Lenovo ThinkPad W540 20BG - Core i7 4700MQ / 2.4 GHz - Windows 7 Pro 64-bit / 8 Pro 64-bit downgrade - pre-installed: Windows 7 - 8 GB RAM - 500 GB HDD - DVD-Writer - 15.6" 1920 x 1080 ( Full HD ) - NVIDIA Quadro K1100M / Intel HD Graphics 4600 - 802.11ac

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