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SK Hynix 4GB HMT451S6AFR8A-PB DDR3 1Rx8 PC3L-12800S Laptop Memory at Amazon .com
Samsung Laptop Memory 4GB 1Rx8PC3L-12800S-11-13-B4 M471B5173QH0-YK0 at Amazon.com
Samsung original 4GB, 204-pin SODIMM, DDR3 PC3L-12800, ram memory module for laptop ( M471B5173QH0-YK0 ) at Amazon.com
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