Rust

The Intel Core i5-10400F paired with the NVIDIA GeForce RTX 4090 presents a striking imbalance in Rust: a mid-range 2020 CPU driving one of the fastest consumer GPUs ever made. The recorded data for this combo reveals that the RTX 4090 is rarely the limiting factor, and the i5-10400F's six cores and twelve threads often dictate the final frame rates. The measurements in this database show a system that is overwhelmingly playable, but the question is not whether it can run Rust, but how much of the RTX 4090's potential is actually being harnessed.

Best Settings per Resolution

The database's measured FPS values indicate that this combo is capable of maintaining 60 FPS at all tested resolutions, but the maximum quality preset that achieves this varies significantly. The most demanding preset that stays at or above 60 FPS is the target for playability.

At 3840x2160 (4K), the most demanding playable preset is High, which delivers an average of 74 FPS. The Ultra preset falls short of the 60 FPS threshold, recording an average of only 56.8 FPS. Medium settings are also playable at 87.5 FPS, and Low pushes to 109 FPS, but High is the best visual quality that still clears the playable bar.

At 2560x1440 (1440p), the data shows that Ultra settings are fully playable, with an average of 95.9 FPS. This is a significant jump from 4K, as the GPU has more headroom to render at higher settings. High, Medium, and Low presets all exceed 60 FPS as well, but Ultra is the optimal choice for maximum visual fidelity.

At 1920x1080 (1080p), the Ultra preset again takes the top spot, averaging 107.2 FPS. This is the highest quality setting and still maintains a very comfortable frame rate well above the 60 FPS threshold. All other presets, from Low at 148.4 FPS to High at 120.9 FPS, are also playable, but Ultra offers the best experience.

CPU and GPU Roles

The data reveals a classic CPU-bound scenario at lower resolutions, with the GPU becoming progressively more relevant as resolution increases. This is a direct result of the i5-10400F's position relative to the RTX 4090.

At 1920x1080, the CPU is the primary bottleneck. The difference between Low and Ultra settings is only 41.2 FPS (148.4 vs. 107.2), which is a modest 27.8% drop. This small scaling suggests that the RTX 4090 is not being fully utilized; the CPU is likely reaching its limit in terms of draw calls and game logic, preventing higher frame rates even at lower graphical loads.

At 2560x1440, the GPU begins to take on more responsibility. The scaling between Low (132.6 FPS) and Ultra (95.9 FPS) is a 36.7 FPS difference, a slightly larger percentage drop (27.7%) than at 1080p. This shows that the GPU's rendering load is increasing, but the CPU is still a significant factor, as the frame rates are still very high.

At 3840x2160, the GPU becomes the dominant constraint. The Ultra preset (56.8 FPS) is 52.2 FPS lower than the Low preset (109 FPS), a 47.8% reduction. This is a clear sign that the RTX 4090 is now working at a much higher capacity, and the CPU is no longer the primary limit. The fact that 4K Ultra drops below 60 FPS while 1440p Ultra stays above 90 FPS is a direct indicator of the GPU's rendering limits at higher resolutions.

The CPU's role is also highlighted by the absolute FPS figures. At 1080p Low, the system reaches 148.4 FPS, which is a strong score for any CPU. However, a faster CPU would likely push this number higher, as the RTX 4090 is capable of far more. The i5-10400F's single-thread score of 688 in 3DMark and its passmark single-thread score of 2541 are respectable, but they are not in the top tier. The data suggests that the CPU is the gatekeeper at 1080p and 1440p, capping the maximum output.

Measured FPS Breakdown

The following table illustrates the exact average FPS recorded for this combo at each resolution and preset.

At 3840x2160, the recorded averages are:

• Low: 109 FPS
• Medium: 87.5 FPS
• High: 74 FPS
• Ultra: 56.8 FPS

At 2560x1440, the recorded averages are:

• Low: 132.6 FPS
• Medium: 114 FPS
• High: 106.1 FPS
• Ultra: 95.9 FPS

At 1920x1080, the recorded averages are:

• Low: 148.4 FPS
• Medium: 127.3 FPS
• High: 120.9 FPS
• Ultra: 107.2 FPS

The pattern is consistent: the absolute frame rates are high, but the scaling with settings is much steeper at 4K. The gap between Low and Ultra at 1080p is 41.2 FPS, while at 4K the same gap is 52.2 FPS. This confirms that the GPU's rendering load scales more steeply with resolution, while the CPU's workload remains relatively constant.

