https://wccftech.com/steam-deck-specifications-revealed-features-amd-van-gogh-apu-with-zen-2-cpu-rdna-2-gpu-cores/

Specifications of the Steam Deck Portable console have officially been listed and it looks to be the first AMD Van Gogh APU-powered device. Steam Deck is powered by the Steam OS 3.0 & will allow gamers to access the full Steam gaming experience in a handheld form factor.

Based on the official specifications sheet, the AMD Van Gogh APU powering Steam Deck is a very entry-level chip that packs more performance than the original Sony PlayStation 4. The AMD Van Gogh APU features the Zen 2 CPU and RDNA 2 GPU architecture. It is stated to run all AAA games very well since the resolution of the console would be limited to 1280x800 (16:10 aspect ratio) & there would be optimizations based around the SteamOS which would allow even better graphics performance.