OWC 12 GB Kit (3x4G) DDR3-1333 ECC Unbuffered DDR3 DIMM 3×4 Kit

Macintosh 12 GB Kit (3x4G) DDR3-1333 ECC Unbuffered DDR3 DIMM 3×4 Kit Dual Processor 2.66GHz and 2.93GHz systems Only
DDR3-1333, 8 memory sockets
use 3 modules for triple channel performance
NOTE: Maximum under OSX 10.6-10.8 is 96 GB,and 10.9 and above supports 128GB. 16GB ECC Registered modules require that all installed modules be of this same matching part. Other modules are not supported for use with this kit and need to be removed when this kit is added.