GoKawiilModders cut FSR 4 upscaling time in half on AMD's repurposed PS5 mining chip
A community developer has reworked AMD's FSR 4 upscaler to run far more efficiently on the BC-250, a leftover PS5-derived crypto-mining board now being turned into a Linux gaming device. Testing showed 1440p processing time drop from 11.51ms to 5.92ms, with similar roughly 50% gains at 1080p and 4K, while producing output identical to the original shaders. The gains build on earlier Mesa driver work and now shift the optimization into a portable FidelityFX DLL.
GoKawiil's interpretation of the reporting above, not reported fact.
FSR 4 is designed around machine-learning and low-precision integer hardware found in newer AMD GPUs, so getting it to run well on older RDNA 2 silicon like the BC-250 required rewriting core math operations rather than just tweaking settings. Packaging the fix as a portable DLL rather than a driver-specific patch means the optimization could more easily spread to other RDNA 2 hardware and projects beyond this niche mining-board revival.
- FSR 4 processing time on the BC-250 fell by nearly half across 1080p, 1440p and 4K resolutions.
- The optimization replaces expensive fallback math with efficient 24-bit integer operations, cutting one shader from 64,269 to 37,613 instructions.
- Moving the fix into a portable FidelityFX DLL could let other RDNA 2 hardware benefit beyond this specific mining-board project.
AMD Radeon RX 6800 — The AMD Radeon RX 6800 is a powerful graphics card that pairs perfectly with the latest FSR 4 optimizations, offering gamers a significant boost in performance at 1440p and 4K resolutions. With modders improving FSR 4 processing times on AMD’s RDNA 2 hardware, upgrading to an RX 6800 ensures you get the most out of these enhancements for smooth, high-quality gaming experiences.
See AMD Radeon RX 6800 on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: tomshardware.com — Etiido Uko, 2026-09-14
Published there as: “Modders halve FSR 4 render times on AMD’s PS5-derived BC-250 mining APU — portable FidelityFX DLL cuts 1440p upscaling time from 11.51 ms to 5.92 ms”
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