Rust

This combo pairs AMD’s 6-core Ryzen 5 8400F with NVIDIA’s flagship RTX 4090 in Rust, a survival game known for heavy CPU demands and large server populations. The benchmark results show a pairing that delivers high frame rates across all tested settings, with the GPU often acting as the primary driver of performance at higher resolutions and quality presets. The data indicates a system capable of smooth 4K play and very high refresh-rate 1080p gaming, though the CPU’s role becomes more apparent at lower settings.

How This Combo Ranks

Among 1,717 tested combos in Rust, this configuration ranks 47th overall. That places it in the top 2.7% of all combinations tested, a strong showing that reflects the raw power of the RTX 4090 and the capable Zen 4 architecture of the Ryzen 5 8400F. The ranking is dominated by the GPU’s massive compute resources, but the CPU’s 6 cores and 12 threads are sufficient to avoid becoming a severe bottleneck in most scenarios.

The 8400F’s average benchmark score is 25,064, which places it in the 82nd percentile of all CPUs. Its nearest rivals in synthetic tests include the AMD Ryzen 7 2700X with an average score of 25,057 (a 0% delta), the Ryzen AI 5 PRO 340 at 25,099 (-0.1% delta), and the Ryzen 5 7500F at 24,993 (0.3% delta). This means the 8400F is essentially tied with those processors in general compute performance, showing that its 6-core/12-thread design holds its own against older 8-core parts and near-identical modern siblings. In Rust specifically, the 47th rank out of 1,717 combos suggests the system is well-balanced for this title, with no single component dragging the overall result down.

GPU Role

The RTX 4090 is the dominant force in this pairing, contributing 24 GB of GDDR6X memory on a 384-bit bus, which yields a memory bandwidth of 1.01 TB/s. The GPU’s boost clock is 2520 MHz, and it houses 16,384 shading units. These specifications translate into enormous rasterization throughput, which is directly reflected in the measured FPS. The GPU sits in the 91st percentile of all graphics cards based on average benchmark scores, with an average score of 66,473. Its nearest rivals in synthetic benchmarks are professional workstation cards like the Tesla T4 (66,733, -0.4% delta) and Quadro P6000 (67,320, -1.3% delta), but those parts lack the gaming-oriented feature set and driver optimizations of the GeForce 40-series.

In Rust, the GPU’s role scales with resolution and settings. At 1080p Low, the frame rate reaches 217.9 FPS, but at 4K Ultra it drops to 58.3 FPS. This 73% reduction in performance from the lowest to the highest workload shows how the game’s visual complexity stresses the GPU. The memory capacity is more than sufficient for Rust’s textures, and the high bandwidth ensures that large draw distances and complex scenes don’t cause hitches. The data suggests that the RTX 4090 is rarely the limiting factor at 1080p, but at 4K Ultra, it is clearly the component that determines the final frame rate.

FAQ

Q: Is this combo better for high refresh rate 1080p or smooth 4K gaming in Rust?

A: The measured FPS shows it can do both. At 1920x1080 with Low settings, it reaches 217.9 FPS, which suits a 240Hz monitor. At 3840x2160 with High settings, it maintains 71.3 FPS, which is playable on a 60Hz or 120Hz 4K display. The choice depends on whether you prioritize competitive frame rates or visual fidelity.

Q: How does the Ryzen 5 8400F compare to its closest CPU rivals in synthetic benchmarks?

A: The 8400F scores 25,064 on average, which is essentially identical to the Ryzen 7 2700X (25,057, 0% delta), the Ryzen AI 5 PRO 340 (25,099, -0.1% delta), and the Ryzen 5 7500F (24,993, 0.3% delta). These differences are within noise, so the CPU’s performance is on par with those alternatives.

Q: Can the RTX 4090 maintain 60 FPS at 4K in Rust?

A: Yes. At 3840x2160 with High settings, the average FPS is 71.3, and at Medium it is 89.3. Even at Ultra, it stays above 58 FPS, which is close to but slightly below a 60 FPS target. For a locked 60 FPS at 4K, High settings is the safest choice.

Q: What is the performance difference between Low and Ultra settings at 1440p?

A: At 2560x1440, Low settings produce 189.6 FPS, while Ultra produces 97.9 FPS. This is a 48% reduction in frame rate when moving from Low to Ultra, reflecting the increased GPU load from higher-quality shadows, textures, and draw distances.

Q: Does the CPU bottleneck the GPU at any tested setting?

A: The data does not show a clear CPU bottleneck. At 1080p Low, the system hits 217.9 FPS, which is high but not extreme for this GPU. The 8400F’s 6 cores and 12 threads with a boost clock of 4.70 GHz are sufficient to feed the RTX 4090 in Rust’s typical scenarios, though the game’s server-side simulation can be CPU-intensive on crowded servers.

Q: How does the combo rank compare to the total number of tested configurations?

A: This combo ranks 47th out of 1,717 tested combos in Rust. That places it in the top 3% of all configurations, indicating a very high level of performance for this specific game.

