The Lenovo ThinkPad T420 is pack a 14-inch display and up to 1600×900 resolution, while the ThinkPad T520 have 15.6-inch display, up to full HD 1920×1080 resolution and up to the Intel i7-2820QM 2.3GHz quad-core processor.
The Lenovo ThinkPad T420 and T520 have 16:9 display ratio, Nvidia Optimus switchable graphics technology, and Windows 7 OS.
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