Fortnite

The Intel Core i5-9400 paired with the NVIDIA GeForce RTX 3070 presents a distinctive performance profile in Fortnite, characterized by a substantial variance in frame rates depending on resolution and quality settings. The benchmark data shows a clear pattern where the GPU’s capabilities are progressively constrained by the CPU as resolution decreases, while the opposite occurs at 4K. This analysis breaks down the measured FPS to understand the balance of this combination.

Resolution Scaling

The data reveals a classic scaling curve for this combo, with frame rates dropping sharply as resolution increases. At 1080p with High settings, the combo produces an average of 151.9 FPS. Moving to 1440p, that figure drops to 94.6 FPS, a reduction of approximately 38%. At 4K, the average falls to 51.3 FPS, which represents a further 46% decline from the 1440p figure. This steep decline suggests that the system is heavily GPU-bound at higher resolutions, as the RTX 3070’s rendering workload increases exponentially with pixel count.

However, the scaling pattern is not uniform across all settings. With Low settings, the transition from 1080p (277.8 FPS) to 1440p (176.5 FPS) results in a 36% drop, but the subsequent shift to 4K (92.9 FPS) is a more dramatic 47% reduction. The Ultra preset shows a different behavior: 1080p produces 100.6 FPS, 1440p falls to 63.6 FPS, and 4K drops to 36.5 FPS. The consistent percentage drops indicate that the limiting factor remains the GPU’s pixel throughput, even at lower quality settings where the CPU could theoretically keep pace.

The data indicates that at 1080p, the CPU begins to emerge as a potential bottleneck, particularly at Low settings where the frame rate of 277.8 FPS approaches the practical limit for a six-core, six-thread processor without hyper-threading. The gap between Low and Medium settings at 1080p is 80 FPS, whereas at 4K that same gap narrows to just 24.3 FPS. This compression of performance differences at higher resolutions confirms that the RTX 3070’s fill rate becomes the dominant constraint, while the i5-9400’s six physical cores provide sufficient throughput for lower resolution workloads.

Settings Recommendations

For users prioritizing a smooth competitive experience, the Low preset at 1440p offers a compelling balance, delivering 176.5 FPS. This is over 70% higher than the High preset at the same resolution and remains well above the refresh rate of most high-end monitors. At 1080p, the Low preset’s 277.8 FPS is exceptional for fast-paced play, though the Medium preset’s 197.8 FPS still provides an excellent experience with improved visual fidelity.

At 4K, the choice becomes more constrained. The Medium preset yields 68.6 FPS, which is playable for a Battle Royale title, while High drops to 51.3 FPS and Ultra falls to a less fluid 36.5 FPS. The data suggests that for 4K users, the Medium preset is the optimal trade-off, as it maintains a frame rate above 60 FPS while providing a substantial visual upgrade over the Low preset’s 92.9 FPS. The Ultra preset is not recommended at any resolution for this combo, as even at 1080p it only achieves 100.6 FPS, which is a significant reduction from the Medium preset’s 197.8 FPS.

The benchmark results indicate that the High preset at 1440p (94.6 FPS) is a reasonable choice for users with 144Hz displays who value visual quality, but the Medium preset at 1080p (197.8 FPS) offers a more responsive experience for competitive play. The Low preset at 1080p provides the highest headroom for frame rate, which is critical in a game where reaction time matters.

How This Combo Ranks

Within the benchmark database, this specific combination of the Intel Core i5-9400 and the NVIDIA GeForce RTX 3070 ranks 676 out of 1564 tested combos for Fortnite. This places it in the upper-middle tier of all possible pairings, indicating that it outperforms a majority of systems while not reaching the top echelon. The ranking reflects a balanced setup that is capable of high frame rates but is limited by the CPU’s mid-range positioning.

The combo’s rank is influenced by the CPU’s performance percentile of 50, meaning it sits exactly at the median of all tested processors. The RTX 3070, however, ranks in the 72nd percentile among all GPUs, showing that the graphics card is the stronger component in this pairing. The disparity in component tiers means that the system’s overall ranking is dragged down by the CPU, which is a common outcome when pairing a previous-generation mid-range processor with a high-end graphics card.

The nearest rivals for the CPU in synthetic benchmarks include the Intel Core i3-10305, which scores 2300 against the i5-9400’s 2305, a negligible 0.2% difference. This proximity in average benchmark scores suggests that the i5-9400 performs similarly to a newer i3, which is a notable observation given the difference in core counts. The GPU’s nearest rival, the AMD Radeon RX 6600 XT, scores 27985 against the RTX 3070’s 28238, a 0.9% difference, indicating that the 3070 holds a slight edge in raw performance metrics.

