iMac: Get a refurbished 2012 21.5" Core i5 iMac with 8GB RAM. Operating system: Mac OS Cataline operating system (released in 2019). Display: With a 21.5" 1920 x 1080 LED-backlit 16:9 widescreen IPS display. Hard drive: Choose 500GB HDD, 1TB HDD or 256GB SSD of internal storage. Processor: Features a NVIDIA GeForce GT 640M graphics processor with 512 MB of dedicated GDDR5 memory. Connectivity: Four USB 3.0 ports, dual Thunderbolt ports, Gigabit Ethernet, 802.11n, and Bluetooth 4.0. Features: Plus a FaceTime HD webcam and stereo speakers. 2012 21.5 Core I5 iMac Computer | 8GB | Living Social