Apple iMac (21.5-inch, Late 2011) Memory RAM | 4GB DDR3 1333MHz (PC3-10600) SODIMM 1.5V

Supported Model Configurations Upgrade Designed For Apple iMac (21.5-inch, Late 2011) Apple Order No. MC978LL/A | 3.1GHz 2-Core Intel Core i3-2100 Apple Model No. A1311 (EMC 2428) Apple Model ID iMac12,1 Max Possible Memory 16GB Product Information Total Capacity 4GB Class DDR3 Capacity Per Module 4GB Speed PC3-10600 Number of Modules 1 Frequency 1333MHz ECC Type Non-ECC Unbuffered Form Factor SODIMM Rank 2Rx8 (Dual Rank) Pin Count 204 Compatible Machine Type Laptop / Notebook / AIO Voltage 1.5V