16GB KIT (4 x 4GB) for Intel W Series WX58BP (ECC Unbuffered). DIMM DDR3 ECC Unbuffered PC3-10600E 1333MHz Dual Rank Server Ram Memory. Genuine A-Tech Brand. at Amazon.com
Buffered VS Unbuffered RAM – What's the Difference, Really? – Internet Geeks
DDR3 ECC Unbuffered RAM LOT 8 GB 1600 MHZ PC3-12800E 1.5V UDIMM for workstation | eBay
ECC Unbuffered RAM UDIMM for Workstation DDR3 8 GB 1600 MHZ PC3-12800E 1.5V LOT | eBay