Rust

The AMD Ryzen 5 8400F paired with the NVIDIA GeForce RTX 3080 creates a balanced 1440p and high-refresh 1080p system for Rust, though the data indicates that the CPU becomes a limiting factor at lower resolutions while the GPU takes over at 4K. The measured frame rates show a clear story: this combo is highly capable for competitive play at 1080p, solid for high-refresh 1440p, and playable but not ideal at 4K Ultra settings.

Resolution Scaling

The performance drop from 1080p to 4K is substantial across all settings presets, revealing how the workload shifts between components. At Low settings, the average frame rate falls from 216 FPS at 1080p to 148 FPS at 1440p, then to 88 FPS at 4K. That represents a 31% reduction from 1080p to 1440p and another 41% drop when moving to 4K. This steep decline at 4K strongly indicates that the RTX 3080's rendering pipeline is the primary bottleneck at that resolution, as the pixel count quadruples while the CPU workload remains relatively constant.

The Medium settings preset tells a similar story with slightly different numbers. The average FPS goes from 145 at 1080p down to 100 at 1440p and then 59 at 4K. The min FPS at 1080p Medium is 123 FPS, which is still higher than the average at 4K Medium (59 FPS), highlighting how resolution scaling impacts the overall experience. The High preset shows 122 FPS at 1080p, 84 FPS at 1440p, and just 50 FPS at 4K — a 59% drop from 1080p to 4K, which is the largest relative decline among the presets with data.

Ultra settings follow the same trend but start from a lower baseline. The average FPS at 1080p Ultra is 93, dropping to 64 at 1440p and 38 at 4K. The scaling from 1080p to 1440p is a 31% reduction, while the move to 4K costs another 41%. These scaling patterns suggest that the CPU is not the limiting factor at 4K; instead, the GPU's raw pixel throughput determines the final numbers. At 1080p Low, the 216 FPS average is likely near the CPU's maximum frame generation capability for this game, given that the Ryzen 5 8400F has a 77th percentile ranking among all CPUs.

CPU Role

The AMD Ryzen 5 8400F is a 6-core, 12-thread processor based on the Zen 4 architecture, built on a 4 nm process. Its base clock is 4.20 GHz with a boost clock of 4.70 GHz, and it has a 65 W TDP. The CPU's benchmark scores provide context for its gaming performance: it achieves a 3DMark single-thread score of 951 and a max-thread score of 6165, with Cinebench R23 results of 2943 single-core and 20851 multi-core. The PassMark multithread score is 24389, and the single-thread score is 3685.

In Rust, which is known for its CPU-intensive simulation and entity rendering, the 8400F's performance at 1080p Low settings (216 FPS average) suggests that the processor can feed the RTX 3080 effectively at lower resolutions. However, the data shows that this CPU is not the primary constraint at 4K, where the GPU's workload dominates. The CPU's percentile ranking of 77 means it outperforms most processors on the market, and its nearest rivals in average benchmark score include the AMD Ryzen 5 7500F (deltaPct 0.2) and the Intel Core i7-11850H (deltaPct 0.3), both of which are within a fraction of a percent of the 8400F's performance.

The 16 MB of shared L3 cache and dual-channel DDR5 memory support at 83.2 GB/s bandwidth contribute to the CPU's ability to handle Rust's demanding world simulation. The 4 nm process and 25,000 million transistors on a 178 mm² die indicate an efficient design, but the data does not show any thermal throttling issues in the measured FPS numbers. The fact that the 1080p Low preset hits 216 FPS while the 1080p Ultra preset only reaches 93 FPS suggests that the CPU can sustain high frame rates when the GPU is not overloaded, but the GPU becomes the bottleneck as settings increase.

FAQ

Q: Can this combo handle Rust at 4K resolution?

A: Yes, but with compromises. The data shows average FPS of 50 at High settings and 59 at Medium settings, while Ultra settings drop to 38 FPS. The Low preset achieves 88 FPS at 4K, making it the only 4K preset that consistently exceeds 60 FPS.

Q: What is the best resolution for competitive play with this hardware?

A: The 1080p Low preset delivers a 216 FPS average, which is ideal for high-refresh monitors. The 1440p Low preset also performs well at 148 FPS, offering a balance between visual quality and frame rate for most players.

Q: How does the Ryzen 5 8400F compare to its closest rivals?

A: The Ryzen 5 8400F has an average benchmark score of 25005, which is 0.2% higher than the AMD Ryzen 5 7500F (24964) and 0.3% higher than the Intel Core i7-11850H (24935). It trails the AMD EPYC 9474F by 0.4%, but the difference is negligible for gaming.

Q: Is the RTX 3080's 10 GB VRAM sufficient for Rust at high settings?

A: The measured data shows playable frame rates at 4K High (50 FPS) and 1440p Ultra (64 FPS), indicating that the 10 GB GDDR6X memory is not causing a hard bottleneck in these scenarios. The GPU's 760.3 GB/s bandwidth helps maintain performance.

Q: What settings preset provides the smoothest experience at 1440p?

