CMS 16GB (2X8GB) DDR3 12800 1600MHz ECC Non Registered DIMM Memory Ram Upgrade Compatible with Lenovo® Thinkstation E31 EccU for Server Only - B89 at Amazon.com
Lenovo ThinkStation E31 3695RNU Workstation, 1 x Intel Core i3 Dual-core (2 Core) i3-3220 3rd Gen 3.30 GHz, 4 GB DDR3 SDRAM RAM, 500 GB HDD, Small Form Factor, Raven Black - Walmart.com
OFFTEK 8GB Replacement Memory RAM Upgrade for IBM-Lenovo ThinkStation E31 (Small Form Factor) (DDR3-12800 - Non-ECC) Server Memory/Workstation Memory at Amazon.com
4GB Memory Upgrade for Lenovo ThinkStation E31 DDR3 P3-12800 1600MHz Non-ECC Desktop DIMM RAM Upgrade (PARTS-QUICK Brand) at Amazon.com
Lenovo E31 Thinkstation SFF CAD and Engineering Review
Lenovo ThinkStation E31 3.4Ghz Xeon E3 8GB RAM 500GB HDD Windows 10 Pro | eBay