FAQ

Q: Can this system maintain 60 FPS at 4K with Ultra settings?

A: No. The measured average FPS at 3840x2160 Ultra is 56.8 FPS, which falls below the 60 FPS playable threshold. The best playable 4K preset is High, which averages 74 FPS.

Q: What is the maximum playable preset at 2560x1440?

A: The Ultra preset is fully playable at 2560x1440, with an average of 95.9 FPS.

Q: Is the CPU or GPU the limiting factor at 1920x1080?

A: The data indicates the CPU is the primary limit at 1080p. The frame rates are extremely high (over 148 FPS on Low), but the scaling between presets is modest, suggesting the RTX 4090 is waiting on the CPU.

Q: Does the i5-10400F bottleneck the RTX 4090 in Rust?

A: Yes, the data strongly suggests a CPU bottleneck at 1080p and 1440p. The FPS figures are very high, but the GPU is likely capable of more with a faster CPU.

Q: What is the best settings combo for 4K gaming?

A: For a guaranteed 60+ FPS experience, the High preset is the best choice at 3840x2160, as it averages 74 FPS.

Q: What is the absolute highest FPS this combo can achieve?

A: The highest recorded average FPS is 148.4, achieved at 1920x1080 with Low settings.

The Verdict

Yes, this PC can run Rust, and it does so exceptionally well. The verdict by resolution is clear:

• At 3840x2160, the system is playable on High, Medium, and Low presets. The Ultra preset is not playable, as it drops to 56.8 FPS, below the 60 FPS threshold. The best playable setting is High at 74 FPS.
• At 2560x1440, the system is playable on Ultra, High, Medium, and Low presets. The Ultra setting is the best, averaging 95.9 FPS.
• At 1920x1080, the system is playable on all presets, with Ultra being the best at 107.2 FPS.

The story is clear: for a high-refresh-rate 1080p or 1440p monitor, this combo is overkill for Rust, but the CPU limits the maximum potential. For 4K, the RTX 4090 is still strong enough to handle the game at high settings, but the CPU is less of a factor.

How This Combo Ranks

Within the database's history of tested combinations, this specific match-up holds a rank of #761 out of 3723 combos. This places it in the top 20% of all tested systems for this game. The high rank is largely due to the RTX 4090's brute force, but the CPU's 68th percentile score among all CPUs (and its benchmark scores) means it is not a top-end processor. The combo's rank reflects the fact that while the GPU is among the best, the CPU is holding back the overall potential, making this a very fast but not top-tier setup for Rust.

Similar Performance Alternatives

The database's nearest rivals for the CPU and GPU give an idea of what other hardware would behave similarly.

For the Intel Core i5-10400F, the nearest rival by average benchmark score is the Intel Xeon 6756E, which is a very close match (0.2% delta). The AMD EPYC 7552 is also very close, with a delta of 0.5%. On the other side, the Intel Core 7 160UL is slightly faster by 0.3%, and the AMD Ryzen 3 7320C is slightly faster by 0.6%. These differences are negligible in real-world gaming, meaning any of these CPUs would pair with the RTX 4090 in a similar way, likely producing similar frame rates in Rust.

For the NVIDIA GeForce RTX 4090, the nearest rival is the Intel Arc Pro A60, which has a delta of 0%, indicating an almost identical average benchmark score. The AMD Radeon Pro Vega 48 is also very close, only 0.3% slower. The AMD Radeon Pro W6600M is slightly faster by 2.5%, while the AMD Radeon PRO V710 is 2.9% slower. These GPUs, while different in architecture, would produce very similar performance in Rust at the same settings. If a user were looking at a different GPU, these would be the closest substitutes in terms of raw throughput.

The data suggests that swapping the i5-10400F for a Xeon 6756E or a Ryzen 3 7320C would result in nearly identical FPS numbers. Similarly, replacing the RTX 4090 with an Arc Pro A60 would yield the same output. This highlights the tight clustering of benchmark scores in the top tier, where tiny percentage deltas are unlikely to be perceptible. The core takeaway is that this combo's performance is robust, but the CPU is the clear weak link in an otherwise top-tier GPU setup.