Rust

The AMD Ryzen 5 8400F paired with the NVIDIA GeForce RTX 4080 produces a wide performance envelope in Rust, but the data indicates that the GPU becomes the primary constraint as resolution climbs. At 1920x1080, the combo delivers 216 FPS on Low settings, yet this drops to 117 FPS at 3840x2160 on the same preset. This 99 FPS reduction represents roughly a 45% decrease in average frame rate, a steep curve that points to the graphics card's workload scaling with pixel count. The RTX 4080's 16 GB of GDDR6X memory and 716.8 GB/s bandwidth are more than sufficient for the game's textures, so the FPS loss is tied to raw shader output rather than memory pressure. The data suggests that at 1080p, the Ryzen 5 8400F can feed frames at a rate that rivals the GPU's output, but at 4K, the rendering pipeline becomes the limiting factor.

Resolution Scaling

The measured FPS rows reveal a consistent pattern across all four settings presets: as resolution increases from 1920x1080 to 3840x2160, average frame rates fall by 45-50%. For the High preset, the drop is from 163 FPS at 1080p to 112 FPS at 1440p, then further to 66 FPS at 4K. The Low preset shows the largest absolute decline, moving from 216 FPS at 1080p to 191 FPS at 1440p and finally 117 FPS at 4K. This scaling behavior is characteristic of a GPU-bound scenario at higher resolutions, where the RTX 4080's 48.74 TFLOPS FP32 compute capacity is taxed by the increasing number of fragments to shade. The Ultra preset tells a similar story, with 124 FPS at 1080p falling to 85 FPS at 1440p and 50 FPS at 4K.

The fact that the gap between Low and Ultra narrows at higher resolutions further reinforces the GPU-limited interpretation. At 1080p, the difference between Low and Ultra is 92 FPS (216 vs 124), but at 4K, this gap shrinks to 67 FPS (117 vs 50). When the GPU is fully saturated at 4K, the settings overhead becomes relatively smaller because the pixel throughput dominates the frame time. Conversely, at 1080p, the CPU has more headroom to push higher frame rates, but the RTX 4080 still manages to render every frame, suggesting that even at lower resolutions, the combination is not entirely CPU-bound. The 3DMark Steel Nomad DX12 score of 6567 for the GPU reinforces that the card's raw performance is high, yet the 4K Ultra figure of 50 FPS indicates that Rust's Ultra preset includes effects that heavily tax even this level of hardware.

CPU Role

The Ryzen 5 8400F is a 6-core, 12-thread processor based on the Zen 4 architecture, running at a base clock of 4.20 GHz and a boost clock of 4.70 GHz. Its benchmark results show a Cinebench R23 multicore score of 20851 and a single-core score of 2943. In Rust, which is known for its server-side simulation and player-driven world persistence, the CPU's single-thread performance often matters more than raw core count. The 3DMark single-thread score of 951 and the 2-thread score of 1874 suggest that the processor has strong per-core capabilities, which aligns with the FPS figures at 1080p. At 1920x1080 Low, the combo hits 216 FPS, which is close to the practical ceiling for many displays, indicating that the 8400F can keep up with the RTX 4080's frame output at lower resolutions. However, the data does not show a scenario where the CPU becomes the bottleneck, as even at 1080p Ultra (124 FPS), the GPU is still likely the limiting factor given the 50 FPS at 4K Ultra.

The CPU's 16 MB of shared L3 cache and 83.2 GB/s memory bandwidth are moderate figures, but they do not appear to hinder Rust's performance in the measured rows. The processor's percentile ranking of 77 versus all CPUs places it above average, and its nearest rival, the AMD Ryzen 5 7500F, has an average benchmark score that is only 0.2% higher (24964 vs 25005). This close margin suggests that the 8400F's 6-core configuration is well-balanced for gaming workloads. The fact that the combo achieves 186 FPS at 1080p Medium and 163 FPS at 1080p High shows that the CPU can handle the game's logic and physics without causing frame rate drops, even when the GPU is producing high frame rates.

How This Combo Ranks

Within the benchmark database, this specific combination of AMD Ryzen 5 8400F and NVIDIA GeForce RTX 4080 ranks 275th out of 3723 tested combos in Rust. This places it in the top 7.4% of all configurations, which is a strong showing given that the CPU is a mid-range part and the GPU is a high-end one. The rank reflects that the pairing achieves playable frame rates across all resolution and settings combinations, with no measured row falling below 50 FPS. The percentileVsAllGpus figure of 86 for the RTX 4080 confirms that the GPU is in the upper echelon, while the CPU's percentile of 77 is slightly lower, meaning the processor is relatively weaker compared to its GPU partner. This mismatch does not hurt the combo's ranking in Rust, as the game's demands are balanced enough that neither component becomes a severe liability.

The nearest rivals for the CPU include the AMD Ryzen 5 7500F with a deltaPct of 0.2%, the Intel Core i7-11850H at 0.3%, and the Intel Core i7-13620H at 0.4%. These differences are negligible, meaning that swapping the 8400F for any of these processors would yield near-identical performance in Rust. The RTX 4080's closest rival, the RTX 4080 SUPER, has a deltaPct of 0.1%, so the GPU is essentially tied with its immediate successor. The combo rank of 275 benefits from the GPU's strong benchmark scores, particularly the Passmark G3D score of 34457, which is well above average. When compared to combos with weaker GPUs, this pairing's advantage lies in its ability to maintain high frame rates at 1440p and 4K, where the RTX 4080's 16 GB of VRAM and 256-bit memory bus provide ample headroom.