Measured FPS Breakdown

The measured FPS data covers three resolutions and four quality presets, providing a clear picture of scaling. At 1920x1080, the frame rates are consistently high. Low settings yield 217.9 FPS, Medium yields 185.9 FPS, High yields 175.5 FPS, and Ultra yields 138.1 FPS. The gap between High and Ultra is 37.4 FPS, which is significant for competitive play, but even Ultra remains above 138 FPS, suitable for high-refresh-rate monitors.

Moving to 2560x1440, the performance drops but remains strong. Low settings produce 189.6 FPS, Medium produces 144.4 FPS, High produces 123.4 FPS, and Ultra produces 97.9 FPS. The transition from 1080p to 1440p at the same setting costs roughly 30-40 FPS, which is expected given the increased pixel count. The 1440p Ultra result of 97.9 FPS is still well above 60 FPS, making this resolution ideal for high-refresh-rate 1440p panels with maxed-out settings.

At 3840x2160, the GPU is clearly the limiting factor. Low settings deliver 131.2 FPS, Medium delivers 89.3 FPS, High delivers 71.3 FPS, and Ultra delivers 58.3 FPS. The jump from Low to Medium is a 41.9 FPS drop, while the jump from Medium to High is an 18.0 FPS drop. The final step to Ultra costs 13.0 FPS. This scaling shows that Rust’s Ultra preset at 4K is extremely demanding, but the RTX 4090 still manages to stay playable. For a smooth 60 FPS experience at 4K, High settings are the recommended ceiling, as they provide a 13.0 FPS buffer over Ultra.

Settings Recommendations

The optimal settings depend on your target resolution and refresh rate. For 1080p gaming, the data shows that High settings at 175.5 FPS provide a good balance between visual quality and performance, especially for players with 144Hz or 165Hz monitors. If you have a 240Hz display, Low settings at 217.9 FPS will maximize your competitive advantage, but you will sacrifice visual fidelity. Ultra at 1080p still delivers 138.1 FPS, which is smooth, but the jump to High only costs 37.4 FPS and provides a noticeable improvement in image quality.

For 1440p, the sweet spot is High settings at 123.4 FPS. This offers a smooth experience on 120Hz monitors while maintaining high visual quality. Medium at 144.4 FPS is also viable if you prefer a higher frame rate buffer. Ultra at 97.9 FPS is playable on 100Hz displays, but the 25.5 FPS difference between High and Ultra may not justify the visual gain for most users. Low settings at 189.6 FPS are only recommended for esports-focused players who want the absolute highest frame rates.

For 4K gaming, High settings at 71.3 FPS is the recommended preset. It provides a solid 60+ FPS experience with good visual quality. Medium at 89.3 FPS offers more headroom and is ideal for 90Hz 4K monitors, but the visual downgrade from High is noticeable. Ultra at 58.3 FPS is borderline for a 60Hz display, and the 13.0 FPS drop from High makes it less desirable. Low at 131.2 FPS is unnecessary at 4K, as the resolution itself already provides high detail, and the lower settings will make textures look flat.

CPU Role

The AMD Ryzen 5 8400F is a 6-core, 12-thread processor based on the Zen 4 architecture, codenamed Phoenix, and manufactured on TSMC’s 4 nm process. It has a base clock of 4.20 GHz and a boost clock of 4.70 GHz, with 16 MB of shared L3 cache. The CPU’s synthetic performance is solid: it scores 20,851 in Cinebench R23 multi-core and 2,943 in single-core, and it achieves 6,165 in 3DMark’s max-thread test. In PassMark, it scores 24,530 in multithread and 3,684 in single-thread.

In Rust, the CPU’s role is to handle game logic, entity updates, and server communication. The measured FPS shows that the 8400F is capable of driving the RTX 4090 to high frame rates, especially at lower resolutions. At 1080p Low, the system reaches 217.9 FPS, which suggests the CPU can keep up with the GPU’s output. However, the CPU’s 6 cores and 12 threads may become a limiting factor in highly populated servers where Rust’s simulation thread is under heavy load. The 8400F’s 82nd percentile ranking among all CPUs indicates it is a solid mid-range performer, but it is not in the top tier for heavily threaded workloads.

Compared to its nearest rivals, the 8400F is functionally identical in performance to the Ryzen 7 2700X, which has 8 cores and 16 threads. This is notable because the 2700X is an older architecture but offers more cores, yet the 8400F’s higher IPC and clock speeds compensate for the core deficit. In Rust, the data suggests that the CPU’s single-thread performance is more important than raw core count, as the game’s main thread often limits performance. The 8400F’s single-core score of 2,943 in Cinebench R23 is respectable and should handle Rust’s primary thread adequately. For 4K gaming, the CPU’s role diminishes, as the GPU becomes the bottleneck, and the 8400F is more than sufficient to avoid holding back the RTX 4090 at those resolutions.