HP RAM Module 1 x 4 GB DDR3 SDRAM 1333MHz DDR3-1333/PC3-10600 Registered Internal Memory 604504-B21 at Amazon.com
Silicon Power Hynix IC Compatible for Apple DDR3 DDR3L 16GB (2 x 8GB) RAM 1600MHz (PC3 12800) 204 pin CL11 1.35V Non ECC Unbuffered SODIMM Laptop Notebook Memory RAM Module Upgrade at Amazon.com
SP004GLSTU133V02 Silicon Power 4GB SODIMM Laptop Memory