We tested the laptops using BioShock Infinite’s benchmarking mode and by playing half an hour of The Witcher 3 on ultra with VSync off. We measured the laptops’ internal temperature using HWMonitor and measured the surface temperature at various points on the keyboard and underside using an IR thermometer. We tested each laptop’s screen using some of the Lagom LCD monitor test pages, and used each for several workdays to get a feel for its keyboard, trackpad, screen, and speakers.
Because they usually require dual GPUs for the smoothest gameplay at native resolution, 4K gaming laptops are still the exception, and still expensive. And keep this in mind: Only the most powerful graphics cards can render complex game animations at playable frame rates across the full screen at 4K, so a 1080p screen may actually be a better use of your money if all you do is play games.