Crucial 16GB Kit (8GBx2) DDR3/DDR3L 1600 MT/s (PC3-12800) DR x8 ECC UDIMM 240-Pin Memory - CT2KIT102472BD160B at Amazon.com
Amazon.com: OWC 16GB (2 x 8GB) PC8500 DDR3 ECC-R 1066MHz DIMMs Memory Compatible with Mac Pro Early 2009 & Late 2010 'Nehalem' & 'Westmere' Systems and Early 2009 Xserve. (OWC85MP3S8M16GK) : Everything Else
Timetec Hynix IC 16GB Kit(2x8GB) DDR3L 1600MHz PC3-12800 Unbuffered ECC 1.35V CL11 2Rx8 Dual Rank 240 Pin UDIMM Server Memory Ram Module Upgrade ( 16GB Kit(2x8GB)) at Amazon.com
Samsung 16GB DDR3-1600 ECC Registered Server Memory M393B2G70QH0-CK0
16GB KIT (2 x 8GB) DIMM DDR3 ECC Registered PC3-12800 1600MHz Dual Rank RAM Memory. For Gateway GR Server Series GR180 F1 GR320 F1 GR360 F1 GR380 F1. at Amazon.com