Corsair Vengeance 4GB (2 x 2GB) Dual Channel CMZ4GX3M2A1600C9
Vengeance® Low Profile — 4GB DDR3 Memory Kit
OWC 8 GB (2 X 4GB) ram PC8500 DDR3 1066MHz sodimm 204-pin Memory Upgrade Kit, (OWC8566DDR3S8GP), Compatible with MacBook Pro, MacBook, Mac Mini and iMac at Amazon.com