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AMD FSR 4 Source Code Leaked - Probably Hackable for Older GPUs

Latest FSR 4 source code 'leak' lets you run AMD's AI upscaling tech on nearly any GPU — no Linux required​

News
By Zak Killian published 2 days ago
It's a bit hacky, but with some tweaking, older GPUs get a nice new upscaling option. Maybe it'll make Bl4 playable?


I tested it. First, on a Radeon RX 7800 XT connected to a 4K display, and then on a Ryzen AI Max+ 395's integrated Radeon 8060S connected to a 1440p display. In both cases, performance is a little rough; we saw about 4.1 ms to upscale to 4K on the RX 7800 XT, while the Radeon 8060S takes about 2.3 ms to upscale to 1440p. For those unfamiliar with frame times, 60 FPS equates to a frame time of 16.7 ms. Tacking on an extra 4.1ms for the upscale drops you from 60 to about 48 FPS, but we didn't see that kind of performance from either GPU because we were testing Cyberpunk 2077 in RT Ultra mode on Radeon hardware.


performance remained broadly playable on both GPUs, and the final image quality with FSR 4, while decidedly inferior to DLSS 4, is nonetheless an undeniable step up from FSR 3, and in fact also superior to Intel's XeSS—at least, the DP4a path available to non-Intel GPUs. In Cyberpunk 2077, FSR 4 clearly has fewer artifacts and less aliasing, although it's not flawless; we still saw some trailing on distant objects, and animated textures still throw it for a loop. Only NVIDIA's transformer-based DLSS 4 has resolved those issues.


https://www.tomshardware.com/pc-com...ling-tech-on-nearly-any-gpu-no-linux-required
 

Why this matters now: DLSS lock-in, XeSS, and consoles​

DLSS has been Nvidia’s stickiest moat: it’s good, and the best parts (frame gen) are limited to newer RTX parts. Intel’s XeSS already demonstrated that AI upscaling can fall back to shaders (DP4a) and still look decent, but adoption lags DLSS. AMD going all-in on a shader-based neural pipeline feels like a second attempt at the “works everywhere” promise—only now with ML-driven components beyond upscaling, including neural radiance cache that could make global illumination and RT more viable on mid-range hardware.

The console angle is massive. PS5 and Xbox Series systems run AMD silicon without dedicated AI blocks exposed for games. If Redstone’s compute path delivers stable image quality and sensible performance on those boxes, developers get a unified feature set across PC and console. That could accelerate adoption more than any PC-only tech ever could—and it would undercut the notion that you need Tensor cores to ship modern reconstruction and frame gen.

https://finalboss.io/amds-redstone-fsr-aims-to-run-on-any

On a beefy card with unused compute, fine. On older GPUs already compute-bound, adding neural upscaling plus frame gen could be a zero-sum trade: a higher “fps” number but more hitching or reduced RT quality because you had to drop effects to pay the shader bill. AMD will need to prove this works across the Steam hardware survey’s middle class—think GTX 1660/RTX 2060 up through RX 5700 and console-class RDNA 2/3—without turning every game’s settings menu into a compromise simulator.
 
Marees said:

Latest FSR 4 source code 'leak' lets you run AMD's AI upscaling tech on nearly any GPU — no Linux required​

News
By Zak Killian published 2 days ago
It's a bit hacky, but with some tweaking, older GPUs get a nice new upscaling option. Maybe it'll make Bl4 playable?


I tested it. First, on a Radeon RX 7800 XT connected to a 4K display, and then on a Ryzen AI Max+ 395's integrated Radeon 8060S connected to a 1440p display. In both cases, performance is a little rough; we saw about 4.1 ms to upscale to 4K on the RX 7800 XT, while the Radeon 8060S takes about 2.3 ms to upscale to 1440p. For those unfamiliar with frame times, 60 FPS equates to a frame time of 16.7 ms. Tacking on an extra 4.1ms for the upscale drops you from 60 to about 48 FPS, but we didn't see that kind of performance from either GPU because we were testing Cyberpunk 2077 in RT Ultra mode on Radeon hardware.


performance remained broadly playable on both GPUs, and the final image quality with FSR 4, while decidedly inferior to DLSS 4, is nonetheless an undeniable step up from FSR 3, and in fact also superior to Intel's XeSS—at least, the DP4a path available to non-Intel GPUs. In Cyberpunk 2077, FSR 4 clearly has fewer artifacts and less aliasing, although it's not flawless; we still saw some trailing on distant objects, and animated textures still throw it for a loop. Only NVIDIA's transformer-based DLSS 4 has resolved those issues.


https://www.tomshardware.com/pc-com...ling-tech-on-nearly-any-gpu-no-linux-required
Click to expand...
“FSR 4 on Older Radeon GPUs Tested: Improves Image Quality With Minor Performance Hit
by Cpt.Jank Today, 09:10 Discuss (3 Comments)
After AMD recently leaked its own FSR 4 libraries on its GPUOpen GitHub repo, replete with libraries that support older hardware, it was only a matter of time before enterprising modders started demonstrating how those libraries could be used to port FSR to older RDNA GPUs. An enterprising Reddit user and modder recently posted a how-to guide explaining how to get FSR 4 implemented in games on RDNA 2 GPUs, and the results reveal improved image quality at the cost of performance. There are other caveats, as well, like having to use a very outdated driver or dive deep into configuration files to rename DLL files to get the upscaler working.”
 
