And workstations generally have stronger CPUs as well, like an Intel Core i9 or Intel Xeon processor, instead of the typical Core i7 you'd find in most gaming laptops. The key difference between some of the best gaming laptops around and a workstation is its GPU, as it's primarily optimized for tasks such as design and 3D rendering instead of sheer gaming performance.
Of course, the best workstation laptops are targeted toward professional users who need to run graphics-intensive apps.