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1.1 Set UMA Buffer Size
Please use the new HTML-based guide https://baldsealion.github.io/Steam-Deck-Ultimate-Windows-Guide/
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This is necessary for some games to even run in Windows(ex. Guardians of the Galaxy), but in testing has also decreased stutter and increased overall in-game performance.
Changing this assigns the minimum amount of RAM allocated for the GPU. The maximum is 4GB which is recommended.
This can always be changed back. In rare circumstances, this can have a negative impact for performance on games(for games that specifically demand more RAM than VRAM). In this instance you can change it back to the default value of 1G
- With the deck shut down, Hold "volume +" and press the power button
Here is where you will change your core HW settings.
On the menu that appears choose "Setup Utility"
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Advanced > UMA Frame buffer size
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select 4G
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press the [two squares?] button next to the dpad to exit and save changes.
Proceed to the next wiki Page 1.2 Windows OS Tweaks