Timetec Hynix IC Apple 4GB DDR3 1333MHz PC3-10600 SODIMM Memory upgrade For MacBook Pro 13/15/17 inch Early/Late 2011,iMac 21.5-inch Mid/Late 2011,27-inch Mid 2011,Mac mini 5,1 & 5,2 Mid 2011 (High Density 4GB) DDR3 &#x2022; 1333MHz &#x2022; PC3-10600 &#x2022; 204-Pin &#x2022; Unbuffered &#x2022; Non ECC &#x2022; 1.5V &#x2022; CL9 &#x2022; Single Rank &#x2022; 1Rx8 based &#x2022; 512x8JEDEC standard 1.5V (1.425V ~1.575V) Power SupplyModule Size: 4GB &#x2022; Package: 1x4GB &#x2022; For MacBook Pro 8,1 (13-inch Early/Late 2011)/MacBook Pro 8,2 (15-inch Early/Late 2011)/MacBook Pro 8,3 (17-inch Early/Late 2011)For iMac 12,1 (21.5-inch Mid/Late 2011)/iMac 12,2 (27-inch Mid 2011) &#x2022; Mac mini 5,1 & Mac mini 5,2 (Mid 2011)/Mac mini 5,3 (Mid 2011 Server)