v-Color DDR3 32GB (2 x 16GB) Hynix IC 1866MHz (PC3-14900) for Mac Pro 2013 ECC RDIMM 1.5V CL13 2Rx4 Registered DIMM Dual Rank Server Memory Ram Module Upgrade (TR316G18D413K) at Amazon.com
Dell R410 DDR3 ECC Server RAM: Up to 1866MHz 8GB Memory 64GB - 192GB Lot | eBay