DUOMEIQI PC3 4GB 10600U DDR3 1333 RAM1 4GB PC3 10600 DIMM Memory DDR3-1333 PC3-10600U 1333mhz UDIMM 2RX8 CL9 1.5v 240 PIN Non-ECC Unbuffered for Intel AMD System for Desktop at Amazon.com
OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com
Corsair CMSA4GX3M1A1066C7 Apple Certified 4GB (1x4GB) DDR3 1066 MHz (PC3 8500) Laptop Memory 1.5V at Amazon.com