erek said:
“FSR 4 on Older Radeon GPUs Tested: Improves Image Quality With Minor Performance Hit
by Cpt.Jank Today, 09:10 Discuss (3 Comments)
After AMD recently leaked its own FSR 4 libraries on its GPUOpen GitHub repo, replete with libraries that support older hardware, it was only a matter of time before enterprising modders started demonstrating how those libraries could be used to port FSR to older RDNA GPUs. An enterprising Reddit user and modder recently posted a how-to guide explaining how to get FSR 4 implemented in games on RDNA 2 GPUs, and the results reveal improved image quality at the cost of performance. There are other caveats, as well, like having to use a very outdated driver or dive deep into configuration files to rename DLL files to get the upscaler working.”
Click to expand...
Works fine on Linux/ steam deck

On Windows you need to go for a older driver else you'll run into stability issues
 
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So of course FSR4 could work on RDNA 2. I wonder who made that prediction?
 
DukenukemX said:
So of course FSR4 could work on RDNA 2. I wonder who made that prediction?
Click to expand...
A very different FSR4 that removed the hurdle it had to eat the performance on RDNA 2, not sure how accurate tester are and the reporting of what they found but apparently:
The Radeon RX 9000 GPUs themselves see a slight hit when enabling FSR 4 (2-4%) despite offering full support for FSR 4. The older RDNA 3 GPUs see around a 7%-10% performance hit, but RDNA 2 takes the biggest hit with the reported 10-20% figure.

https://wccftech.com/amd-fsr-4-enabled-rx-6800-xt-rdna-2-gpu-performance-hit-higher-image-quality/

If int8 behave like that, maybe the FP8 FSR4 of 2024 will never work well enough to be useful on RDNA 2.
 
LukeTbk said:
A very different FSR4 that removed the hurdle it had to eat the performance on RDNA 2, not sure how accurate tester are and the reporting of what they found but apparently:
The Radeon RX 9000 GPUs themselves see a slight hit when enabling FSR 4 (2-4%) despite offering full support for FSR 4. The older RDNA 3 GPUs see around a 7%-10% performance hit, but RDNA 2 takes the biggest hit with the reported 10-20% figure.

https://wccftech.com/amd-fsr-4-enabled-rx-6800-xt-rdna-2-gpu-performance-hit-higher-image-quality/

If int8 behave like that, maybe the FP8 FSR4 of 2024 will never work well enough to be useful on RDNA 2.
Click to expand...
Guess it will depend on the game/system and how well internal resolution combined with FSR scales vs native.

If there even a 20% FPS benefit with FSR performance many will still opt for that especially if they’re on older hardware. While AMD probably wouldn’t deem it worth their trouble (man hours spent on driver support, along with less new GPU sales) can see plenty of 6xxx series taking the plunge especially since those cards were very good.


View: https://youtu.be/gTrfnLvZbu4?si=DB9Oooxy37BrU-K-
 
yinzerniner said:
if they’re on older hardware. While AMD probably wouldn’t deem it worth their trouble (man hours spent on driver support, along with less new GPU sales) can see plenty of 6xxx series taking the plunge especially since those cards were very good.
Click to expand...
I think the PS5 install base of RDNA 2 always made AMD feel it was worth the trouble (sony has well), RDNA 2 install base is a magnitude bigger than 3/4 combined will be after all.

I think in some game, a near 0% could be interesting to some (for the highest quality setting), getting rid of TAA noise, 4.x seem to be really good, the performance mode now being usuable for the huge boost is also an interesting one for sure
 
LukeTbk said:
A very different FSR4 that removed the hurdle it had to eat the performance on RDNA 2, not sure how accurate tester are and the reporting of what they found but apparently:
The Radeon RX 9000 GPUs themselves see a slight hit when enabling FSR 4 (2-4%) despite offering full support for FSR 4. The older RDNA 3 GPUs see around a 7%-10% performance hit, but RDNA 2 takes the biggest hit with the reported 10-20% figure.

https://wccftech.com/amd-fsr-4-enabled-rx-6800-xt-rdna-2-gpu-performance-hit-higher-image-quality/

If int8 behave like that, maybe the FP8 FSR4 of 2024 will never work well enough to be useful on RDNA 2.
Click to expand...
I'm OK with losing 10% to 20% performance while using FSR4. At least it's a choice now. Maybe in time the performance hit will get better?
 
DukenukemX said:
I'm OK with losing 10% to 20% performance while using FSR4. At least it's a choice now. Maybe in time the performance hit will get better?
Click to expand...
And it depends what they mean a 20% slower upscaler is not 20% less frames per second and one big caveat if FSR 4 performance look better than FSR 3 balanced even quality in some case, you can still look better without any performance hit.
 
early 2027 for the big install base is quite late (consoles, steam deck, etc...) ... at least that mean PS6 game that use it will have an easier time using it on PS5 has well.... if it require that much work it could even be more of an "4.1", share the name but quite different. In time for the steam machine at least, which is not a small deal.
 
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