ThinkPad released in 2011. This version of the T420 is thicker then the T420s and lacks motherboard level USB 3.0 hardware. The T420i is very similar, but not quite the same.

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ram does not support

my question is

lenovo laptop t420 not support 4gb ram and not open laptop

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Thank you very much, for given answer to my question

yes, lenovo accept 16gb memory

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Chosen Solution

Your Lenovo will support 16GB of RAM. Her's how to install it:

ThinkPad T420 Memory Replacement

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