DLSS 5 does not simply use an AI upscaler that makes an attempt to generate a higher-resolution picture from a lower-resolution supply picture, resembling going from Full HD to 4K. It additionally provides AI-powered rendering on high of that. DLSS 5 NR makes an attempt to generate or alter sure visible properties of a picture utilizing neural strategies, together with lighting and materials results, probably changing a number of the work historically dealt with by typical rendering.
For the mod builders, the essential issue is the order during which the AI strategies are utilized. With commonplace DLSS 5, Nvidia first upscales the picture after which runs Neural Rendering on the end result. As a result of the rendering is utilized to the upscaled picture, considerably extra knowledge must be processed, placing a considerable load on the GPU and inflicting the body charge to drop significantly.
The builders of the OptiScaler fork mod have now merely reversed the order: The Neural Rendering course of is utilized to the unscaled, lower-resolution picture, which considerably reduces the computational workload. Solely afterward is the picture upscaled utilizing DLSS Tremendous Decision.