iMac Intel 21.5" EMC 2428 (Mid 2011) Consumables
Arctic Silver Thermal Paste
Forms a continuous, heat conductive layer between a processor and its heat sink. A new layer of thermal paste keeps your processor from overheating. 3.5 grams
Arctic Silver ArctiClean
Two part cleaner dissolves old thermal paste on heat sinks and processors. One 30 ml bottle of thermal material remover and one 30 ml bottle of thermal surface purifier.
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.