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Dell T420 Memory Upgrades– Cloud Ninjas
Thinkpad t420 memory specs
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
Amazon.com: Lenovo Thinkpad T420 - Intel Core i5 2520M 8GB 320GB Windows 10 Professional (Renewed) : Electronics
HD] Installing RAM on a Lenovo Thinkpad T420 Guide T410 T400 - YouTube