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How to Replace or Upgrade RAM Lenovo T420 - YouTube
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Memory RAM | 8GB - Lenovo ThinkPad T420s T-Series - (OEM-# 03X6401) - 1333MHz, Unbuffered, 1,5V
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Lenovo ThinkPad T420s RAM Replacement - iFixit Repair Guide
Memory RAM | 8GB - Lenovo ThinkPad T420s T-Series - (OEM-# 03X6401) - 1333MHz, Unbuffered, 1,5V
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CMS 16GB (2X8GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad T420S 4170, 4171, 4173, 4174 - A13 at Amazon.com
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Lenovo ThinkPad T420S - 14" - Core i5 2520M - 8 GB RAM - 128 GB SSD
4GB RAM Memory Upgrade for the Lenovo ThinkPad T420 | eBay
