Created by 'PotatoOfDoom', the "FidelityFX Super Resolution 2.0 for Cyberpunk" mod is still very early in development and still more of a proof of concept at this point, but going by early testing, the performance of Cyberpunk 2077 in 4K resolution using FSR 2.0 instead of DLSS improves significantly.
The modder notes that, in most cases, the standard DLSS version of Cyberpunk 2077 will work better than this mod.