Along with the launch of the first RDNA 4 GPUs, the RX 9070 XT and RX 9070, another major highlight is the debut of Team Red’s first AI-powered upscaling technology, FSR 4. This new ML-based technology offers massive uplifts over previous FSR iterations and has closed the gap with Nvidia’s DLSS much more than expected. However, the catch is that FSR 4 is currently exclusive to the RX 9070 series and hasn’t been modified or ported for RDNA 3 GPUs.

On top of that, early-on support for FSR 4 titles is also quite limited, with some titles only running on Windows 11. In response, modders developed OptiScaler, a tool that enables FSR 4 in any game that supports DLSS 2+ or Intel’s XeSS. All you need is an RDNA 4 GPU, and the tool will handle the rest.

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ASUS Prime RX 9070 XT OC

4.5 /5

Editor’s Rating

How We Review

Specifications

• GPU: Navi 48 XT
• Stream Processors: 4,096
• VRAM: 16GB GDDR6
• Memory Bus Width: 256-bit
• Base/Game/Boost clock speed: 1,660/2,400/2,970 MHz
• TBP: 304W

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Full path tracing with 60+ FPS at 1440p FSR 4 Performance is possible

Essentially, OptiScaler acts as a bridge between upscaling technologies and games, redirecting upscaling requests to a different supported technology. It achieves this by implementing API methods that mimic the functionalities of DLSS, XeSS, and FSR, allowing the game to think it’s still using the original upscaler. This makes it possible to switch between different upscaling technologies seamlessly.

The tool isn’t just for upscaling. It also enables features like Frame Generation in games that lack native support and even adds Anti-Lag support through Nvidia Reflex. But the real standout is the level of performance it brings. According to @highyieldYT, using OptiScaler with Cyberpunk 2077, a game that doesn't support FSR 4 or even FSR 3.1, the user achieved over 60 FPS at 1440p with FSR 4 enabled on the RX 9070 XT with full path tracing.

Check out the list of compatible games

That said, the mod itself works only on specifically compatible games, with the developer listing a total of 22 titles that have been tested by the developers and that support the FSR 4 compatibility mod. Nonetheless, it’s interesting to see open-source tools like OptiScaler bring upscaling technology like FSR 4 to more games.

1. Atomic Heart (tested on DLSS Input)
2. Avowed (tested on DLSS input)
3. Baldur’s Gate 3 (tested on DLSS input, need to use DX11 .exe. Arguably not worth due to lower performance than Vulkan w/o upscaler during tests)
4. Black Myth: Wukong
5. Control
6. Cyberpunk 2077 (Need to use FSR or XeSS inputs, Crashes on Windows 10)
7. Deep Rock Galactic (tested on DLSS Input)
8. Dragon’s Dogma II (set FGType=nofg)
9. Final Fantasy VII Rebirth (tested on DLSS Input)
10. Ghost of Tsushima (tested on FSR3 input)
11. Hitman: World of Assassination (Use DLSS or XeSS)
12. Horizon Zero Dawn Remastered
13. Jusant (DLSS inputs)
14. Kingdom Come: Deliverance II
15. Lies of P (tested on DLSS input)
16. Red Dead Redemption 2 (use DX12)
17. Senua’s Saga: Hellblade 2 (tested on DLSS input)
18. Silent Hill 2 Remake (tested on DLSS inputs)
19. Shadow of the Tomb Raider (tested on DLSS inputs)
20. Tokyo Xtreme Racer (tested on DLSS inputs)
21. Uncharted: Legacy of Thieves Collection (tested on DLSS inputs)
22. The Witcher 3 Next Gen (tested on XeSS inputs)

Source: OptiScaler

About the Author

Hassam Nasir

Hassam boasts over seven years of professional experience as a dedicated PC hardware reviewer and writer.