Although handhelds are getting more powerful chips, they still lag behind the hardware that can be found in desktop and laptop PCs. However, one modder has created their own handheld system based on high-end laptop hardware.
Billibilli creator Qingchen DIY (via Videocardz) has a built a portable device that has a huge 12.5-inch 4K IPS display panel. In their video, the custom handheld is shown to be running on Windows 11, while the system settings shows that it contains an Nvidia GeForce RTX 4090 laptop GPU as well as an Intel Core i9-149000HX CPU. It also contains 64GB of DDR5-5600 memory and 2TB of storage.
It appears that this was a laptop that has been converted into a gaming handheld, with a light green shell containing the usual thumbsticks and face buttons, as well as a number of ports and a cooling vent at the top.