Modders unlock FSR 4 for Radeon GPUs in games without official support

[Daniel Sims]

Why it matters: FidelityFX Super Resolution 4 has brought upscaling on AMD's newest graphics cards closer to Nvidia's performance, though Team Red still trails in games supported. While AMD encourages developers to adopt FSR 4, modders are also doing their part.

Developers experimenting with a popular upscaling configuration tool have successfully implemented FSR 4 into games that don't officially support it. Though still in its early stages, Radeon RX 9000 GPU owners could soon play many more titles with AMD's latest super-resolution technology.

The well-regarded program DLSS Swapper injects newer versions of FSR or Nvidia DLSS into older games by replacing DLL files, letting users customize and enhance image quality. Until last week, retrieving DLLs for FSR 4 wasn't possible, but AMD's release of FidelityFX SDK 2.0 changed that.

Someone on our GitHub just did a manual DLL swap and got FSR 4 to work on a FSR 3.1 game

That means the SDK with those new FSR DLLs will allow any FSR 3.1 game to use FSR 4 sooner rather than later. https://t.co/EUAdkbk1JI

– DLSS Swapper (@dlss_swapper) August 28, 2025

Although AMD accidentally released and then quickly withdrew FSR 4's source code, it also deliberately provided files to help developers migrate games from FSR 3.1. The upgraded FSR 4 delivers noticeably improved visuals, but currently supports only a few dozen titles, compared with the 175 that offer DLSS 4.

Nvidia also released an official override to enable DLSS 4 in potentially hundreds of additional games. AMD users can activate a similar experimental driver in a few dozen titles, and the recent SDK release could help modders expand that selection further.

DLSS Swapper developers have injected FSR 4 DLLs into Horizon Zero Dawn Remastered and other titles by renaming specific files. However, the process remains buggy, particularly on Linux. The DLSS Swapper Twitter account expressed optimism that users will soon have another option to implement FSR 4 in any game that officially supports FSR 3.1.

OptiScaler is another experimental but powerful third-party tool. Although less mature than DLSS Swapper, it can switch upscaling methods in any title that supports DLSS 2, FSR 2, or XeSS. The tool lets users play hundreds of games with the solution that best suits their GPU, whether RTX, RX 7000, RX 9000, or Intel Arc.

AMD's source code leak also confirmed that the company is developing a method to enable a lightweight version of FSR 4 on RX 7000 cards. Third-party experiments indicate the results may be less effective than on the company's latest hardware, but still worth exploring.

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Modders unlock FSR 4 for Radeon GPUs in games without official support

 

[Puiu]

The problem isn't the swapping, it's emulating FP8 which has performance issues. Hopefully AMD manages to improve it a bit if they ever release it in an official capacity.

 

[Theinsanegamer]

The problem isn't the swapping, it's emulating FP8 which has performance issues. Hopefully AMD manages to improve it a bit if they ever release it in an official capacity.

That's for running fsr4 on rdna 3. This article is talking about replacing earlier far or does implementations with fsr4. Totally different wheelhouse.

 

[Puiu]

That's for running fsr4 on rdna 3. This article is talking about replacing earlier far or does implementations with fsr4. Totally different wheelhouse.

That part yes, but the article does say the following at the end:

"AMD's source code leak also confirmed that the company is developing a method to enable a lightweight version of FSR 4 on RX 7000 cards."

 

[ioliveirafarias]

IF Nvidia dont improve hardware at mid range, maybe the RTX 50 super series may be surpassed by AMD and optiscaler

 

[darkzelda]

This doesn't sound as impressive as optiscaler. For example, I've been using FSR4 in Baldur's Gate 3 with the help of Optiscaler, a game that only supports Nvidia's DLSS and AMD's FSR 2. As an owner of a 9070 XT, optiscaler has made me even happier with my purchase.

 

[cfenton]

How many games support FSR 3.1? FSR 4 support is awful, so anything would help, but I've been very disappointed since getting my 9070XT. With my 3070, I could pretty much assume any game that would benefit from upscaling would support DLSS. With the 9070XT, most games don't support FSR 4. Luckily the 9070XT is fast enough to run most games with good performance without upscaling, but that won't last. AMD should have an official tool that works like Optiscaler to ensure every game that has DLSS support also has FSR 4 support.

 

[Q Wales]

How long ago was it that we were able to take images on our mobile phones that were so detailed the eye couldn't detect any improvement?.. What was it, somewhere around the 6 megapixel mark? Must be close to 10 years ago maybe.. Why is it taking sooo long for GPU's to be able to do the same without breaking a sweat?