Apple 21.5", iMac. Processor clock speed: 2.7 GHz, Processor family: Intel Core i5, Processor model: i5-2500S. Internal memory: 4 GB, Maximum internal memory: 16 GB, Internal memory type: DDR3-SDRAM. Total storage capacity: 1000 GB, Hard drive rotational speed: 7200 RPM. Optical drive type: DVD Super Multi DL. Compatible memory cards: SDXC