16GB 1333 MHz DDR3 Memory for 2011 MacBook Pro and iMac
Certified for Kingston Replacement DDR3 DIMM Memory RAM
upgrade - Can I use 16GB DDR3-1600MHz RAM in an early Macbook Pro 8.2? - Ask Different
Amazon.com: Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac(Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) MAC RAM Upgrade :
OWC 16GB (2x8GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Ram Upgrade Compatible with 2011-2015 iMac, 2011-12 Mac Mini, and 2011-2012 MacBook Pro (Non-Retina Display) Models (OWC1600DDR3S16P) at Amazon.com