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FSR 4 modded to run on RDNA 2 GPUs improves image quality by "leaps and bounds," but carries 10% performance penalty —AMD's leaked source code turns into modding frenzy
['Hassam Nasir', 'Contributing Writer', 'The Historical Fidelity', 'Social Links Navigation']
Latest from Tom's Hardware
Last month, AMD accidentally made FSR 4 open-source by publishing the entire source code on GitHub, as part of its FidelitySDK.
That pushed modders to quickly reverse-engineer how to run FSR 4 on previously incompatible hardware, but the hacks were limited to Linux.
As such, they saw only 100-107 FPS in Stellar Blade when using FSR 4, compared to 110+ FPS on FSR 3.
Rather, they pitted an RX 7900 XTX against an RX 9070 XT — AMD's latest flagship purpose-built with FSR 4 in mind.
In Cyberpunk 2077, tested at 4K Ultra settings, the 9070 XT netted 77 FPS using FSR 3.1 and only 74 FPS using FSR 4.
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