A: The Medium preset at 1440p averages 100 FPS with a minimum of 85 FPS and maximum of 115 FPS, providing a consistent experience. The High preset at 84 FPS is also viable, but the Medium preset offers better frame time consistency.

Q: Does the CPU limit performance at 1080p?

A: The data suggests the CPU is near its limit at 1080p Low (216 FPS), but the GPU still scales with settings. The 1080p Ultra preset drops to 93 FPS, indicating that the GPU workload increases significantly with higher settings, while the CPU can maintain high frame rates.

Measured FPS Breakdown

At 1920x1080, the Low preset delivers the highest average frame rate at 216 FPS, making it the best choice for maximum responsiveness. The Medium preset averages 145 FPS with a minimum of 123 FPS and maximum of 166 FPS, providing a solid middle ground for players who want better visuals without sacrificing too much speed. High settings average 122 FPS, which is still excellent for most displays, while Ultra drops to 93 FPS. The scaling from Low to Ultra at 1080p shows a 57% reduction in average FPS, emphasizing the GPU's role in rendering quality.

At 2560x1440, the Low preset maintains a high average of 148 FPS, which is competitive for many esports scenarios. Medium averages 100 FPS with a min-max range of 85 to 115 FPS, offering consistent performance for standard gaming. High settings average 84 FPS, which is smooth on most monitors, while Ultra drops to 64 FPS. The 1440p Ultra result is notable because it remains above 60 FPS, making it a viable option for players who prioritize visual fidelity.

At 3840x2160, the frame rates decrease significantly across all presets. Low averages 88 FPS, which is the only 4K preset that stays comfortably above 60 FPS. Medium averages 59 FPS with a minimum of 50 FPS and maximum of 68 FPS, meaning the experience will dip below 60 FPS at times. High averages 50 FPS, which is playable but not ideal for fast-paced action. Ultra averages 38 FPS, making it the most demanding option and likely too slow for comfortable gameplay. The 4K results clearly show that the RTX 3080 is the limiting component at this resolution, as the CPU's performance is sufficient to push higher frame rates at lower resolutions.

GPU Role

The NVIDIA GeForce RTX 3080 is a high-end graphics card based on the Ampere architecture, built on an 8 nm process at Samsung. It features 8704 shading units, 272 texture mapping units, and 96 render output units, along with 68 ray tracing cores and 272 tensor cores. The GPU has a base clock of 1440 MHz and a boost clock of 1710 MHz, with 10 GB of GDDR6X memory running at 19 Gbps effective on a 320-bit bus, providing 760.3 GB/s of memory bandwidth. The card's FP32 performance is 29.77 TFLOPS, and it supports DirectX 12 Ultimate, Vulkan 1.4, and OpenGL 4.6.

In Rust, the RTX 3080's role is most evident at 4K resolution, where the average FPS drops to 38 at Ultra settings. The GPU's benchmark scores show a PassMark G3D score of 25086 and a 3DMark Steel Nomad DX12 score of 4407, placing it in the 68th percentile among all GPUs. Its nearest rivals in average benchmark score are the NVIDIA P106-100 (deltaPct -0.3), AMD Radeon Pro Vega 16 (deltaPct -0.3), and AMD Radeon RX 6600M (deltaPct -0.4), all of which are slightly lower in performance.

The GPU's 10 GB memory capacity is adequate for Rust's textures and geometry at the measured settings, as evidenced by the playable frame rates at 4K High (50 FPS) and 1440p Ultra (64 FPS). The card's high memory bandwidth of 760.3 GB/s helps maintain performance when loading large textures and rendering distant terrain. The RTX 3080's dual-slot design and 320 W TDP require a robust power supply, with NVIDIA recommending a 700 W PSU, but the data does not indicate any performance degradation from power or thermal limits during the benchmark runs.

Settings Recommendations

For players targeting the highest possible frame rates, the 1080p Low preset is the clear choice, delivering 216 FPS on average. This setting is ideal for competitive play where responsiveness matters more than visual polish. At 1440p, the Low preset still offers 148 FPS, making it a strong option for high-refresh 1440p monitors, though the Medium preset at 100 FPS provides a better balance between image quality and speed.

The Medium presets across all resolutions show the best compromise for most players. At 1080p, Medium averages 145 FPS with a minimum of 123 FPS, ensuring smooth gameplay even in demanding scenes. At 1440p, Medium averages 100 FPS with a min-max range of 85 to 115 FPS, which is consistent enough for most gaming scenarios. At 4K, Medium averages 59 FPS with dips to 50 FPS, so players who prefer 4K should be prepared for occasional frame rate drops below 60.

The High preset is recommended for players with 1440p monitors who want better visuals without sacrificing too much performance. The 84 FPS average at 1440p High is smooth, while the 1080p High at 122 FPS is also excellent. At 4K, High drops to 50 FPS, which is borderline playable but not ideal for fast action. The Ultra preset is only recommended for 1080p (93 FPS) or 1440p (64 FPS) gaming, as the 4K Ultra result of 38 FPS is too slow for comfortable play. Overall, the data suggests that Medium settings at 1440p provide the best overall experience for this hardware combination, balancing visual fidelity, frame rate, and consistency.