Weeks after AMD FSR 4 supply code was by accident 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 simplest course of to allow.
This course of was made potential by the FSR 4 supply code leak a number of weeks in the past. Since then, modders have been attempting 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 submit the place consumer 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, against this, 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 help 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 price 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 to be like horrible, could be a worthwhile trade-off.
The method is not good, nonetheless. Some customers on this Reddit submit, the place consumer 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 don’t have any devoted AI cores.
This consumer studies 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 should you allow FSR 4 on this method.
Whereas AMD hasn’t formally introduced incoming FSR 4 help for these older GPUs, its upcoming FSR Redstone tech appears to be like set to bypass AI cores utterly, which means you might be able to run AMD’s next-gen FSR upscaling and body gen tech on any GPU, together with Nvidia ones.
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