# FSR 4 INT8: reconstructed GPU passes and comparison harness

> An FSR 4.1.1 INT8 investigation reconstructs the upscaler’s GPU passes in HLSL and compares their outputs with AMD’s compiled kernels through a D3D12 harness. The author reports byte-identical offline results for the documented passes and supplies an FFX-compatible provider build that obtains network weights from a user-supplied official DLL. Colour-mode paths and live frames have narrower comparison evidence.

- Type: Case study
- Targets: Binary
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/int3rrobang/fsr4-int8-reverse-engineering>
- Primary source: <https://github.com/int3rrobang/fsr4-int8-reverse-engineering/blob/739e667454ffaba78a985412443d5df73602f7e2/README.md>
- Catalog page: <https://awesomerea.org/resources/fsr4-int8-reconstruction-case/>
- Record JSON: <https://awesomerea.org/resources/fsr4-int8-reconstruction-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/fsr4-int8-reconstruction-case/index.md)

## Requirements & limits

- **Prerequisites:** Windows 10/11, Visual Studio with MSVC v143+, CMake and dxc are required for the documented build.
- **Prerequisites:** The provider build requires a user-supplied official FSR 4.1.1 DLL and FidelityFX-SDK checkout.
- **Testing evidence:** The author reports byte-exact offline kernel comparisons; live output is not compared frame by frame.
- **License:** MIT license.

## Primary sources

1. <https://github.com/int3rrobang/fsr4-int8-reverse-engineering/blob/739e667454ffaba78a985412443d5df73602f7e2/README.md>
2. <https://github.com/int3rrobang/fsr4-int8-reverse-engineering/blob/739e667454ffaba78a985412443d5df73602f7e2/docs/README.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.