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Valve releases the Steam Deck OLED with up to 1TB storage
(store.steampowered.com)
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Biggest improvement is probably the 30-50% increase in battery life. The deck already gets much better battery life than the ROG Ally or Lenovo Go (especially on low demanding games, it can get 2-4x the battery life), so this will further cement it as the best handheld PC for actually playing without the device plugged in.
I mean running the same game at the same settings/resolution/etc the Deck will get significantly better battery life. You can offset this somewhat by using task manager to close background processes in windows, but it still takes a lot more power to run stuff on the ROG Ally than the deck.
An example from Ally reviews was Stardew valley ran at 6-8w on the deck, but was pulling 16-20w on the Ally with same settings. Using task manager to close windows processes for the Ally down to the 12-15w range, but that's still a huge jump. This isn't even taking into consideration that you can tweak deck performance settings to run Stardew valley at a much lower power setting, I've seen people go as low as 3.8w giving them 10+ hours of battery life.