Rust

The Intel Core i5-9400 paired with the NVIDIA GeForce RTX 5080 produces a wide spread of results in Rust, depending entirely on the resolution and quality preset selected. The database shows this combination is capable of high frame rates at 1080p and 1440p, but it begins to strain at 4K with the most demanding settings. The recorded data provides a clear picture of how this CPU and GPU interact across the three standard resolutions and four quality presets.

Measured FPS Breakdown

At 1920x1080, the system delivers its highest frame rates. With Low settings, the average FPS is 142. Moving to Medium settings, the average drops to 122 FPS, with recorded minimum and maximum values of 104 and 140 FPS respectively. High settings yield an average of 115 FPS. The most demanding preset at this resolution, Ultra, still produces a solid average of 104 FPS. The data shows a clear trend: even the heaviest load at 1080p keeps the average well above the 60 FPS playability threshold.

At 2560x1440, the frame rates remain strong but show a more pronounced drop from the 1080p results. Low settings average 125 FPS. Medium settings average 108 FPS, with a recorded minimum of 92 and a maximum of 124 FPS. High settings produce an average of 101 FPS. Ultra settings at 1440p average 88 FPS. The step from Low to Ultra at this resolution represents a 37 FPS difference, indicating that the GPU is still the primary driver of performance, but the CPU is beginning to show its limits at the higher preset.

At 3840x2160, the performance gap becomes significant. Low settings average 105 FPS, which is still very playable. Medium settings average 81 FPS, with a minimum of 69 and a maximum of 94 FPS. High settings drop to an average of 69 FPS. Ultra settings fall below the playable threshold, averaging just 52 FPS. The scaling from Low to Ultra at 4K shows a reduction of 53 FPS, the largest drop in the entire dataset, which indicates that the GPU is being pushed to its absolute limits at this resolution.

CPU and GPU Roles

The data reveals a shifting balance between the CPU and GPU as resolution changes. At 1080p, the differences between presets are relatively small. The spread from Low to Ultra is only 38 FPS (from 142 to 104). This suggests that at lower resolutions, the CPU is more involved in determining the final frame rate. The Intel Core i5-9400 has six cores and six threads, a configuration that can bottleneck the RTX 5080 at lower resolutions where the GPU can produce frames faster than the CPU can issue them.

At 1440p, the spread between presets widens to 37 FPS (from 125 to 88), but the absolute values remain high. The scaling from 1080p to 1440p at Ultra settings is a drop from 104 to 88 FPS, which is a 15% reduction. This indicates that the GPU is starting to become the primary factor, but the CPU still holds relevance. The i5-9400, with its boost clock of 4.10 GHz, is likely keeping the frame rate from reaching even higher numbers at this resolution.

At 4K, the GPU becomes the dominant component. The scaling from 1440p to 2160p at Ultra settings is drastic, from 88 to 52 FPS, a 41% reduction. This confirms that the RTX 5080 is fully saturated at this resolution and preset. The CPU role diminishes, as the bottleneck shifts entirely to the graphics card's ability to process the 8.3 million pixels. The i5-9400 is still fast enough to feed the GPU at 4K, but it can no longer compensate for the GPU's workload.

Best Settings per Resolution

For 1920x1080, the most demanding preset that stays at or above 60 FPS is Ultra, with an average FPS of 104. This is the best visual quality available, and the system has enough headroom to maintain smooth gameplay. The data confirms that all four presets at 1080p clear the 60 FPS threshold.

At 2560x1440, the highest playable setting is also Ultra, averaging 88 FPS. This is a strong result, showing the system can handle the highest quality at this resolution without dropping below the playability threshold. The 60 FPS threshold is cleared by a margin of 28 FPS.

At 3840x2160, the most demanding preset that stays at or above 60 FPS is High, with an average of 69 FPS. Medium settings average 81 FPS, and Low settings average 105 FPS, but High is the highest setting that meets the target. Ultra settings fall below the threshold at 52 FPS, so they are not recommended for 4K play.

FAQ

Q: Can this system run Rust at 4K with Ultra settings?

A: No. At 3840x2160 with Ultra settings, the average FPS is 52, which is below the 60 FPS playability threshold.

Q: What is the best setting for 1440p to stay above 60 FPS?

A: Ultra settings at 2560x1440 yield an average FPS of 88, making it the best playable preset for that resolution.

Q: What is the performance difference between Low and Ultra settings at 1080p?

A: The average FPS drops from 142 at Low to 104 at Ultra, a difference of 38 FPS.

Q: Does this system perform better at 1080p or 1440p?

A: 1080p. The average FPS is higher at 1920x1080 across all settings, with Ultra averaging 104 FPS at 1080p compared to 88 FPS at 1440p.

Q: Is the RTX 5080 the main limiting factor at 4K?

A: Yes. The 41% reduction in FPS from 1440p Ultra to 4K Ultra (88 to 52 FPS) indicates the GPU is the primary constraint at 4K.

Q: At what resolution does the i5-9400 become a bottleneck?

A: The data indicates the CPU is more involved at 1080p, where the frame rate differences between presets are smaller. At 1440p and 4K, the GPU becomes the dominant factor.

The Verdict

The data clearly indicates that this PC can run Rust. At 1920x1080, the system clears 60 FPS on all four presets, with the best setting being Ultra at an average of 104 FPS. At 2560x1440, the system also clears 60 FPS on all presets, with the best setting being Ultra at 88 FPS. At 3840x2160, the system is playable on Low, Medium, and High settings, but not Ultra. The best playable setting at 4K is High, with an average FPS of 69. The verdict by resolution confirms that 1080p and 1440p are fully playable, while 4K is playable up to High settings.

How This Combo Ranks

In the database of tested combinations, this specific CPU and GPU pairing holds a rank of 982 out of 3723 combos. This places it in the upper-middle range of all tested systems for this game. It is a very high ranking, indicating that the overall performance is strong, even though the CPU is an older model. The combination's performance is heavily influenced by the GPU's power, which is in the 87th percentile of all GPUs, but the CPU is only in the 47th percentile of all CPUs. This is a lopsided pairing, and the rank reflects that.

Similar Performance Alternatives

Looking at the nearest rivals for the CPU, the Intel Core i5-9400 is closely matched by the Intel Core i7-1068NG7, which scores 0.2% lower in average synthetic benchmarks. The Intel Core i5-9400 scores 0.3% higher than the Intel Core i7-10710U. The AMD Ryzen 5 PRO 1500 is also very close, with the i5-9400 scoring 0.4% higher. The i5-9400 is 0.4% lower than the Intel Core i3-10305. These small differences indicate that swapping the i5-9400 for any of these CPUs would result in nearly identical performance in Rust, as the game relies more on the GPU at higher resolutions.

For the GPU, the NVIDIA GeForce RTX 5080 is very closely matched with the AMD Radeon RX 6750 GRE. The 5080 scores 0.6% lower than the AMD Radeon RX 9070 GRE, and 0.7% lower than the AMD Radeon RX 6750 GRE. It scores 2.3% lower than the AMD Radeon Pro W5700X, but 2.2% higher than the AMD Radeon RX 6900 XT. The data shows that swapping the RTX 5080 for any of these rival GPUs would produce a very similar results in Rust, with the frame rates being within a few percent of each other. These users with these alternative GPUs should expect a similar experience in this game.