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Dell Latitude e6420 14" Laptop- 2nd Gen 2.8 GHz Intel Core i7, 8GB-16GB RAM, Hard Drive or Solid State Drive, Win 10 PRO
8GB [2x4GB] DDR3-1333 RAM Memory Upgrade Kit for The Dell Latitude E6420 (Genuine A-Tech Brand) at Amazon.com
Dell Latitude E6420 RAM Replacement - iFixit Repair Guide