There's already a mod to make Starfield compatible with Nvidia's DLSS on PC
, by Thibaut
A few weeks ago, Bethesda and AMD formalized their partnership for Starfield, and so is the PC version of the game fully compatible with FSR2 technology. Unfortunately, gamers with an Nvidia graphics card will not be able to enjoy the benefits of DLSS.
However, one user has already created a mod available at this address that allows Starfield to use DLSS or XeSS instead of FSR2.
Of course, the quality of upscaling will depend on the power of the PC.
Source: videogameschronicle.com