Valve's Steam Deck handheld automatically adjusts its minimum VRAM allocation in its native Linux-based OS, but you can manually set a value between 256MB to 4GB (of the 8GB available to its GPU) to help with gaming performance when using Windows 11 and even boost specific games in SteamOS. Here's how to increase the UMA Frame Buffer Size on your Steam Deck and experiment with games in each operating system.
