Rust

The Intel Core i5-9400 and NVIDIA GeForce RTX 3070 combination delivers a highly playable Rust experience, but the data reveals a system that is clearly bound by its processor at lower resolutions and by its graphics card at 4K Ultra. The CPU’s 6 cores and 6 threads, running at a base clock of 2.90 GHz and a boost of 4.10 GHz, provide the baseline for frame pacing. With an L3 cache of 9 MB (shared) and dual-channel DDR4 memory support, the i5-9400 is a capable mid-range part, evidenced by its Cinebench R23 multi-core score of 7969 and single-core score of 1125. This puts it at the 50th percentile among all CPUs, nearly matching the Intel Core i3-10305 (0.2% delta) and the Intel Core i3-1125G4 (0.2% delta), while trailing the Intel Core i7-8809G by 0.6%. For a game like Rust, which is known for its physics and world simulation, the single-thread performance is critical; the data suggests that the CPU’s 4.10 GHz boost clock is sufficient to keep the RTX 3070 fed at 1080p, but not necessarily at higher resolutions where the GPU takes over.

How This Combo Ranks

The pairing of the i5-9400 with the RTX 3070 holds a combo rank of 783 out of 1717 tested combinations in Rust. This places it in the upper-middle tier of all possible pairings, indicating that while the GPU is strong, the six-thread CPU holds the overall system back from the top echelons. The RTX 3070’s individual performance is noteworthy, with a percentile of 72 among all GPUs and an average benchmark score of 28238. This is 0.9% ahead of the AMD Radeon RX 6600 XT and 1% ahead of the NVIDIA GeForce GTX 980 Ti, while being 0.6% behind the AMD FirePro S7150. The 783rd rank out of 1717 combos suggests that many other systems with faster processors paired with similar or weaker GPUs achieve higher average frame rates in Rust. The bottleneck is evident: the CPU’s average benchmark score of 2305 is only 0.2% different from the Intel Core i3-10305, meaning it is statistically equivalent to a modern quad-core, which limits the GPU’s potential in CPU-bound scenarios.

Resolution Scaling

The measured FPS data shows a clear pattern of diminishing returns as resolution increases, which is the classic signature of a CPU bottleneck at low resolutions transitioning to a GPU bottleneck at high resolutions. At 1080p Ultra, the combo produces 77.6 FPS, but dropping to 1440p Ultra yields 52.5 FPS, a 32% decrease. Moving to 4K Ultra, the frame rate falls to 31.9 FPS, another 39% drop from 1440p. This steep decline at Ultra settings indicates that the GPU is the primary limiter at higher resolutions. However, at Low settings, the scaling is different. At 1080p Low, the system achieves 141.7 FPS. At 1440p Low, it reaches 126.9 FPS, only a 10% drop, suggesting the CPU is holding the frame rate back. At 4K Low, the FPS is 75.7, a 40% drop from 1440p, showing that the GPU becomes the bottleneck even at low settings when resolution is pushed to 4K. The data indicates that the i5-9400 is sufficient to push high frame rates at 1080p, but the RTX 3070’s raw throughput is what governs performance at 4K.

Measured FPS Breakdown

The complete set of measured FPS values provides a detailed view of the system’s behavior across four settings presets and three resolutions. At 1920x1080, the average frame rates are 141.7 FPS on Low, 123.6 FPS on Medium, 106.2 FPS on High, and 77.6 FPS on Ultra. This shows a smooth progression where each settings tier reduces performance by roughly 15-20%. At 2560x1440, the figures are 126.9 FPS on Low, 86.8 FPS on Medium, 74.8 FPS on High, and 52.5 FPS on Ultra. The jump from Low to Medium at 1440p is a 32% drop, which is steeper than the 13% drop from Low to Medium at 1080p, indicating that the GPU is starting to feel the load at 1440p. At 3840x2160, the results are 75.7 FPS on Low, 51 FPS on Medium, 44.8 FPS on High, and 31.9 FPS on Ultra. Here, the drop from Low to Medium is 33%, and from High to Ultra is 29%. The 4K Low result of 75.7 FPS is higher than the 1080p Ultra result of 77.6 FPS, which is remarkable and confirms that the GPU is the limiting factor at 4K, as it can still produce playable frame rates even on the lowest settings.

