Ram memory 4GB (1 x 4GB) DDR3 PC3-12800,1600MHz, 204 PIN SODIMM for laptops at Amazon.com
PC3-10600 DDR3 1333 8GB Kit (2x4GB) RAM PC3 10600S 1333MHZ 2Rx8 204-pin 1.5v 4GB Memory Upgrade for Laptop at Amazon.com
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Micron 4GB DDR3 RAM PC3-10600 204-Pin Laptop SODIMM 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
Samsung DDR3-1333 4GB/512Mx64 Original Memory at Amazon.com
Crucial 4GB Single DDR3 1333 MT/s (PC3-10600) CL9 Unbuffered UDIMM 240-Pin Desktop Memory Module CT51264BA1339 at Amazon.com