Topic on Talk:Atomic Heart
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Frame Generation is not tracked for DLSS, the Super Resolution (aka upscaling) is - as it's the main target of using DLSS.
NVIDIA calls it "DLSS 3" as it's the easiest to market.
As for the technicalities, DLSS 3.0 never existed, but 3.1 does, as shown here: https://github.com/NVIDIA/DLSS/releases/tag/v3.1.0