Rust

The AMD Ryzen 5 8400F pairs with the NVIDIA GeForce RTX 5090 in Rust, a survival title that tests both processor and graphics throughput. The CPU brings 6 cores and 12 threads from the Zen 4 architecture, with a base clock of 4.20 GHz and a boost clock of 4.70 GHz. The GPU, built on the Blackwell 2.0 architecture, carries 32 GB of GDDR7 memory on a 512-bit bus, yielding 1.79 TB/s of bandwidth. Measured frame rates across three resolutions and four quality presets show a system that scales predictably, though the data reveals where each component takes charge. This analysis walks through the CPU's role, answers common questions, examines resolution scaling, recommends settings, ranks the combo, breaks down every measured FPS, and closes with the GPU's contribution.

CPU Role — cores, clocks, and how they relate to this game's results

Rust is known for heavy server-side simulation and world persistence, but the client still demands consistent single-thread performance for physics, entity updates, and building interactions. The Ryzen 5 8400F's 6 cores and 12 threads provide enough parallelism for background tasks, while its 4.70 GHz boost clock handles the latency-sensitive main thread. In synthetic benchmarks, the CPU scores 951 in 3dmark_single_thread and 3685 in passmark_single_thread, placing it in the 77th percentile among all CPUs. That percentile indicates solid single-thread capability, which aligns with Rust's tendency to favor fewer, faster cores over massive core counts.

The L3 cache is 16 MB shared, which is modest by modern standards but adequate for a survival game where asset streaming and procedural map data are frequent. The 4 nm process node and 65 W TDP suggest thermal headroom, allowing sustained boost clocks during long sessions. In measured Rust results, the CPU's influence appears most clearly at 1080p Low, where the average FPS hits 216. At that setting, the GPU is not the bottleneck, so the CPU's single-thread speed and memory latency become the limiting factors. The 83.2 GB/s memory bandwidth from dual-channel DDR5 supports this, as Rust's world streaming benefits from fast memory access.

Compared to its nearest rivals, the Ryzen 5 8400F sits nearly level with the AMD Ryzen 5 7500F (deltaPct 0.2) and the Intel Core i7-11850H (deltaPct 0.3), while trailing the AMD EPYC 9474F by 0.4%. These are marginal differences, meaning the CPU's performance class is well established. For Rust specifically, the data shows that at 1080p Low, the FPS ceiling is 216, which is likely near the CPU's practical limit for this game engine. At higher settings and resolutions, the CPU's role diminishes as the GPU takes over the workload.

The 3dmark multi-thread scores (6091 for 16 threads, 6165 for max threads) indicate the CPU scales reasonably with additional threads, but Rust rarely uses more than a handful. The passmark_multithread score of 24389 reinforces that this is a mainstream part, not a workstation behemoth. For this game, the CPU's job is to feed the GPU with consistent frame data, and the measured results suggest it does so without becoming a severe bottleneck until FPS targets exceed roughly 200 at low settings.

FAQ

Q: Does the Ryzen 5 8400F bottleneck the RTX 5090 in Rust?

A: At 1080p Low, the average FPS is 216, while at 4K Low it drops to 132. The 1080p result is high but not extreme, suggesting the CPU limits the GPU at low settings. At 4K Low, the GPU is more involved, but the 216 FPS ceiling at 1080p indicates the CPU can cap performance before the GPU reaches its potential.

Q: How does this combo rank among all tested configurations?

A: The combo ranks 136th out of 3723 tested combos, placing it in the top 3.7% of all configurations. This is a strong showing, though not the absolute top tier, since some combos with higher-end CPUs achieve better frame rates in CPU-bound scenarios.

Q: What is the best resolution for this combo based on the data?

A: At 1440p High, the average FPS is 127, while at 4K High it falls to 75. The 1440p row offers a balance between visual fidelity and frame rate, with the 1080p Ultra row at 140 FPS also viable. The data suggests 1440p is the sweet spot for high refresh rates without sacrificing quality.

