The 6900HX has an RDNA2 GPU with 12xCU, compared to the Deck's RDNA2 with 8xCU. The Steam Deck is also limited by the power usage, the TDP is hard capped at 15W, while the 6900HX gets 45W TDP.
My issue with using the Deck as the benchmark is that it is designed for 720p. Even connected to a 4K TV, the Steam Deck by default will force the game to run at 720p, and upscale it to 4K.
If you're okay with a bit bigger, AM5 APUs are rumored to be coming out soon with BIOS updates that added support recently. I expect those to have RDNA3 like the laptop 7840HS and other chips. It'll be the first GPU update to desktop APUs since the 5600G. I'm excited and might build a new mITX to replace my own HTPC
My issue with using the Deck as the benchmark is that it is designed for 720p. Even connected to a 4K TV, the Steam Deck by default will force the game to run at 720p, and upscale it to 4K.
If you're okay with a bit bigger, AM5 APUs are rumored to be coming out soon with BIOS updates that added support recently. I expect those to have RDNA3 like the laptop 7840HS and other chips. It'll be the first GPU update to desktop APUs since the 5600G. I'm excited and might build a new mITX to replace my own HTPC