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A-Tech 4GB Module for ASUS X54C Laptop & Notebook Compatible DDR3/DDR3L PC3-12800 1600Mhz Memory Ram (ATMS393749B12034X1) at Amazon.com
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CMS 4GB (1X4GB) DDR3 10600 1333MHZ NON ECC SODIMM Memory Ram Upgrade Compatible with Asus/Asmobile® Notebook X54C-Bbk15, X54C-Bbk17 - A30 System Specific Memory - Newegg.com
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