ThinkPad released in 2011. This version of the T420 is thicker then the T420s and lacks motherboard level USB 3.0 (The system requires an EC/34 USB 3.0 card to use it). 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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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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