Ramjet 48GB DDR3-1333 ECC DIMM PC3-10600 DDR3 1333Mhz Kit for Apple Mac Pro (6x 8GB) Mac Pro Memory for Models 5,1 (6 Core and 12 Core) Six 8GB DDR3-1333MHz FB-DIMMS for Mac Pro Westmere Mid 2010 These FB-DIMMS take advantage of Tri-channel Technology