12800. Internal memory: 4096 MB, Internal memory type: DDR3, Memory clock speed: 1600 MHz. Memory voltage: 1.5 V. Width: 134 mm, Depth: 6.4 mm, Height: 29 mm. Package weight: 25.5 g, Package dimensions (WxDxH): 16 x 53 x 165 mm. Certification: RoHS