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I have a Lenovo Thinkpad T420 Core i5 2520M. What is the maximum memory I can have - 8 GB or 16 GB? - Quora
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128GB mSATA 6Gb/s Internal SSD Compatible with Lenovo ThinkPad T420 Series C29 - Computer Memory Solutions
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Amazon.com: Lenovo Thinkpad T420 14.1" HD Display Laptop, Intel Core i5, 4GB DDR3, 320GB HDD, DVD, Win7 Pro
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