Q: Which settings preset yields the highest FPS?

A: The Low preset at 1080p delivers 216 FPS on average, which is the highest measured value. At 1440p Low, the average is 191 FPS, and at 4K Low it is 132 FPS. Lower settings reduce GPU load, allowing the CPU to push more frames.

Q: How much FPS does the Ultra preset cost compared to Low?

A: At 1080p, Ultra drops the average from 216 FPS (Low) to 140 FPS (Ultra), a reduction of 76 FPS. At 1440p, the drop is from 191 FPS to 97 FPS, a difference of 94 FPS. At 4K, Ultra falls from 132 FPS to 57 FPS, a 75 FPS decrease. The penalty is consistent across resolutions.

Q: Is the RTX 5090's 32 GB VRAM necessary for Rust?

A: The data does not show VRAM usage, but the 32 GB capacity is far beyond Rust's typical needs. The GPU's 1.79 TB/s bandwidth and 512-bit bus provide ample headroom for large textures and draw distances, though the measured FPS differences between settings indicate that raw compute, not memory capacity, drives performance.

Resolution Scaling — how FPS drops from 1080p to 4K and what it says about the limiting component

The measured FPS rows reveal a clear pattern as resolution increases. At Low settings, the average FPS goes from 216 at 1080p to 191 at 1440p (an 11.6% drop) and then to 132 at 4K (a 30.9% drop from 1440p). This gradual decline suggests that at Low settings, the CPU remains a significant factor even at higher resolutions, since the GPU is not fully taxed. The 4K Low result of 132 FPS is still high, indicating the RTX 5090 has plenty of raw power, but the CPU's single-thread limit prevents higher frame rates.

At Medium settings, the pattern shifts. The 1080p average is 186 FPS, 1440p is 150 FPS (a 19.4% drop), and 4K is 89 FPS (a 40.7% drop from 1440p). The larger relative drop from 1440p to 4K shows the GPU becoming more involved at Medium quality. The 4K Medium row has a min FPS of 76 and max FPS of 102, suggesting some frame time variance, likely from world loading or entity spikes.

High settings show a steeper scaling curve. The 1080p average is 175 FPS, 1440p drops to 127 FPS (a 27.4% decline), and 4K falls to 75 FPS (a 40.9% decline from 1440p). This pattern indicates that at High, the GPU's shading and texture work starts to dominate, while the CPU still holds up. The 4K High result of 75 FPS is playable but not ideal for competitive play, and it suggests the GPU is the primary limiter at this resolution.

Ultra settings produce the largest resolution scaling. The 1080p average is 140 FPS, 1440p drops to 97 FPS (a 30.7% decline), and 4K falls to 57 FPS (a 41.2% decline from 1440p). The 4K Ultra result is the lowest measured, and the scaling from 1440p to 4K is proportionally similar to High, confirming that the GPU is the bottleneck at Ultra. Across all presets, the FPS drop from 1080p to 4K ranges from 38.9% (Low) to 59.3% (Ultra), with the larger drops at higher settings indicating GPU-bound scenarios.

The limiting component shifts with resolution. At 1080p Low, the CPU caps performance at 216 FPS; at 4K Ultra, the GPU's workload limits the system to 57 FPS. The data shows a smooth transition, with the CPU dominating at low resolutions and settings, and the GPU taking over as pixel count and quality rise. For players targeting high refresh rates at 1080p, the CPU is the ceiling; for 4K gaming, the GPU determines the experience.

Settings Recommendations — which preset gives the best experience per the measured rows

The measured rows provide four presets: Low, Medium, High, and Ultra, each with average FPS at three resolutions. The best experience depends on the target resolution and refresh rate, but the data allows for clear recommendations. At 1080p, Low offers 216 FPS, Medium 186 FPS, High 175 FPS, and Ultra 140 FPS. For a 144 Hz monitor, Medium or High both exceed the refresh rate, with High providing better visuals at 175 FPS. Ultra is still above 120 FPS, so even the highest preset is playable.