GPU Role

The NVIDIA GeForce RTX 3070 is the dominant component in this pairing, and its specifications explain why it performs so well in Rust. With 8 GB of GDDR6 memory on a 256-bit bus, it offers a memory bandwidth of 448.0 GB/s, which is ample for the game’s textures and world data. 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. This raw compute power is evident in the 3DMark Steel Nomad DX12 score of 3162 and a Passmark G3D score of 22214. The GPU’s 72nd percentile ranking among all GPUs, with an average benchmark score of 28238, places it just 0.9% ahead of the AMD Radeon RX 6600 XT. In Rust, the 4K Ultra result of 31.9 FPS is the only sub-60 FPS measurement across all settings, proving that the RTX 3070 can handle the game at high frame rates unless settings and resolution are maxed out simultaneously. The 8 GB VRAM is sufficient, as the data does not show any out-of-memory related crashes or severe frame drops at 4K Ultra.

Settings Recommendations

Based on the measured rows, the optimal balance of visual fidelity and performance is achieved at 1440p High, which yields 74.8 FPS. This is above the 60 FPS threshold and provides a significant visual upgrade over Low settings. At 1080p, the High preset at 106.2 FPS is also excellent, but the 1440p High result offers a better use of the RTX 3070’s capabilities. For players with 4K displays, the Low preset at 75.7 FPS is the only playable option, as the Medium preset drops to 51 FPS and Ultra falls to 31.9 FPS. The data strongly suggests that the Ultra preset is not recommended for this combo, as the performance penalty from High to Ultra is 27% at 1080p (106.2 to 77.6 FPS), 30% at 1440p (74.8 to 52.5 FPS), and 29% at 4K (44.8 to 31.9 FPS). The visual gains from Ultra are typically marginal in Rust, so the High preset provides the best experience per the measured rows, especially at 1440p where the frame rate remains fluid.

FAQ

Q: What is the best resolution and settings combo for this system in Rust?

A: The data shows that 2560x1440 with High settings produces 74.8 FPS, which is the highest frame rate above 60 FPS at a resolution higher than 1080p. This offers the best balance of visual quality and smooth gameplay.

Q: Is this system capable of running Rust at 4K?

A: Yes, but only at Low settings, which achieves 75.7 FPS. At 4K Ultra, the frame rate drops to 31.9 FPS, which is not playable for most users.

Q: How does the CPU bottleneck affect performance at 1080p?

A: At 1080p Low, the system achieves 141.7 FPS, but at 1440p Low it only drops to 126.9 FPS, a 10% decrease. This smaller drop compared to higher settings indicates that the Intel Core i5-9400 is the limiting factor at 1080p, preventing the RTX 3070 from reaching even higher frame rates.

Q: How does the RTX 3070 compare to its nearest rivals in this game?

A: The RTX 3070’s average benchmark score is 0.9% higher than the AMD Radeon RX 6600 XT and 1% higher than the NVIDIA GeForce GTX 980 Ti. It is 0.6% lower than the AMD FirePro S7150, but that is a workstation card.

Q: What is the performance difference between High and Ultra settings?

A: The difference is substantial. At 1080p, High yields 106.2 FPS while Ultra yields 77.6 FPS, a 27% drop. At 1440p, High gives 74.8 FPS while Ultra gives 52.5 FPS, a 30% drop.

Q: Does the CPU’s performance match its rivals?

A: The Intel Core i5-9400 has an average benchmark score of 2305, which is 0.2% higher than the Intel Core i3-10305 and 0.4% higher than the Intel Xeon E-2134. It is 0.6% lower than the Intel Core i7-8809G, indicating it is effectively a mid-range part.