Fortnite serves as a showcase for Unreal Engine 5. In 'Performance Mode', it runs on almost anything. However, enabling 'Lumen' (global illumination) and 'Nanite' (virtualized geometry) requires a powerful RTX 30/40 series GPU to maintain 60 FPS. The building mechanics also add a significant CPU load, especially in competitive end-games with dense player structures.
Actual FPS may vary based on RAM speed, background processes, and other system factors
Performance Report
At 1080p, all quality settings exceed 156 FPS, suitable for 144Hz+ monitors. At 1440p, all settings exceed 124 FPS. At 4K, all settings exceed 72 FPS.
The GeForce RTX 4090 is 136% above the recommended GPU (GeForce GTX 1080) for Fortnite. The Ryzen 5 8645HS is 69% above the recommended CPU (Core i5-7300U).
The Ryzen 5 8645HS sets the FPS ceiling at all 1080p settings, 1440p (low/high/ultra), 4k (low/ultra), while the GeForce RTX 4090 still has headroom. The FPS ceiling is closely matched at 1440p medium, 4k (medium/high).
This section is based on estimated CPU/GPU FPS ceilings, not utilization percentages.
At 1080p ultra, the Ryzen 5 8645HS sets the ceiling at about 161 FPS, while the GeForce RTX 4090 could reach 198 FPS. In this scenario, the CPU limits the GPU potential by 19% (FPS gap: 37 FPS). Overall distribution: CPU limits 9/12 cells, GPU limits 0/12, balanced 3/12.
Your Ryzen 5 8645HS is the limiting side in the heaviest mismatch. This means part of the GeForce RTX 4090 rendering potential remains unused in those settings.
| Resolution | Low | Medium | High | Ultra |
|---|---|---|---|---|
| 1080p (Full HD) | CPU Limits GPU 17% | CPU Limits GPU 8% | CPU Limits GPU 11% | CPU Limits GPU 19% |
| 1440p (2K QHD) | CPU Limits GPU 14% | Balanced | CPU Limits GPU 6% | CPU Limits GPU 18% |
| 4K (Ultra HD) | CPU Limits GPU 6% | Balanced | Balanced | CPU Limits GPU 12% |
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.
| Resolution | Low | Medium | High | Ultra |
|---|---|---|---|---|
| 1080p (Full HD) | CPU60% - 88% <> GPU24% - 45% <> | CPU50% - 79% <> GPU62% - 72% <> | CPU23% - 54% <> GPU64% - 94% <> | CPU18% - 53% <> GPU65% - 94% <> |
| 1440p (2K QHD) | CPU55% - 70% <> GPU31% - 54% <> | CPU43% - 64% <> GPU73% - 91% <> | CPU17% - 49% <> GPU95% - 97% <> | CPU13% - 51% <> GPU93% - 97% <> |
| 4K (Ultra HD) | CPU58% - 72% <> GPU33% - 54% <> | CPU47% - 66% <> GPU73% - 93% <> | CPU24% - 47% <> GPU97% - 98% <> | CPU20% - 49% <> GPU95% - 98% <> |
The Ryzen 5 8645HS + GeForce RTX 4090 pairing runs this title with CPU utilization between 13% and 88% and GPU utilization between 24% and 98%. Ryzen 5 8645HS stays in a controlled operating range, while GeForce RTX 4090 carries most of the graphics load at heavier visual settings. As resolution scales, average GPU load rises from 65% at 1080p to 80% at 4K, while CPU averages move from 53% to 48%.
From a utilization perspective, this is a GPU-heavy load profile. At 4K (Ultra HD) High, the GeForce RTX 4090 averages 98% usage (97-98%), while the Ryzen 5 8645HS stays at 36% (24-47%). This shows the graphics pipeline is carrying most of the workload, but utilization alone does not define the FPS limiter.
At 1080p, averages sit around CPU 53% and GPU 65%. At 1440p, that shifts to CPU 45% and GPU 79%, and at 4K it reaches CPU 48% and GPU 80%. This shows that GPU demand scales sharply with resolution while CPU load remains comparatively stable.
4K (Ultra HD) Medium is the most balanced preset based on this dataset. It runs around CPU 56% (47-66%) and GPU 83% (73-93%), which keeps GeForce RTX 4090 well utilized without constant max-out behavior while Ryzen 5 8645HS remains stable for consistent frame delivery.
Current utilization does not show an urgent upgrade requirement for either component; the Ryzen 5 8645HS and GeForce RTX 4090 remain reasonably matched for this title.
Understanding Hardware Utilization: These percentages represent how much of your component's maximum processing power is actively being used during gameplay. They describe hardware load, but they do not directly tell you which component sets the FPS ceiling.
Important: a CPU or GPU can still be the FPS limiter without reaching 100% utilization. Two processors can both show 40% usage and still deliver very different frame rates, depending on per-core speed, cache, engine threading, driver overhead, and frame preparation efficiency.
Data generated by our Machine Learning engine trained on real-world benchmarks. Shows the approximate average utilization at each setting.
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 69% above and your GPU is 136% above the recommended specs. Ultra settings at 1080p, or High at 1440p/4K.
+69%vsrecommended
+136%vsrecommended
+247%vsminimum
+521%vsminimum
Yes, the Ryzen 5 8645HS paired with the GeForce RTX 4090 can run Fortnite smoothly up to 4k achieving around 72 FPS at Ultra quality. Your GPU is 136% above the recommended specs, and your CPU is 69% above the recommended requirements.
Price data is not currently available for this combination. In general, look for setups where the CPU and GPU are balanced — this ensures you're not overspending on one component that the other can't keep up with.
For Fortnite, upgrading the CPU would have the biggest impact on performance. The Ryzen 5 8645HS is currently the limiting factor — the GeForce RTX 4090 has extra headroom that a faster processor could take advantage of. This is especially noticeable at 1080p where CPU performance matters more. CPU-limited at: 1080p low, 1080p medium, 1080p high, 1080p ultra, 1440p low, 1440p high, 1440p ultra, 4k low, 4k ultra.
Fortnite does not currently support Frame Generation technologies like DLSS 3 or FSR 3. Your performance is based entirely on native rendering. If the game adds support in a future update, newer GPUs will benefit the most.
Fortnite requires at minimum a Core i3-3225 (CPU) and GeForce GTX 960 (GPU) with 8 GB RAM and 30 GB storage. For the recommended experience, you need a Core i5-7300U and GeForce GTX 1080 with 16 GB RAM. Your Ryzen 5 8645HS and GeForce RTX 4090 both exceed the recommended specs, so you're well-positioned for a great experience.
These Fortnite 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.
