The slimmer version of the bulkier ThinkPad T420. The T420s is notable for its lower battery life and noisier fan compared to the original T420 laptop.

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How can I install more RAM?

My laptop is running a little sluggishly, and I want to upgrade the amount of memory. How would I go about doing this?

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If you would like to install more RAM, please note that 1333 MHz SO DIMM is the recommended memory for this system. There is an excellent installment guide here.

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You may need the most recent BIOS update but the T420s supports 16GB of RAM, not 8 as previously (and correctly at the time) published. You can use RAM that is faster than 1333 MHz, but it will not use a faster speed than 1333 MHz.

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