Measured FPS Breakdown

At 1920x1080, the combo delivers a full range of results across the four presets. The Low preset produces an average of 216 FPS, which is the highest measured score in the entire dataset. The Medium preset yields 186 FPS with a minimum of 158 FPS and a maximum of 214 FPS, showing a stable frame time distribution. The High preset averages 163 FPS, while the Ultra preset drops to 124 FPS. These numbers indicate that at 1080p, the RTX 4080 is not fully saturated, as the frame rates scale significantly with settings changes. The gap from Low to Ultra is 92 FPS, which is the largest absolute difference at any resolution, suggesting that the GPU has spare capacity at this resolution.

Moving to 2560x1440, the frame rates remain high but show a clear step down. The Low preset averages 191 FPS, which is only 25 FPS lower than at 1080p, indicating that the GPU can still handle the increased pixel count with ease. The Medium preset averages 133 FPS with a minimum of 113 FPS and a maximum of 153 FPS, while the High preset averages 112 FPS. The Ultra preset falls to 85 FPS. The scaling from 1080p to 1440p is roughly 11-12% for Low, but the Ultra preset sees a larger drop of 31% (124 to 85 FPS), showing that the heavier settings amplify the resolution penalty. At 3840x2160, the data shows the most significant impact. The Low preset averages 117 FPS, the Medium preset averages 79 FPS with a minimum of 67 FPS and a maximum of 90 FPS, the High preset averages 66 FPS, and the Ultra preset averages 50 FPS. The 4K Low figure of 117 FPS is still playable, but the Ultra figure of 50 FPS sits at the edge of acceptable smoothness for fast-paced gameplay. The Medium preset's minimum of 67 FPS indicates that even at 4K, frame dips stay above 60 FPS, which is a positive sign for consistency.

FAQ

Q: What is the highest average FPS this combo achieves in Rust?

A: The highest measured average FPS is 216, achieved at 1920x1080 resolution with the Low settings preset.

Q: How does the combo perform at 4K Ultra settings?

A: At 3840x2160 Ultra, the average FPS is 50, which is the lowest measured value across all tested configurations.

Q: Is the frame rate consistent at 1440p Medium?

A: At 2560x1440 Medium, the average FPS is 133, with a minimum of 113 FPS and a maximum of 153 FPS, indicating a stable range with a 40 FPS spread.

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

A: At 1920x1080, the Low preset averages 216 FPS while the Ultra preset averages 124 FPS, a difference of 92 FPS.

Q: Does the combo maintain 60+ FPS at 4K on any preset?

A: Yes, at 3840x2160, the Low preset averages 117 FPS and the Medium preset averages 79 FPS, both above 60 FPS, while High averages 66 FPS. Only the Ultra preset falls below 60 FPS at 50 FPS.

Q: How does the RTX 4080's VRAM affect Rust performance?

A: The RTX 4080 has 16 GB of GDDR6X memory with a 256-bit bus and 716.8 GB/s bandwidth, which is ample for Rust's texture loading, as evidenced by the stable minimum FPS values even at 4K Medium.

Settings Recommendations

The data suggests that the best balance of visual quality and frame rate is achieved at the High preset for 1440p and 4K, or the Medium preset for 1080p. At 2560x1440, the High preset averages 112 FPS, which is well above the 60 FPS threshold for smooth gameplay, and it delivers better visual fidelity than Medium (133 FPS) without the performance cost of Ultra (85 FPS). For 3840x2160, the High preset averages 66 FPS, which is playable, but the Medium preset at 79 FPS with a minimum of 67 FPS offers a more comfortable margin for frame dips. The Low preset at 4K produces 117 FPS, but the visual compromise is significant in a game like Rust where visibility of distant objects matters for survival. At 1920x1080, the Medium preset at 186 FPS is the optimal choice, as it provides a high refresh rate experience while maintaining a minimum of 158 FPS, which is far above any display's refresh rate that would be paired with this hardware. The Ultra preset at 1080p yields 124 FPS, which is still excellent, but the extra visual effects may not justify the 62 FPS loss compared to Medium.

GPU Role

The NVIDIA GeForce RTX 4080 plays a dominant role in determining Rust's performance at higher resolutions, as evidenced by the FPS scaling patterns. The GPU's 16 GB of GDDR6X memory is critical for handling the game's large textures and world assets, and the measured data shows no signs of memory-related stuttering, as the minimum FPS values at 1440p Medium (113 FPS) and 4K Medium (67 FPS) remain high. The RTX 4080's boost clock of 2505 MHz and 9728 shading units contribute to its raw compute throughput, which is reflected in the Passmark G3D score of 34457. The GPU's 76 RT cores and 304 tensor cores are not directly relevant to Rust's non-ray-traced rendering, but they add to the overall silicon complexity that allows for high fill rates. The 280.6 GPixel/s pixel rate and 761.5 GTexel/s texture rate are sufficient to maintain the measured frame rates, as the card never dips below 50 FPS even at 4K Ultra.

The GPU's nearest rival, the RTX 4080 SUPER, has an average benchmark score that is only 0.1% higher (54209 vs 54247), meaning that in Rust, this RTX 4080 performs essentially identically to its successor. The data shows that the GPU's 320 W TDP and triple-slot cooler are justified by the performance on offer, though no power consumption figures are provided in the measured rows. The 16 GB VRAM capacity is a key advantage for Rust, as the game's procedurally generated maps can consume significant memory, and the 716.8 GB/s bandwidth ensures that texture streaming does not bottleneck frame delivery. Overall, the RTX 4080 is the stronger component in this pairing, and its performance headroom at 1080p suggests that users with high refresh rate monitors can maximize their experience by lowering settings, while 4K users should stick to Medium or High presets for the best balance.