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

Supported Model Configurations Upgrade Designed For Apple iMac (21.5-inch, Mid 2011) Apple Order No. BTO/CTO | 2.8GHz 4-Core Intel Core i7-2600S MC309LL/A | 2.5GHz 4-Core Intel Core i5-2400S MC812LL/A | 2.7GHz 4-Core Intel Core i5-2500S Apple Model No. A1311 (EMC 2428) Apple Model ID iMac12,1 Max Possible Memory 32GB 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