Measured FPS Breakdown

The measured FPS data provides a comprehensive view of how this combo handles various settings. At 1080p, the full range of presets is usable: Low averages 277.8 FPS, Medium 197.8 FPS, High 151.9 FPS, and Ultra 100.6 FPS. The spread from Low to Ultra is 177.2 FPS, which demonstrates that the RTX 3070 has ample headroom at this resolution, but the CPU’s six threads limit the absolute maximum frame rate.

At 1440p, the averages shift to 176.5 FPS for Low, 126.1 FPS for Medium, 94.6 FPS for High, and 63.6 FPS for Ultra. The scaling here is more linear, with each preset step reducing the frame rate by roughly 30%. The 1440p Low setting is particularly notable, as it remains above the 144Hz threshold, making it a viable option for high-refresh-rate gaming without sacrificing too much visual clarity.

At 4K, the averages are significantly lower: 92.9 FPS for Low, 68.6 FPS for Medium, 51.3 FPS for High, and 36.5 FPS for Ultra. The drop from Low to Medium at 4K is 24.3 FPS, which is a smaller absolute difference than at lower resolutions, confirming that the GPU is the primary bottleneck. The Ultra preset at 4K produces a frame rate that is below the threshold for smooth gameplay in a fast-paced shooter, making it largely impractical.

GPU Role

The NVIDIA GeForce RTX 3070 is built on the Ampere architecture and features 8 GB of GDDR6 memory on a 256-bit bus, providing a bandwidth of 448.0 GB/s. This memory configuration is sufficient for Fortnite at all tested resolutions, as the game’s textures and geometry do not exceed the 8 GB capacity even at 4K Ultra settings. The GPU’s boost clock of 1725 MHz and base clock of 1500 MHz, combined with 5888 shading units, deliver a peak FP32 performance of 20.31 TFLOPS.

The RTX 3070’s 72nd percentile ranking among all GPUs indicates that it is a strong performer, but its measured results in Fortnite show that it is not fully utilized at lower resolutions. The GPU’s 184 texture mapping units and 96 render output units contribute to a pixel rate of 165.6 GPixel/s and a texture rate of 317.4 GTexel/s, which are the key specifications for rasterization-heavy games like Fortnite. The data suggests that the GPU is capable of much higher frame rates than the CPU allows at 1080p, as evidenced by the 277.8 FPS Low preset result.

The GPU’s memory clock of 1750 MHz (14 Gbps effective) ensures that the memory bandwidth does not become a limiting factor, even at 4K. The 8 GB capacity is adequate for the current state of Fortnite, and the benchmark results show no signs of memory-related stuttering or performance degradation. The RTX 3070’s performance in this game aligns with its position as a high-end card from the GeForce 30-series, which is further supported by its DirectX 12 Ultimate support and Vulkan 1.4 compatibility.

CPU Role

The Intel Core i5-9400 is a six-core, six-thread processor based on the Coffee Lake architecture, with a base clock of 2.90 GHz and a boost clock of 4.10 GHz. Its 9 MB of shared L3 cache and dual-channel DDR4 memory support with 42.7 GB/s bandwidth are typical for its generation. The CPU’s 50th percentile ranking places it at the median of all processors, and its average benchmark score of 2305 is nearly identical to that of the Intel Core i3-10305, which scores 2300.

In Fortnite, the CPU’s role is most evident at 1080p with Low settings, where the frame rate reaches 277.8 FPS. This high value suggests that the GPU is not the limiting factor at this resolution and preset, and the CPU’s six threads are managing the game’s draw calls and physics calculations. However, the lack of hyper-threading means that the CPU can only handle a limited number of concurrent tasks, which may cause frame rate fluctuations in chaotic battle scenarios with many players on screen.

The CPU’s boost clock of 4.10 GHz provides adequate single-thread performance, which is crucial for Fortnite’s game engine. The Cinebench R23 single-core score of 1125 supports this, though it is not exceptional by modern standards. The CPU’s 65 W TDP and end-of-life production status indicate that it is a previous-generation part, and its performance in Fortnite reflects that positioning. The data shows that the i5-9400 can support frame rates above 100 FPS at 1080p for most settings, but it becomes a bottleneck when paired with a GPU as powerful as the RTX 3070 at lower resolutions.