At 1440p, the options narrow. Low hits 191 FPS, Medium 150 FPS, High 127 FPS, and Ultra 97 FPS. For a 144 Hz display, Medium at 150 FPS is the best balance, staying above the refresh rate while offering improved textures and effects over Low. High at 127 FPS is also viable for a 120 Hz monitor, but for competitive play, Medium is the recommended preset. Ultra at 97 FPS is smooth but may not satisfy high-refresh users.

At 4K, the data shows the system's limits. Low delivers 132 FPS, Medium 89 FPS, High 75 FPS, and Ultra 57 FPS. For a 60 Hz display, Ultra at 57 FPS is just below the threshold, so Medium at 89 FPS is the safer choice for consistent frame delivery. Low at 132 FPS is the only preset that clears 120 FPS at 4K, making it the choice for high-refresh 4K monitors, though visual quality suffers. High at 75 FPS is acceptable for slower-paced exploration but not for firefights.

The Medium preset offers the most consistent experience across resolutions. At 1080p, it hits 186 FPS with a min of 158 and max of 214, providing stable frame times. At 1440p, it reaches 150 FPS with a min of 128 and max of 173, which is strong. At 4K, it drops to 89 FPS with a min of 76 and max of 102, still playable. The Medium preset's measured min/max values show tighter variance compared to other presets, suggesting fewer frame drops in demanding scenes. For most users, Medium is the recommended preset, with High being viable for those prioritizing visuals over raw FPS.

How This Combo Ranks — use comboRankInGame vs other tested combos

The AMD Ryzen 5 8400F and NVIDIA GeForce RTX 5090 combination ranks 136th out of 3723 tested combos in Rust. This puts the combo in the 96.3rd percentile, meaning it outperforms the vast majority of systems tested. The ranking reflects the RTX 5090's raw power, as the GPU's 92nd percentile among all GPUs and its average benchmark score of 79842 indicate top-tier performance. The CPU's 77th percentile is lower, but the combo's rank suggests the GPU compensates in GPU-bound scenarios.

In Rust specifically, the combo's rank is influenced by the game's CPU sensitivity. Many combos above this one likely feature higher-end CPUs like the Ryzen 7 or Core i7/i9 parts, which would push higher FPS at 1080p Low. However, the RTX 5090's massive compute resources ensure that at higher resolutions and settings, this combo remains competitive. The rank of 136 out of 3723 is a strong result, with only 135 combos achieving better average FPS across the test matrix.

The nearest GPU rivals to the RTX 5090, such as the NVIDIA Tesla P100 PCIe 16 GB (deltaPct 0.3) and AMD Radeon RX 6850M XT (deltaPct 1.1), have lower average scores, but the RTX 5090's lead in the combo ranking comes from its 32 GB memory and 1.79 TB/s bandwidth. In Rust, which can suffer from asset streaming stutter, the GPU's bandwidth helps maintain frame consistency. The combo's rank indicates that while the CPU is not the fastest, the GPU's dominance boosts the overall experience.

For players considering this combo, the rank suggests it is a high-end configuration that excels in GPU-heavy titles. In Rust, the 1080p Low result of 216 FPS is only 20.7% higher than the 4K Low result of 132 FPS, showing that the GPU is not fully utilized at low settings. The rank could improve with a stronger CPU, but the current setup is well above the median. The data confirms this is a top-tier pairing for most gaming scenarios, with the CPU being the only notable weakness.

Measured FPS Breakdown — resolution by resolution, settings by settings, exact numbers

At 1920x1080, the measured rows show a clear progression. Low settings produce an average of 216 FPS. Medium settings yield 186 FPS, with a minimum of 158 FPS and a maximum of 214 FPS. High settings deliver 175 FPS. Ultra settings drop to 140 FPS. The difference between Low and Ultra is 76 FPS, a 35.2% reduction.

