A modder has created a custom 12.5-inch handheld gaming device capable of running games at 4K resolution and 100 frames per second. This surpasses the performance of devices like the Steam Deck. The device's specifications and cooling system are not detailed, but the claim of 4K 100FPS performance suggests significant processing power and thermal management solutions. This project highlights the potential for enthusiast-built handheld gaming PCs to deliver high-end gaming experiences on the go.