I ran some power consumption tests on #Windows 11, measuring from the wall.
My system: Ryzen 9 3900X, Radeon RX 6800 XT, 32GB RAM.
1% CPU utilization (Idle): 67W
5% CPU + 10% GPU (Streaming with Plex): 130W
Dirt 5 Benchmark (4K, High Preset, Uncapped FPS): 431W
Dirt 5 Benchmark (4K, High Preset, 60FPS Cap): 355W
Dirt 5 Benchmark (1440p, High Preset, 60FPS) Cap) : 288W
The power savings gained JUST from capping FPS to 60 is more than 2x the total power of a Steam Deck under heavy load.