ThinkPad released in 2011. This version of the T420 is thicker then the T420s and lacks integrated USB 3.0. The T420i is worked on the same way and uses many of the same parts, so repair is more or less similar.

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

ThinkPad T420 Memory Replacement

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eswar will be eternally grateful.
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