Weeks after AMD FSR 4 supply code was by chance leaked on-line, players have been placing it to the take a look at on older RDNA 2 and three playing cards, with some stunning outcomes. In response to the exams, operating the upscaling tech on older AMD playing cards just like the AMD Radeon RX 6800 XT ends in much better picture high quality for probably the most half, with solely a small drop in efficiency.
To this point, AMD hasn’t formally enabled FSR 4 on older graphics playing cards, limiting its accessibility to its brand-new RDNA 4 GPUs just like the AMD Radeon RX 9070 XT, which we suggest in our greatest graphics card information. These mods, nonetheless, show that the brand new tech can work on older GPUs, even when it is not the best course of to allow.
This course of was made potential by the FSR 4 supply code leak a couple of weeks in the past. Since then, modders have been making an attempt to implement FSR 4 in video games utilizing older playing cards. A number of posts have since popped up on Reddit showcasing the outcomes, together with this publish the place person nuubcake11 showcased FSR 4 working in Cyberpunk 2077 on an AMD Radeon RX 7900 XTX graphics card.
To get it working, nuubcake11 used a customized FSR 4 DDL file, which replaces FP8 with Int8. FP8 is an 8-bit floating-point quantity format designed for quick math in AI workloads, however these operations are solely supported on the newer AI cores in RDNA 4 GPUs. Int8, in contrast, is a lower-precision 8-bit integer format that is extra extensively supported on older {hardware} like RDNA 3. By swapping FP8 directions for Int8, and patching the outcome into the sport utilizing the open-source OptiScaler instrument, they had been capable of make FSR 4 run on these older AMD GPUs that in any other case would not assist it.
The top result’s a lot improved picture high quality, with solely a small drop in body charges. For instance, nuubcake11 noticed a body charge drop from 84fps at 1440p, with maxed out graphics settings and ray tracing enabled, to 79fps after switching from FSR 3.1.5 to FSR 4. This small efficiency drop is offset by the improved graphics, which, on condition that FSR 3 appears horrible, could be a worthwhile trade-off.
The method is not excellent, nonetheless. Some customers on this Reddit publish, the place person bukankema was capable of run FSR 4 in Cyberpunk 2077 on a good older RDNA 2-era RX 6800 XT, utilizing the GPU’s shader cores to course of the directions, as these older AMD GPUs haven’t any devoted AI cores.
This person stories some uncommon points on Home windows, together with some ghosting. That seems to be restricted to RDNA 2 GPUs, nonetheless, indicating that there are nonetheless some limitations if you happen to allow FSR 4 on this approach.
Whereas AMD hasn’t formally introduced incoming FSR 4 assist for these older GPUs, its upcoming FSR Redstone tech appears set to bypass AI cores fully, which means you could possibly run AMD’s next-gen FSR upscaling and body gen tech on any GPU, together with Nvidia ones.
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