Quick Answer
The real difference is that FSR 4 uses a machine-learning upscaler that needs an RX 9000-series GPU, while FSR 3.1 runs on almost any modern card, including older AMD and even Nvidia GPUs. FSR 4 delivers visibly cleaner image quality with far less shimmer. An RX 9070 XT build at Evetech sits around R40,000 and unlocks FSR 4's best results at 1440p and 4K.
FSR 4 vs FSR 3.1: The Core Split
FSR 3.1 is a hand-tuned spatial-plus-temporal upscaler that works broadly across hardware, which made it popular for SA gamers on a budget. FSR 4 swaps that for an AI-based model, similar in approach to DLSS, but it requires the dedicated hardware in RX 9000-series cards. The payoff is a major jump in image stability: thin fences, foliage, and fine textures hold together in motion instead of shimmering. FSR 3.1's frame generation remains available and decoupled, so you can pair FSR 4 upscaling with FSR frame generation in supported games.
Which One Fits Your Build
If you own an RX 7000-series, GTX, or RTX card, FSR 3.1 is your route and it still looks good at 1440p Quality. If you are buying a current AMD card, an RX 9070 or RX 9070 XT unlocks FSR 4 and the cleaner image it produces. At 1080p the gap is smaller, but at 1440p and 4K the AI model's stability advantage becomes obvious. For SA buyers weighing value, FSR 3.1 stretches an older GPU's life, while FSR 4 is a reason to choose RX 9000-series for a fresh build.
Getting the Best Result
Run FSR in Quality mode first and only drop to Balanced if you need more fps, since Quality preserves the most detail. Keep your GPU drivers current, as FSR 4 support and per-game profiles arrive through updates. Pair the upscaler with a FreeSync display so frame pacing stays smooth, and cap your frame rate just below the panel's refresh to avoid tearing. These habits matter more than the version number for day-to-day smoothness.
FAQ
Can my RX 7000-series card run FSR 4?
No. FSR 4's AI upscaler requires the dedicated hardware in RX 9000-series GPUs. RX 7000-series cards stay on FSR 3.1, which still delivers a solid image at Quality settings.
Does FSR 4 work in every game?
Not yet. FSR 4 support is rolling out title by title, and many games still ship with FSR 3.1. AMD's driver-level upgrade can force FSR 4 in some supported games, so keep drivers updated.
Is FSR 4 as good as DLSS 4?
FSR 4 closes most of the historic gap, with image stability now competitive with DLSS at 1440p and 4K. Small differences remain per game, but for most SA gamers the experience is now genuinely close.
Unlock FSR 4 image quality
Explore Evetech's Radeon RX 9000-series graphics cards to get the AI upscaler and cleaner motion at 1440p and 4K.