4 Pack (16GB) NANYA NT4GC72B4PB0NL-CG 4GB SERVER DIMM DDR3 PC10600(133 – Buffalo Computer Parts
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