Amazon.com: OWC 48GB (3 x 16GB) PC10600 DDR3 ECC-R 1333MHz DIMMs Memory Compatible with Mac Pro Early 2009 & Late 2010 'Nehalem' & 'Westmere' Systems and Early 2009 Xserve. : Everything Else
N8102-341 NEC Memory Server
DIMM DDR3 ECC Registered PC3-12800 1600MHz Dual Rank RAM Memory 16GB KIT (2 x 8GB) For HP-Compaq ProLiant Series at Amazon.com
Ramjet 16GB DDR3-1066 ECC DIMM PC3-8500 DDR3 1066Mhz Kit for Apple Mac Pro (2X 8GB) at Amazon.com
IBM 16GB ECC 4RX4 VLP DDR3 RDIMM PC3L-8500 1066MHz 1.35V CL7 Memory Module (90Y3221) at Amazon.com