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4GB Upgrade for a Lenovo ThinkPad T420 System (DDR3 PC3-12800, NON-ECC, ), 204-pin SODIMM By Crucial - Walmart.com
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Lenovo Thinkpad T420 upgrade - RAM Memory replacement and HDD to SSD nd replace CD DVD drive - video Dailymotion
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A-Tech 4GB Module for Lenovo ThinkPad T420 Laptop & Notebook Compatible DDR3/DDR3L PC3-12800 1600Mhz Memory Ram (ATMS350677B12034X1) at Amazon.com
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Memory RAM | 4GB - Lenovo ThinkPad T420 T-Series - (OEM-# 55Y3711, 55Y3717, 78Y7385) - 1333MHz, Unbuffered, 1,5V
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