Rust

Rust presents an unusually heavy load for this AMD Ryzen 5 8400F + AMD Radeon RX 580 combination. The measured frame rates show a system that is consistently GPU-bound, but the margins between settings presets reveal a graphics card that struggles to maintain playable performance even at 1080p. The data suggests this pairing is best suited for low-to-medium settings at 1080p, with any move toward higher resolutions or quality presets resulting in a rapid collapse in frame rates.

Resolution Scaling

The frame rate drop from 1080p to 4K is steep and consistent across all settings presets, but the pattern reveals important information about where the bottleneck lies. At Low settings, the average FPS falls from 73.7 at 1920x1080 to 54.1 at 2560x1440, then plummets to 31.8 at 3840x2160. This represents a 57% reduction from 1080p to 4K, which is a classic sign of a GPU that is being overwhelmed by pixel count rather than a CPU limitation.

The scaling becomes even more dramatic at higher quality presets. At High settings, the system drops from 44.9 FPS at 1080p to 30.8 FPS at 1440p, and then to 15 FPS at 4K. The 4K result is particularly telling — it is less than half of the 1440p figure, indicating that the RX 580's 256-bit memory bus and 256.0 GB/s bandwidth are simply insufficient for the data demands of Rust's terrain and building systems at that resolution.

The gap between Low and Ultra settings widens as resolution increases. At 1080p, the difference between Low (73.7 FPS) and Ultra (34.9 FPS) is 38.8 FPS. At 4K, that gap shrinks to 17 FPS (31.8 vs 14.8), but both figures are well below playable thresholds. The data shows that at 4K, even the lowest settings cannot maintain 32 FPS average, which strongly suggests the limiting component is the GPU's raw shading throughput (6.175 TFLOPS FP32) rather than any CPU constraint.

How This Combo Ranks

This combination ranks 1567 out of 1717 tested combos in Rust, placing it in the bottom 9% of all systems tested. That ranking is a direct consequence of the GPU's age and architecture. The RX 580 sits at the 53rd percentile among all GPUs, with an average benchmark score of 13559, putting it statistically even with the NVIDIA GeForce GTX 570 (0% delta) and GTX 950 (0.1% delta). The CPU, by contrast, is far more capable — the Ryzen 5 8400F ranks at the 82nd percentile and its average benchmark score of 25064 is nearly identical to that of the AMD Ryzen 7 2700X (0% delta).

The imbalance is stark. The CPU's 6 cores and 12 threads with Zen 4 architecture are more than sufficient for Rust's simulation logic, but the GPU's GCN 4.0 architecture from 2017 cannot translate that processing power into frame rate. The measured data confirms this: the system's ranking in Rust is dragged down almost entirely by the GPU, which is operating near the performance level of a GTX 950 in synthetic tests. For context, the CPU alone would place this system much higher if paired with a modern GPU, but the measured results show a hard ceiling imposed by the graphics card.

GPU Role

The Radeon RX 580's specifications explain why it limits this combo so severely. It has 8 GB of GDDR5 memory on a 256-bit bus, providing 256.0 GB/s of bandwidth — adequate for 1080p in most titles but insufficient for Rust's large, streaming worlds at higher resolutions. The GPU's clock speeds are modest by modern standards: a base of 1257 MHz and a boost of 1340 MHz, with memory running at 2000 MHz (8 Gbps effective).

The measured FPS data shows the GPU becoming the sole limiting factor as resolution increases. At 4K with Low settings, the system manages 31.8 FPS, which is nearly identical to the 1440p High result of 30.8 FPS. This suggests that at 4K Low, the GPU is working at its absolute maximum output, and the CPU is nowhere near a bottleneck. The FP32 throughput of 6.175 TFLOPS is the hard ceiling, and Rust's draw calls and shader work at 4K simply exceed what this Polaris 20 chip can deliver.

The GPU's DirectX 12 support (12_0) is present but old, and its PassMark DirectX 12 score of 43 is low compared to its DirectX 11 score of 60. This indicates the card performs relatively better under legacy APIs, but Rust's modern rendering pipeline does not favor this architecture. The 8 GB VRAM is never the issue — the bottleneck is raw compute and memory bandwidth, not capacity.

