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4GB 2X2GB Memory RAM for Lenovo ThinkPad X Series X61 (7674ES7) 200pin 667MHz PC2-5300 DDR2 SO-DIMM Black Diamond Memory Module Upgrade System Specific Memory - Newegg.com
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Arch Memory 2GB 200-Pin DDR2 667 MHz So-dimm RAM for Lenovo ThinkPad X61 Tablet 6364 Series at Amazon.com
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