As the world's most popular MOBA, League of Legends runs on a proprietary engine that has been updated for over a decade. Recently, Riot increased the minimum requirements to include AVX instruction support and dropped support for older OSs and DirectX 9. While still lightweight, modern team fights with complex particle effects can strain older integrated graphics. The game scales well with single-thread CPU performance, meaning even modern entry-level processors can deliver high frame rates.
Actual FPS may vary based on RAM speed, background processes, and other system factors
Performance Report
At 1080p, all quality settings exceed 450 FPS, suitable for 144Hz+ monitors. At 1440p, all settings exceed 320 FPS. At 4K, all settings exceed 196 FPS.
The GeForce RTX 4090 is 1277% above the recommended GPU (GeForce GTX 560) for League of Legends. The Ryzen 9 3900X is 408% above the recommended CPU (Core i5-3330).
League of Legends supports: AFMF. This game does not have native DLSS 3 or FSR 3 Frame Generation support. AFMF is AMD-exclusive and not compatible with GeForce RTX 4090.
At lower resolutions (4k (medium/high/ultra)), the Ryzen 9 3900X sets the FPS ceiling. As graphical load increases at (1080p (medium/high/ultra), 1440p high), the GeForce RTX 4090 becomes the FPS-limiting side. The FPS ceiling is closely matched at 1080p low, 1440p (low/medium/ultra), 4k low.
Approximated average price on current market:
Combo price: $2090. At 1080p Ultra, this combo delivers 450 FPS, equivalent to 0.22 FPS per dollar.
| Resolution | Low | Medium | High | Ultra |
|---|---|---|---|---|
| 1080p | 0.335 fps/$ | 0.287 fps/$ | 0.239 fps/$ | 0.215 fps/$ |
| 1440p | 0.243 fps/$ | 0.208 fps/$ | 0.189 fps/$ | 0.153 fps/$ |
| 4k | 0.175 fps/$ | 0.152 fps/$ | 0.122 fps/$ | 0.094 fps/$ |
* Table values represent FPS per Dollar (higher is better)
This section is based on estimated CPU/GPU FPS ceilings, not utilization percentages.
At 1080p ultra, the GeForce RTX 4090 sets the ceiling at about 396 FPS, while the Ryzen 9 3900X has headroom up to 450 FPS. In this scenario, the GPU limits the CPU potential by 12% (FPS gap: 54 FPS). Overall distribution: GPU limits 4/12 cells, CPU limits 3/12, balanced 5/12.
The Ryzen 9 3900X and GeForce RTX 4090 stay close in effective frame-generation ceiling across most presets, so neither side consistently suppresses the other by a large margin.
| Resolution | Low | Medium | High | Ultra |
|---|---|---|---|---|
| 1080p (Full HD) | Balanced | GPU Limits CPU 7% | GPU Limits CPU 10% | GPU Limits CPU 12% |
| 1440p (2K QHD) | Balanced | Balanced | GPU Limits CPU 10% | Balanced |
| 4K (Ultra HD) | Balanced | CPU Limits GPU 7% | CPU Limits GPU 7% | CPU Limits GPU 9% |
We estimate the maximum FPS the processor can sustain and the maximum FPS the graphics card can sustain in each setting, then compare those limits directly.
Limit Factor formula: (stronger - weaker) / stronger. Example: if CPU ceiling is 200 FPS and GPU ceiling is 140 FPS, then GPU limits CPU by 30%.
CPU Limits GPU means the processor ceiling is lower. GPU Limits CPU means the graphics ceiling is lower. Balanced means the FPS ceilings are close enough that the gap is negligible.
A component can still be the FPS limiter without reaching 100% utilization. The displayed percentages are derived from FPS ceilings, not generic utilization heuristics.
See how your processor and graphics card compare against the game official minimum and recommended system specs. The placement of your hardware is calculated using relative synthetic performance scores to help you gauge overall playability.
Your CPU is 408% above and your GPU is 1277% above the recommended specs. Ultra settings at 1080p, or High at 1440p/4K.
+408%vsrecommended
+1277%vsrecommended
+1450%vsminimum
+6755%vsminimum
Yes, the Ryzen 9 3900X paired with the GeForce RTX 4090 can run League of Legends smoothly up to 4k achieving around 196 FPS at Ultra quality. Your GPU is 1277% above the recommended specs, and your CPU is 408% above the recommended requirements.
This CPU + GPU combo costs approximately $2090 ($441 CPU (Rank #267 Value) + $1649 GPU (Rank #77 Value)). Your GeForce RTX 4090 provides phenomenal top-tier performance but at a premium enthusiast price. Since you are essentially at the ceiling of current hardware capabilities, there are no meaningful performance upgrades available. However, if you wanted a more cost-effective build that still delivers a great experience, you could theoretically step down to a high-end card with a significantly better value rating.
Your GeForce RTX 4090 is already a top-tier graphics card. While it's technically the limiting factor here (which means you are fully utilizing your GPU's visual horsepower exactly as intended), there is no meaningful upgrade path that would drastically improve your League of Legends performance right now. GPU fully utilized at: 1080p high, 1080p medium, 1080p ultra, 1440p high. CPU-limited at: 4k high, 4k medium, 4k ultra.
League of Legends currently only supports AFMF (AMD Fluid Motion Frames) for frame generation, which is an AMD-exclusive technology. Because you are using an NVIDIA GPU, you cannot use Frame Generation for this specific game.
League of Legends requires at minimum a Core i3-530 (CPU) and GeForce 9600 GT (GPU) with 2 GB RAM and 16 GB storage. For the recommended experience, you need a Core i5-3330 and GeForce GTX 560 with 4 GB RAM. Your Ryzen 9 3900X and GeForce RTX 4090 both exceed the recommended specs, so you're well-positioned for a great experience.
These League of Legends FPS results are not arbitrary numbers. They come from calculations informed by thousands of real gaming benchmarks, and the typical accuracy range is around 10% to 15%. That makes them far more useful than generic FPS calculators that simply invent values without a benchmark foundation. Actual in-game performance can still vary with drivers, updates, RAM configuration, cooling, and the exact scene being rendered.
Performance estimates are based on synthetic benchmarks and hardware capabilities.
Results may vary based on drivers, OS, and background processes.