Settings Recommendations

The measured data points to a single viable configuration for this combo: 1920x1080 with Low settings, which produces an average of 73.7 FPS. This is the only preset in the entire dataset that exceeds 60 FPS, and it does so by a comfortable margin. The next best option, 1080p Medium at 47 FPS, is playable but leaves little headroom for the frame drops that Rust's dynamic world can cause during base raids or heavy player activity.

At 1440p, no settings preset achieves 60 FPS. Low settings at 1440p yields 54.1 FPS, which is borderline acceptable for a survival game where reaction time matters less than in competitive shooters, but it is not ideal. High settings at 1080p (44.9 FPS) is the best quality-to-performance tradeoff if visual fidelity is prioritized, but the data shows that Medium at 1080p (47 FPS) offers nearly the same frame rate with slightly better visuals.

Ultra settings are not recommended at any resolution. The best Ultra result is 34.9 FPS at 1080p, which is below the 40 FPS threshold that most players consider minimum for smooth gameplay. At 4K, all presets are below 32 FPS, making that resolution unusable for this combo. The data clearly indicates that players should stay at 1080p and choose between Low (73.7 FPS) for competitive smoothness or Medium (47 FPS) for a balance of visuals and responsiveness.

Measured FPS Breakdown

At 1920x1080, the frame rates are as follows: Low averages 73.7 FPS, Medium averages 47 FPS, High averages 44.9 FPS, and Ultra averages 34.9 FPS. The step from Low to Medium is a 26.7 FPS drop, which is the largest single-preset penalty in the dataset, indicating that Medium enables heavy post-processing or shadow effects that tax the RX 580 significantly.

Moving to 2560x1440, the results are: Low at 54.1 FPS, Medium at 32.3 FPS, High at 30.8 FPS, and Ultra at 23.8 FPS. The Medium-to-High gap narrows to just 1.5 FPS, suggesting that at this resolution, the GPU is so saturated that additional settings changes have diminishing impact. The Low preset at 1440p loses 19.6 FPS compared to 1080p Low, which is a 27% reduction — a clear indicator of pixel-count scaling.

At 3840x2160, the results are: Low at 31.8 FPS, Medium at 21.1 FPS, High at 15 FPS, and Ultra at 14.8 FPS. The difference between High and Ultra at 4K is only 0.2 FPS, meaning the GPU has hit its absolute compute limit and further quality settings changes produce no measurable improvement. The 4K Low result of 31.8 FPS is identical to the 1440p High result of 30.8 FPS within a margin of error, confirming that the GPU is the sole performance determiner at these resolutions.

FAQ

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

A: The only configuration that exceeds 60 FPS is 1920x1080 with Low settings, which averages 73.7 FPS. For better visuals, 1080p Medium at 47 FPS is the next best option, while 1440p Low at 54.1 FPS is the only viable choice at that resolution.

Q: Can this system run Rust at 4K?

A: No. At 3840x2160, even Low settings only produce 31.8 FPS, and Ultra drops to 14.8 FPS. These results are below playable thresholds for a survival game that requires quick reactions to environmental threats.

Q: How does the CPU performance compare to the GPU in this combo?

A: The Ryzen 5 8400F ranks at the 82nd percentile among all CPUs with an average benchmark score of 25064, while the RX 580 ranks at the 53rd percentile with an average score of 13559. The CPU is not the limiting factor; the GPU is.

Q: What is the frame rate difference between Low and Ultra at 1080p?

A: At 1920x1080, Low averages 73.7 FPS while Ultra averages 34.9 FPS, a difference of 38.8 FPS. This gap narrows to 17 FPS at 4K (31.8 vs 14.8), showing that the GPU becomes the bottleneck regardless of settings at higher resolutions.

Q: Is 8 GB of VRAM sufficient for Rust at high settings?

A: The 8 GB VRAM is not the issue. The bottleneck is the GPU's compute throughput (6.175 TFLOPS FP32) and memory bandwidth (256.0 GB/s). At 4K with High settings, the system only achieves 15 FPS, which is a compute limitation, not a memory capacity problem.

Q: How does this combo rank compared to all tested systems in Rust?

A: This combination ranks 1567 out of 1717 tested combos, placing it in the bottom 9%. The GPU's synthetic benchmark scores are statistically tied with the NVIDIA GeForce GTX 570 and GTX 950, which explains the poor ranking.