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
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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