Rust

The AMD Ryzen 5 8400F paired with the NVIDIA GeForce RTX 4070 delivers a solid Rust experience across all common resolutions, but the data reveals a clear pattern: this combo favors high-refresh 1080p and 1440p gaming, while 4K demands compromises. Benchmark results show the system ranks in the 88th percentile of tested combos for this title, placing it at rank 888 out of 3723 configurations. The measured FPS numbers tell a story of a GPU that can push serious frame rates when the CPU keeps up, and a processor that has enough headroom to feed the RTX 4070 at lower resolutions. Here is the breakdown.

Resolution Scaling

The FPS drop from 1080p to 4K is steep but predictable, and it clearly identifies the RTX 4070 as the primary limiter at high pixel counts. At Low settings, the average frame rate falls from 216 FPS at 1920x1080 to 155 FPS at 2560x1440, a reduction of 61 FPS. Pushing further to 3840x2160 drops the average to 91 FPS, which is 125 FPS below the 1080p result. That represents a 58% reduction from 1080p to 4K at Low settings. The pattern holds for High settings: 127 FPS at 1080p, 88 FPS at 1440p, and 52 FPS at 4K. Again, the 4K figure is roughly 59% lower than the 1080p number.

This scaling behavior indicates that the GPU is the bottleneck at 4K, because the CPU’s performance does not degrade with resolution—it simply feeds frames as fast as the renderer can produce them. The fact that the 1440p Low result of 155 FPS is still very high suggests the Ryzen 5 8400F can push well beyond what most displays show, but the RTX 4070 cannot sustain that throughput when pixel count quadruples. At 4K Ultra, the average drops to 39 FPS, which is a playable but not smooth experience for a survival game where quick reactions matter. The gap between Low and Ultra at each resolution also widens as resolution increases: at 1080p, Ultra is 119 FPS lower than Low; at 1440p, the gap is 88 FPS; at 4K, it is 52 FPS. This confirms that the GPU’s shading and memory bandwidth are the limiting factors at higher settings and resolutions, while the CPU’s 6 cores and 12 threads are not the constraint in this scenario.

FAQ

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

A: The data shows 2560x1440 as the sweet spot. At High settings, it delivers 88 FPS average, while Low pushes 155 FPS. This is high enough for smooth gameplay without the massive performance hit seen at 4K, where even Low only reaches 91 FPS.

Q: How does Ultra settings perform compared to High?

A: The difference is significant across all resolutions. At 1080p, Ultra averages 97 FPS versus 127 FPS on High. At 1440p, the gap is 67 FPS versus 88 FPS. At 4K, Ultra drops to 39 FPS compared to 52 FPS on High. The cost of Ultra is roughly 25-30% performance loss at every resolution.

Q: Is the RTX 4070’s 12 GB VRAM enough for Rust?

A: The measured results indicate yes, since the game runs at all tested settings and resolutions without reported issues. The 12 GB of GDDR6X memory and 504.2 GB/s bandwidth are sufficient for Rust’s asset streaming, as evidenced by the playable 4K Medium average of 61 FPS. There is no data suggesting VRAM limitations in this benchmark set.

Q: Does the CPU bottleneck the GPU at 1080p?

A: Not in a way that hurts the experience. At 1080p Low, the combo hits 216 FPS average, which is far beyond typical monitor refresh rates. The Ryzen 5 8400F’s 6 cores and 12 threads with a boost clock of 4.70 GHz are enough to keep the RTX 4070 busy, though the GPU still shows a clear performance ceiling as settings increase.

Q: What is the worst-performing setting for this system?

A: 4K Ultra is the lowest average at 39 FPS. This is below the 60 FPS target most players prefer, and it represents a 52 FPS drop from the 4K Low result. For a game like Rust, where PvP combat requires responsiveness, this setting is not recommended.

Q: How does this combo rank against other tested systems?

A: It sits at rank 888 out of 3723 combinations, placing it in the top 24% of tested configs for Rust. The CPU’s average benchmark score of 25005 places it at the 77th percentile among all CPUs, while the GPU’s average score of 37648 puts it at the 81st percentile among all GPUs.

GPU Role

The NVIDIA GeForce RTX 4070 is the dominant component in this pairing, and its characteristics directly explain the measured FPS numbers. The GPU features 5888 shading units, 184 texture mapping units, and 64 ROPs, with a boost clock of 2475 MHz. Its 12 GB of GDDR6X memory on a 192-bit bus provides 504.2 GB/s of bandwidth, which is crucial for a game like Rust that loads large map textures and dynamic environmental assets. The pixel rate of 158.4 GPixel/s and texture rate of 455.4 GTexel/s are the raw throughput figures that determine how fast the card can fill frames at high resolutions.

In Rust, the RTX 4070’s performance scales predictably with settings. The 3DMark Steel Nomad DX12 score of 3854 and PassMark G3D score of 26927 both place the card above most rivals, and the measured FPS confirms this. At 1440p Medium, the card averages 104 FPS with a minimum of 88 FPS and maximum of 120 FPS, showing consistent frame delivery. The 4K Medium result of 61 FPS average (with 52 min and 71 max) indicates the card can handle 4K when settings are moderated. The FP32 compute of 29.15 TFLOPS is ample for Rust’s physics and rendering, and the 46 RT cores, while not directly tested in this benchmark, indicate the architecture is modern enough for future updates.

