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Freedom251 › Blog › AMD FSR

How Upscaling Works—and Where DLSS Still Edges Out FSR

By Freedom251 Team · · 5 min read

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Upscaling lets a game render fewer pixels, then reconstruct an image for your display. DLSS and AMD FSR both do this, but neither name refers to one fixed algorithm or feature. DLSS’s clearest edge is the breadth of its current feature suite; the evidence available does not establish that DLSS always produces a better-looking or faster upscaled image than FSR. The result depends on the game, GPU, output resolution, mode, implementation and version.

What upscaling does

A game normally renders a scene at an internal resolution and sends the resulting image to the display. With upscaling, it renders fewer pixels than the display’s output resolution and reconstructs a larger image from that lower-resolution input. The result is not the same as rendering every output pixel natively: the upscaler must infer detail that was not directly rendered at the target resolution.

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Temporal upscalers use information across frames to make that reconstruction. Alongside the current image, they can use motion data and information carried forward from earlier frames. NVIDIA describes DLSS Super Resolution as using lower-resolution images, motion data and feedback from prior frames. AMD documents temporal FSR generations as well as its newer machine-learning upscaler. These inputs help reconstruct detail and keep it stable as objects or the camera move, but can also produce artifacts when the available information is incomplete or changes quickly.

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Upscaling is most useful when rendering at the display’s full resolution is too demanding or when the player wants to trade some image fidelity for more rendering performance. A quality mode typically starts from a higher internal resolution than a performance-oriented mode, but the exact modes and behavior are set by the game’s implementation. The mode name alone does not guarantee the same result across different games or technologies.

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DLSS and FSR are feature families, not single upscalers

What DLSS does

NVIDIA’s DLSS suite separates several functions. Super Resolution reconstructs a higher-resolution image from a lower-resolution render. Frame Generation creates additional frames, and Multi Frame Generation is a distinct feature associated in NVIDIA’s current materials with RTX 50-series hardware. Ray Reconstruction replaces or improves denoising in ray-traced scenes. DLAA applies AI anti-aliasing while rendering at native resolution rather than upscaling from a lower one.

NVIDIA’s current DLSS 4.5 materials describe Dynamic Multi Frame Generation and a second-generation transformer model for Super Resolution and Ray Reconstruction. These are vendor descriptions of the product’s capabilities, not independent proof that its output is superior in every game.

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What FSR does

AMD’s FSR versions have changed over time. Earlier generations used analytical or temporal approaches; AMD’s current materials describe machine-learning-based FSR Upscaling 4, while also documenting compatibility paths for older Radeon architectures. FSR is not a synonym for one method, and support for one FSR feature does not guarantee support for every other feature in the family.

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Version details change: AMD GPUOpen’s SDK 2.3, listed in June 2026, includes FSR Upscaling 4.1.1 and FSR Frame Generation 4.0.1. That is a version listing for the SDK, not a promise that a particular game or GPU exposes those versions.

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Why DLSS can be said to edge out FSR—and what that does not mean

DLSS has an edge in the breadth of the feature set described here: the suite includes upscaling, native-resolution AI anti-aliasing, ray-tracing denoising and generated-frame options. That is a feature-breadth comparison, not a finding that DLSS wins every image-quality or performance comparison. The technologies do not map one-to-one: comparing DLSS Super Resolution with FSR Upscaling is different from comparing their frame-generation options or ray-tracing features.

For image quality, Digital Foundry published an independent comparison of FSR 4 against DLSS 3/4 on March 5, 2025. It is a useful reference for the versions, hardware, games and conditions tested at that time, but it does not settle the outcome for every title or for later 2026 revisions. The available comparison details do not support a universal ranking or a claim that one implementation consistently wins across all relevant dimensions. NVIDIA’s and AMD’s own quality and performance statements should be read as vendor claims; AMD’s published figures, where used, are based on AMD’s stated test systems, drivers, games and modes rather than a cross-vendor independent test.

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A fair comparison needs to hold the important variables constant:

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  • Game and scene: Different engines and implementations can produce different results, even with the same upscaler.
  • GPU and version: Compare the actual hardware and software versions supported by the game, not just the DLSS or FSR label.
  • Output resolution and mode: A quality mode at one output resolution is not equivalent to a performance mode at another.
  • Image behavior in motion: Inspect fine detail, temporal stability, ghosting and other artifacts as the camera and objects move.
  • Performance and responsiveness: Measure rendering performance separately from generated-frame rate and input latency.

Those distinctions matter especially with frame generation. Creating additional displayed frames is not the same operation as reconstructing each rendered image at a higher resolution. A larger displayed frame-rate number does not, by itself, show that the upscaled image is better or that controls feel as responsive as they do at the same rate of traditionally rendered frames.

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Check support for the exact game and feature

DLSS requires compatible RTX hardware, and availability varies by GPU generation and feature. Multi Frame Generation, for example, is associated with RTX 50-series hardware in NVIDIA’s current materials; that does not mean every DLSS feature requires an RTX 50-series card. FSR support likewise depends on the game, the FSR version and the supported product. Do not infer feature availability from the family name alone.

  1. Find the game’s feature list or graphics settings. Confirm whether the title offers the particular feature—such as Super Resolution, Frame Generation or Ray Reconstruction—and which version or mode it exposes.
  2. Check the GPU requirement for that feature. Consult NVIDIA’s or AMD’s compatibility information, then verify that it applies to your GPU generation and the game’s implementation.
  3. Compare the same output and mode. If both options are available, use the same resolution and comparable quality settings, and assess moving scenes as well as still images.
  4. Treat frame generation as a separate choice. Evaluate image reconstruction, generated-frame behavior and responsiveness independently rather than judging them by one frame-rate figure.

For developer and version context, NVIDIA’s DLSS overview and developer documentation describe its features and support; AMD’s FSR product and GPUOpen documentation describe its feature generations and compatibility. Consult the game’s own documentation as well, since a vendor’s general feature page cannot confirm what a specific title implements.

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