Starfield's missing Nvidia DLSS support has been added by a free mod
Briefly

Starfield mods now support Nvidia's DLSS technology alongside AMD's FSR2 upscaling.
Full access to DLSS mod requires Patreon subscription or using cracks to bypass DRM.
The DLSS mod on NexusMods only supports DLSS2, while a Patreon version supports DLSS3 on compatible Nvidia cards.
Read at Ars Technica
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