Lenovo ThinkPad W541 20EG - 15.6" - Core i7 4910MQ - Win 7 Pro 64-bit / Win 8.1 Pro 64-bit downgrade - pre-installed:

ThinkPad engineers have used their decades of experience and know-how to build the most powerful notebook Lenovo has ever produced; the W541. A brilliant Full HD display offers ultra-crisp images with rich vibrant colors; top processors and stunning NVIDIA graphics come together in a chassis constructed of highly durable yet lightweight materials such as magnesium alloy. A Thunderbolt 2.0 port provides the fastest possible connection to peripheral devices to lower the time spent moving large files.