This is the best coverage of the new Deck that I've seen yet.
Upgraded:
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7.4" OLED HDR screen with a 90hz refresh rate and 600 nits brightness(with 1000 nits peak brightness), (old screen 7" LCD with 60hz refresh and 400 nits brightness). Touchscreen accuracy and responsiveness is reportedly improved.
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Longer battery life. Improvements to software and hardware are supposed to increase the battery life by 30-50%. New battery is 50wh vs original 40. Original decks will see some of this improvement thanks to software/bios updates, but not as much as the new Decks. The new Deck charges faster as well, charge from 20 to 80% battery in 45 min.
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6E wifi module for improved wifi speed.
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Dedicated bluetooth module, allowing better audio quality over bluetooth and the option to wake the steam deck from a bluetooth controller. Will also support more controllers at once for multiplayer.
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Faster RAM, 6400 MT/s vs 5500 MT/s on original.
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More repairable. The screws are now torx, and all thread into metal screw holes. Should prevent stripped screws that were the most common issues with SSD replacements.
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New carrying case, for the 1TB model, there's an insert case inside the full size case. The insert can be pulled out and used as a slim carrying case when you don't need full protection.
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Weighs 5% less.
Prices:
$649 - 1TB OLED
$529 - 512GB OLED
$399 - 256GB LCD
For a limited time, Valve will sell a special edition 1TB OLED with a translucent shell for $679, only in the US and Canada. Expected to sell out quickly.
Note: I'm updating this as I get more information, so the written out info will change as I learn more.