iMac Intel 21.5" EMC 2428 (Mid 2011)
Intel i5-2400S Desktop CPU
Replace the i5-2400S 2.5 GHz central processing unit module in a Model A1311 Mid 2011 21.5" iMac. Physically compatible with a desktop computer motherboard with a LGA1155...
In May 2011, Apple upgraded the 21.5" iMac. Externally, the machine features edge-to-edge glass and an aluminum rear bezel. Internally, an LED display, 4 RAM slots (to upgrade to a maximum of 16 GB RAM), more powerful video processing, and featuring quad Core i5 and i7 processors.