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Refurbished: ASUS Laptop X53 Series Intel Core i3 2nd Gen 2310M (2.10GHz) 4GB Memory 320GB HDD Intel HD Graphics 15.6" Windows 7 Home Premium X53E-RH31 - Newegg.com
OFFTEK 4GB Replacement Memory RAM Upgrade for Asus X53E-SX948V (DDR3-10600) Laptop Memory at Amazon.com
4GB DDR3 Laptop Memory for Asus S56CA X53U X54H X54C X53E Notebook PCs | eBay