The latest version of AMD's FidelityFX, typically known as FSR 4, delivers a markedly superior result to FSR 3, making it a big win for those who can run it. But that privileged group is limited to folks with AMD Radeon RX 9000 series GPUs based on the company's RDNA 4 architecture. Or is it? As it turns out, you can actually run FSR 4 on nearly any GPU, thanks to AMD itself leaking the source code last month.
Strictly speaking, this isn't exactly 'new' news. As far back as June of this year, people were hacking FSR4 onto last-generation Radeon RX 7000 GPUs, but that trick was fragile and required Linux. Today's method is quite easy and should, in theory, work on virtually any modern GPU in the vast majority of DirectX 12, DirectX 11, and Vulkan games. We'll get to the specifics in a moment, but we should explain exactly what's going on here.