At 2560x1440, the averages are lower. Low settings hit 191 FPS. Medium settings reach 150 FPS, with a minimum of 128 FPS and a maximum of 173 FPS. High settings provide 127 FPS. Ultra settings fall to 97 FPS. The gap from Low to Ultra is 94 FPS, a 49.2% reduction.

At 3840x2160, the FPS figures decrease further. Low settings average 132 FPS. Medium settings average 89 FPS, with a minimum of 76 FPS and a maximum of 102 FPS. High settings average 75 FPS. Ultra settings average 57 FPS. The difference from Low to Ultra is 75 FPS, a 56.8% reduction.

The 1080p Medium row has the most complete data, with min and max values (158 to 214) that show a 56 FPS range. The 1440p Medium row shows a range from 128 to 173, a 45 FPS spread. The 4K Medium row has a range from 76 to 102, a 26 FPS spread. These ranges indicate that frame time variance decreases as resolution increases, likely because the GPU becomes the stable bottleneck at higher pixel counts.

The highest measured FPS is 216 at 1080p Low. The lowest measured FPS is 57 at 4K Ultra. The median across all measured rows is 141 FPS (the average of 175 and 127, the two High settings). The data shows that Low settings always deliver over 130 FPS at any resolution, while Ultra settings only exceed 100 FPS at 1080p. For players seeking consistent performance, the Medium preset offers the most balanced numbers across all three resolutions.

GPU Role — VRAM, clocks, and how they relate to this game's results

The NVIDIA GeForce RTX 5090 brings 32 GB of GDDR7 memory, a 512-bit bus, and 1.79 TB/s of bandwidth. The memory clock runs at 1750 MHz with 28 Gbps effective speed. The GPU's base clock is 2017 MHz, boosting to 2407 MHz. These specifications translate to a pixel rate of 423.6 GPixel/s and a texture rate of 1,636.8 GTexel/s. The 21760 shading units and 176 ROPs provide massive compute throughput, with FP32 performance at 104.8 TFLOPS.

In Rust, the GPU's role varies by settings and resolution. At 1080p Low, the GPU is underutilized, as the CPU limits the frame rate to 216 FPS. The GPU's 32 GB VRAM is irrelevant at this setting, since Rust's assets are not memory-hungry. At 4K Ultra, the GPU becomes the dominant factor, with the average FPS falling to 57. This 57 FPS result is low for a flagship GPU, indicating that Rust's Ultra preset at 4K imposes a heavy shading load, likely from high draw distances and complex lighting.

The GPU's memory bandwidth is a key asset for Rust. The game streams large world data as players move, and the 1.79 TB/s bandwidth minimizes texture pop-in. The 32 GB capacity is excessive for Rust, which likely uses under 8 GB even at 4K, but the bandwidth ensures smooth asset loading. The 512-bit bus width allows the GPU to fetch data at high rates, which is beneficial in open-world scenarios.

Comparing the GPU to its nearest rivals, the RTX 5090's average benchmark score of 79842 places it slightly above the Tesla P100 PCIe 16 GB (deltaPct 0.3) and the AMD Radeon RX 6850M XT (deltaPct 1.1). The RTX 5090's 92nd percentile among all GPUs confirms its top-tier status. In Rust, the GPU's performance is most evident at 4K, where it maintains 75 FPS at High settings, a demanding workload that would challenge lesser cards.

The GPU's clock speeds are moderate for a flagship, but the sheer core count compensates. The 2407 MHz boost clock is not record-breaking, yet the 21760 shading units deliver the raw compute needed for high-resolution gaming. The 575 W TDP and 950 W suggested PSU indicate this is a power-hungry part, but the measured FPS show the payoff. At 1440p High, the GPU delivers 127 FPS, and at 1080p High, 175 FPS, demonstrating smooth performance without CPU interference. The GPU's role is to provide headroom at higher resolutions, and the data shows it does so effectively, though the CPU remains the limiting factor at low settings.