HP 7320 All-in-One, TouchSmart. Processor clock speed: 2.5 GHz, Processor family: Intel Core i5, Processor model: i5-2400S. Internal memory: 4 GB, Maximum internal memory: 8 GB, Internal memory type: DDR3-SDRAM. Total storage capacity: 500 GB, Storage media type: HDD, Storage drive interface: Serial ATA. Optical drive type: DVD Super Multi. Display diagonal: 546.1 mm (21.5 "), Display resolution: 1920 x 1080 pixels, Display brightness: 250 cd/m²