Sun 704-1272 32GB (2x16GB) DDR3 Registered ECC PC3-10600 1333Mhz Memory
CMS 32GB (2X16GB) DDR3 12800 1600MHz ECC Registered DIMM Memory Ram Upgrade Compatible with IBM® System X3500 M4 (E5-2600 V2) 7383-Xxx for Server Only - B17 at Amazon.com
A-Tech 32GB (2x16GB) RAM for Dell PowerEdge C6105, C6145, C6220, C6220 II, C8220, C8220X Servers | DDR3 1600MHz ECC-RDIMM PC3-12800 2Rx4 1.5V 240-Pin ECC Registered DIMM Server Memory Upgrade Kit at Amazon.com