The memory subsystem is worth noting. The 504.2 GB/s bandwidth at 21 Gbps effective speed is a significant factor at 4K, where the GPU must fetch and write larger textures. The difference between 4K Low (91 FPS) and 4K High (52 FPS) is a 39 FPS drop, which is steeper than the 1080p drop of 89 FPS between Low and High (216 to 127). This widening gap at higher resolution is a classic sign of the memory bandwidth and shading units being pushed harder, rather than a CPU limitation. The RTX 4070’s end-of-life production status does not affect current performance, as the data reflects measured results.

Settings Recommendations

For the best balance of visual quality and frame rate, High settings at 2560x1440 is the recommended configuration. The 88 FPS average is smooth for most players, and the game still looks detailed. If you prioritize frame rate over visuals, Low settings at 1440p gives 155 FPS, which is excellent for competitive play. At 1080p, High settings at 127 FPS is ideal for high-refresh monitors, while Low at 216 FPS is overkill for most displays but shows the system’s ceiling.

Avoid Ultra settings unless you have a 1080p monitor with a 100 Hz refresh rate or lower. At 1080p Ultra, the average is 97 FPS, which is acceptable, but the drop to 67 FPS at 1440p Ultra makes it a poor choice for that resolution. At 4K, only Low (91 FPS) and Medium (61 FPS) are playable. High at 4K drops to 52 FPS, and Ultra falls to 39 FPS, both below the threshold for a responsive survival experience. The Medium preset offers a good compromise at 4K: 61 FPS average with a minimum of 52 FPS, which is playable if you are not in intense firefights.

The data shows that the jump from Medium to High costs roughly 20-25% performance at every resolution (151 to 127 at 1080p, 104 to 88 at 1440p, 61 to 52 at 4K). The jump from High to Ultra costs another 25-30% (127 to 97 at 1080p, 88 to 67 at 1440p, 52 to 39 at 4K). Therefore, High is the most efficient preset for this hardware, delivering the largest visual improvement per frame lost.

Measured FPS Breakdown

At 1920x1080, the system delivers its strongest numbers. Low settings average 216 FPS, which is the highest result in the entire dataset. Medium averages 151 FPS with a minimum of 128 and maximum of 174, showing good frame pacing. High averages 127 FPS, still very smooth. Ultra averages 97 FPS, which is playable but the lowest of the four presets. The range from Low to Ultra spans 119 FPS, indicating the GPU has significant headroom at this resolution.

At 2560x1440, the performance remains strong but drops notably. Low averages 155 FPS, a 61 FPS reduction from 1080p. Medium averages 104 FPS with a minimum of 88 and maximum of 120, which is a solid experience for 1440p gamers. High averages 88 FPS, and Ultra falls to 67 FPS. The gap between Low and Ultra is 88 FPS, showing the same pattern as 1080p but with lower absolute numbers. The 1440p High result of 88 FPS is the best combination of quality and speed for this resolution.

At 3840x2160, the RTX 4070 is clearly the limiting factor. Low averages 91 FPS, which is the only 4K preset above 60 FPS. Medium averages 61 FPS with a minimum of 52 and maximum of 71, making it the marginal choice for 4K. High drops to 52 FPS, and Ultra falls to 39 FPS. The step from Medium to High at 4K costs 9 FPS, while the step from High to Ultra costs 13 FPS, showing diminishing returns at the top end. The 4K Ultra result of 39 FPS is the worst measured outcome in the entire test suite, and it is the only preset below 40 FPS.

CPU Role

The AMD Ryzen 5 8400F plays a supporting but essential role in this configuration. With 6 cores and 12 threads based on the Zen 4 architecture (Phoenix codename), this CPU has a base clock of 4.20 GHz and a boost clock of 4.70 GHz. Its 16 MB of shared L3 cache and 1 MB L2 per core are modest by modern standards, but the data suggests they are sufficient for Rust. The CPU’s average benchmark score of 25005 places it at the 77th percentile among all CPUs, and its nearest rival is the AMD Ryzen 5 7500F, which scores 24964 with a delta of 0.2%. This means the 8400F is effectively tied with its closest competitor.

In Rust, the CPU’s role is to handle game logic, entity updates, and the server-side simulation that drives the survival mechanics. The 3DMark multi-threaded scores show strong scaling: 6091 at 16 threads, 5275 at 8 threads, and 6165 at max threads. The Cinebench R23 multicore score of 20851 and single-core score of 2943 indicate that this processor has both the multi-threaded throughput and single-thread speed needed for a game that is often CPU-bound in complex bases or large player counts. The PassMark single-thread score of 3685 is particularly relevant, as Rust’s main thread often becomes a bottleneck in busy areas.

The fact that the 1080p Low average is 216 FPS proves the CPU is not holding back the GPU at lower resolutions. If the CPU were the limiter, we would see similar FPS numbers across different resolutions at Low settings, but instead we see 216 FPS at 1080p, 155 FPS at 1440p, and 91 FPS at 4K. This scaling confirms the GPU is the bottleneck everywhere except possibly the very lowest resolution and settings. The CPU’s 65 W TDP and 4 nm process node mean it runs efficiently, but that is not a performance metric.

The CPU’s 16 MB L3 cache is the only potential concern, as Rust can have large working sets. However, the measured results show no evidence of cache-related stuttering, as the minimum FPS values (128 at 1080p Medium, 88 at 1440p Medium, 52 at 4K Medium) are all within reasonable range of the averages. The 12 threads are also sufficient, as Rust generally scales well up to 8 threads, and the 8400F’s 6 cores deliver solid performance in the Cinebench R20 multicore score of 8757. Overall, the CPU provides ample headroom for the RTX 4070, and the pairing is well-balanced for Rust.