FSR 4 on Nvidia GPUs: Yes, It Works

Why Would You Want FSR 4 on NVIDIA?

If you have an NVIDIA RTX card, you already have DLSS. Why bother with FSR 4?

Quality comparison. Early testing shows FSR 4’s ML-based upscaling is a significant leap over FSR 3. In some scenarios, it rivals DLSS 4.5 in image quality — especially in motion stability and fine detail preservation.

Game support. Some games support FSR 4 but not DLSS (or have poor DLSS implementations). FSR 4 gives you another option.

Frame generation. FSR 4’s frame generation works differently from DLSS frame gen, and some users prefer its motion handling in specific titles.

Curiosity. Running AMD’s technology on NVIDIA hardware is an intriguing technical exercise.

How FSR 4 on NVIDIA Works

AMD locked FSR 4 behind RDNA 4 by requiring FP8 (8-bit floating point) hardware support, which only the RX 9070 series has natively. But the community found a workaround.

The Int8 Method

Modders created a custom FSR 4 DLL that replaces AMD’s FP8 ML model with an Int8 (8-bit integer) version. Int8 is supported by a much wider range of hardware:

GPU Generation	FP8 (Official)	Int8 (Modded)
AMD RDNA 4 (RX 9070)	✅ Native	✅ Native
AMD RDNA 3 (RX 7900/7800/7600)	❌	✅ Works
AMD RDNA 2 (RX 6800/6700/6600)	❌	✅ Works
NVIDIA RTX 40-series	❌	✅ Works
NVIDIA RTX 30-series	❌	✅ Works (some cards)
NVIDIA GTX 16-series	❌	✅ Works (reported)

Notably, People are running FSR 4 on GTX 1660 Super cards. It’s not optimal, but it works.

Method 1: OptiScaler (Recommended)

OptiScaler is the most popular tool for running FSR 4 on unsupported hardware. It’s a replacement framework that lets you swap in-game upscalers — replacing DLSS, FSR 3, or XeSS with FSR 4.

Setup Steps

Download OptiScaler from GitHub
Download the FSR 4 Int8 DLL files
Extract OptiScaler into your game’s directory (alongside the .exe)
Place the FSR 4 DLL in the OptiScaler folder
Configure OptiScaler via its in-game overlay (Ctrl+Shift+O by default)
Select FSR 4 as your upscaler
Choose your preset — Balanced or Performance recommended

OptiScaler works with any game that supports DLSS 2, FSR 2/3, or XeSS. The GitHub wiki maintains a FSR 4 Compatibility List tracking which games work and which have issues.

What to Expect

Quality: Very close to native FSR 4 on RDNA 4. The Int8 conversion has minimal quality loss.
Performance: Slightly higher overhead than native FSR 4 due to the Int8→FP8 conversion layer. Usually 2-5% slower.
Stability: Generally stable, but some games have visual glitches. Check the compatibility list.

Method 2: Direct DLL Swap

For games that natively support FSR 4, you can sometimes replace the game’s FSR DLL with the Int8 version directly:

Locate the game’s FSR DLL (usually ffx_fsr4_x64.dll or similar)
Back up the original DLL
Replace with the Int8 version
Launch the game and enable FSR 4 in settings

This method is simpler but less reliable. Some games validate their DLLs, and the Int8 version may not be recognized. OptiScaler is the safer option.

FSR 4 vs DLSS 4.5: Quality Comparison on NVIDIA

How does FSR 4 compare to DLSS 4.5 when both are running on the same NVIDIA card?

Aspect	DLSS 4.5	FSR 4 (Int8)
Static Image Quality	Excellent	Very Good (slight edge to DLSS)
Motion Stability	Excellent	Good (more shimmer in some scenes)
Fine Detail	Excellent	Good (hair/foliage slightly softer)
UI/Text Clarity	Excellent	Good (minor ghosting on fast UI)
Frame Generation	Up to 6x (Multi Frame Gen)	Up to 2x (single frame gen)
Latency	Lower (Reflex integration)	Higher (no Reflex equivalent)
Ease of Use	Native, one-click	Requires OptiScaler setup

Bottom line: DLSS 4.5 is still better on NVIDIA hardware — it has the home-field advantage. But FSR 4 is surprisingly competitive, especially in static image quality. If a game has a poor DLSS implementation or doesn’t support DLSS at all, FSR 4 via OptiScaler is a legitimate alternative.

FSR 4 Multi-Frame Generation: Coming Soon

The biggest gap between FSR 4 and DLSS 4.5 is frame generation. NVIDIA’s Multi Frame Gen can generate up to 5 additional frames per rendered frame (6x total scaling), while FSR 4 currently maxes out at 2x (one generated frame).

But that’s about to change. AMD’s latest FSR SDK updates hint at multi-frame generation support coming soon:

New SDK references “ratio-based frame generation” with multiple ratios
Code mentions frame generation at 3x and 4x ratios
It’s unclear whether this will use ML or a traditional approach
RDNA 4 support is likely; support for older GPUs is unknown

If AMD delivers multi-frame generation that works across GPU vendors (including NVIDIA via OptiScaler), it could be a game-changer for gamers who don’t have RTX 50-series cards.

Should You Use FSR 4 on Your NVIDIA Card?

Yes, if:
– Your game has poor or no DLSS support
– You want to compare upscalers and find the best option
– You’re on an older RTX card and want more upscaling choices
– You’re curious and like tinkering

No, if:
– Your game already has DLSS 4.5 working well (stick with native)
– You want the simplest setup possible
– You need Multi Frame Generation (FSR 4 can’t match DLSS 4.5’s 6x scaling yet)

The Bigger Picture

The fact that FSR 4 works on NVIDIA hardware at all is a testament to AMD’s open approach. DLSS is locked to NVIDIA’s tensor cores — you can’t run it on AMD cards, period. FSR 4, despite being officially RDNA 4-only, is open enough that modders could make it work everywhere.

This matters for the industry. The more upscaling options gamers have, the less leverage any single GPU vendor has over the market. If FSR 4 becomes truly vendor-agnostic (even through mods), it puts pressure on NVIDIA to keep improving DLSS rather than resting on exclusivity.

AMD’s upcoming multi-frame generation could be the real inflection point. If they deliver a DLSS 5 competitor that works across GPU brands, the upscaling landscape changes dramatically.

Until then, OptiScaler + FSR 4 is a solid option for NVIDIA owners who want more choices. It’s not better than DLSS 4.5 on NVIDIA hardware — but it’s close enough to matter.