SteamOS on ROG Xbox Ally X offers no battery advantage over Windows

ETA Prime's tests show SteamOS running Forza Horizon 6 and Red Dead Redemption 2 above 50 fps at 1080p and 28W TDP on the Asus ROG Xbox Ally X. Battery life tracks power draw rather than the OS: about three hours in AAA games at 17W and up to eight hours in indie titles at 6–8W.

• Forza Horizon 6 and RDR2 clear 50 fps at 1080p and 28W TDP
• The Witcher 3 Remastered needs 30W for 60+ fps at 1080p
• AAA gaming lasts about three hours at 17W
• SteamOS drops Xbox Game Pass, ROG utilities and Windows-only titles