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16GB 2 x 8GB DDR3 1600 Notebook Memory RAM Dell® Latitude E5540 Notebook - A7 - Newegg.com
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CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with Dell® Latitude E5540 Notebook - A7 at Amazon.com
4GB Black Diamond Memory Module for Dell Latitude E6230 DDR3 SO-DIMM 204pin PC3-12800 1600MHz Upgrade - Walmart.com