Acer Aspire Z3100, 21.5", Full HD, AMD Athlon II X2, 3 GB, 640 GB, Windows 7 Home Premium Acer Aspire Z3100. Display diagonal: 21.5", HD type: Full HD, Display resolution: 1920 x 1080 pixels. Processor family: AMD Athlon II X2, Processor frequency: 2.8 GHz. Internal memory: 3 GB, Internal memory type: DDR3-SDRAM. Total storage capacity: 640 GB, Optical drive type: DVD-RW. Operating system installed: Windows 7 Home Premium. Product color: Silver