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Lenovo ThinkPad W540 15.5" Intel Core i7-4800MQ 2.7GHz / 8GB / 250GB vs Lenovo ThinkPad W550s 15.6" Intel Core i7-5500U 2.4GHz / 8GB / 500GB: What is the difference?
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Amazon.com: Lenovo Thinkpad W540 20BG0011US (i7-4700MQ Processor, 2.4GHz, 8GB, 500GB, DVDRW, Windows 7 Pro 64-bit Preinstalled through Windows 8 Pro) : Electronics
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