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Lenovo ThinkPad T420/T420i - iFixit
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2GB Kit (2x1GB) Memory RAM Upgrade for Lenovo ThinkPad R40 Laptops | eBay
ThinkPad T420, T410, T400 - RAM Installation Guide/Memory Upgrade - YouTube
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CMS 16GB (2X8GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad T420 4177, 4178, 4180, 4236 Series - A13 at Amazon.com
I have a Lenovo Thinkpad T420 Core i5 2520M. What is the maximum memory I can have - 8 GB or 16 GB? - Quora
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Upgrading Ram from 4Gb to 6Gb on Lenovo Thinkpad T420 - YouTube
