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A-Tech 8GB Module for ASUS X540LA Laptop & Notebook Compatible DDR3/DDR3L PC3-12800 1600Mhz Memory Ram (ATMS393746B12351X1) at Amazon.com
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Asus X540L 15.6 inch GOLD Laptop - i3-5005U 2.00GHz CPU, 4GB RAM, 1TB HDD
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Asus 15.6" X540LA-SI30205P Laptop Intel Core i3 4GB Memory 1TB Hard Drive Silver - Walmart.com