Contrary to certain assumptions, the game does not support upscaling techniques such as Nvidia DLSS or Intel XeSS. Instead, it has been confirmed that Starfield is optimized for AMD's FidelityFX Super Resolution (FSR) 2.0.
Further clarification is provided by Sebastian Castellanos, a Twitter user. He confirms that Starfield lacks DLSS or XeSS support at the moment. Nevertheless, Castellanos mentions that the integration of Nvidia and Intel upscaling technologies could be a feasible task for Bethesda. It's pertinent to mention that even without DLSS or XeSS support in Starfield, users with Nvidia GeForce graphics cards can still utilize AMD's FSR since it's compatible with Nvidia GPUs. Conversely, DLSS is strictly limited to newer Nvidia GeForce graphics cards and isn't available for AMD Radeon GPUs.
For individuals who have advanced access to Starfield, the game files have been available on the Microsoft Store since August 17, and starting from August 30, these files can be downloaded via Steam. Starfield's official launch date is slated for September 6, targeting both PC and Xbox Series console enthusiasts.