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DIY 12.5-Inch Handheld Packs RTX 4090 and Core i9 to Run 4K AAA Games

A one-off build that runs AAA games at native 4K on a 12.5-inch chassis reveals trade-offs in ergonomics, thermals, battery capacity.

Forget the Steam Deck, this gaming handheld has an Nvidia GeForce RTX 4090 in it
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DIY handheld packing an RTX 4090 Laptop GPU
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Overview

  • The prototype integrates an Intel Core i9-14900HX CPU, NVIDIA RTX 4090 Laptop GPU, 64 GB DDR5 RAM and up to 4 TB SSD storage into a Sharp 12.5-inch 4K 60 Hz display chassis.
  • Demonstration footage on Bilibili and YouTube’s NITTRX channel shows Cyberpunk 2077 running at 60–70 FPS and God of War at 110–120 FPS with CPU/GPU temperatures held between 66 °C and 72 °C.
  • The mobile RTX 4090 GPU reportedly draws nearly 175 W under load while maintaining playable temperatures in the compact form factor.
  • The device’s 50 Wh battery supports about 30 minutes of idle use but cannot sustain gaming away from an external power source.
  • Observers say the build proves native 4K handheld gaming is technically possible but highlights size, cooling design and cost hurdles that stand in the way of a commercial product.