When you want no-compromise performance for CPU- and graphics-intensive tasks like 3D modeling, 4K video editing or running engineering software, you need a mobile workstation. With its optional Intel Xeon CPU and Nvidia Quadro graphics, Lenovo's 15.6-inch ThinkPad P50 is powerful enough to run cycle-sucking programs with ease but portable enough to take on the road. While other 15-inch workstations offer similar performance at lighter weights, this ,322 laptop (,515 as tested) stands out for its bes