32GB (4x8GB) Mac Pro 4,1 5,1 UPGRADE KIT PC3L-10600 1333MHz DDR3 ECC Memory
46W0678 IBM 32GB DDR3 LR Server Memory
OWC 32GB (2 x 16GB) PC10600 DDR3 ECC-R 1333MHz DIMMs Memory Compatible with Mac Pro Early 2009 & Late 2010 'Nehalem' & 'Westmere' Systems and Early 2009 Xserve. (OWC85MP3S9M032K) at Amazon.com