Rust

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

The AMD Ryzen 5 8400F is a 6-core, 12-thread processor built on the Zen 4 architecture, code-named Phoenix. It runs on the AMD Socket AM5 platform and is manufactured on TSMC's 4 nm process node. The chip's base clock is 4.20 GHz with a boost clock of 4.70 GHz, and it carries a 65 W TDP. The cache hierarchy consists of 64 KB of L1 per core, 1 MB of L2 per core, and 16 MB of shared L3 cache. Memory support is DDR5 over a dual-channel bus, yielding 83.2 GB/s of bandwidth.

In raw synthetic performance, the 8400F posts a Cinebench R23 multi-core score of 20,851 and a single-core score of 2,943. Its average benchmark score across all tests is 25,005, which places it at the 77th percentile among all CPUs. The nearest rival, the AMD Ryzen 5 7500F, averages 24,964 — just 0.2% behind. The Intel Core i7-11850H is 0.3% behind at 24,935, and the Intel Core i7-13620H is 0.4% behind at 24,911. On the other side, the AMD EPYC 9474F leads by 0.4% with a score of 25,103.

For Rust, a game that is heavily reliant on draw calls and world simulation, the CPU's thread count and single-thread performance both matter. The 8400F's 12 threads allow it to handle the game's background tasks — such as AI, physics, and server-side simulation in multiplayer — while the strong single-core score of 2,943 in Cinebench R23 ensures the main game thread has enough headroom. The measured FPS data at 1080p is revealing: at Low settings, the combo hits 216 FPS, which is far above the refresh rate of typical monitors, indicating the CPU is not a bottleneck at that resolution. At Ultra settings, 1080p drops to 104 FPS, showing that the GPU begins to take over as the limiting factor even at lower resolutions.

The 8400F's 3DMark multi-thread score of 6,165 and 2-thread score of 1,874 further confirm that scaling from 2 to 12 threads is modest but sufficient. Rust does not scale perfectly across cores, but the 8400F's 6 physical cores provide a solid foundation. The data suggests that in CPU-bound scenarios, such as large player bases with many structures, the 8400F will maintain playable framerates, though it is not a top-tier part — the 77th percentile ranking places it above most CPUs but below the high-end desktop parts.

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

The NVIDIA GeForce RTX 5070 is built on the Blackwell 2.0 architecture with the GB205 chip, manufactured on TSMC's 5 nm process. It features 6,144 shading units, 192 texture mapping units, and 80 raster output units. The chip contains 48 RT cores and 192 tensor cores. The GPU operates at a base clock of 2325 MHz and a boost clock of 2512 MHz. Memory is 12 GB of GDDR7 on a 192-bit bus, delivering 672.0 GB/s of bandwidth. The card's FP32 compute is rated at 30.87 TFLOPS, and its pixel rate is 201.0 GPixel/s with a texture rate of 482.3 GTexel/s.

In synthetic benchmarks, the RTX 5070 achieves a Passmark G3D score of 29,137 and a Geekbench Vulkan score of 178,923. Its average benchmark score is 40,377, placing it at the 82nd percentile among all GPUs. The nearest rivals are professional workstation cards: the AMD Radeon Pro 580 scores 40,318 (0.1% behind), the Radeon Pro WX 7100 scores 40,063 (0.8% behind), and the Radeon Pro 5300 scores 40,870 (1.2% ahead). The NVIDIA RTX A500 Mobile trails by 2% with a score of 39,568.

For Rust, the GPU's 12 GB of VRAM is sufficient for the game's textures and draw distances at 1080p and 1440p, but at 4K the memory pressure increases. The measured data shows that at 4K High settings, the combo averages 55 FPS, while at 4K Low it jumps to 98 FPS. The 672.0 GB/s of bandwidth helps when loading large texture packs and handling the game's procedurally generated environments. The RTX 5070's 80 ROPs are adequate for the rasterization workload, and the 48 RT cores are not heavily utilized in Rust, which lacks intensive ray tracing.

The GPU's boost clock of 2512 MHz is modest, but the architecture's efficiency compensates. The measured FPS at 1440p High is 94 FPS, and at 1080p High it is 136 FPS. These numbers indicate that the RTX 5070 is well-matched to the 8400F in Rust — the GPU can push high framerates without being severely bottlenecked by the CPU, and vice versa. The 82nd percentile ranking for the GPU is higher than the CPU's 77th percentile, suggesting that the GPU has more headroom relative to its peers than the CPU does.

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

Examining the measured FPS across resolutions reveals a clear pattern of GPU scaling. At High settings, the combo delivers 136 FPS at 1080p, drops to 94 FPS at 1440p, and falls to 55 FPS at 4K. This is a 31% drop from 1080p to 1440p, and a 60% drop from 1080p to 4K. The scaling is consistent with a GPU-bound scenario at higher resolutions — the RTX 5070 is doing more work per frame as pixel count increases.

At Low settings, the pattern is similar but with higher absolute numbers: 216 FPS at 1080p, 165 FPS at 1440p, and 98 FPS at 4K. The drop from 1080p to 1440p is 24%, and from 1080p to 4K is 55%. The fact that Low settings at 4K (98 FPS) is still above 60 FPS indicates that the GPU has enough raw power to handle the resolution when visual fidelity is reduced.

Medium settings show the most complete data, with min and max FPS recorded. At 1080p Medium, the average is 161 FPS with a min of 137 and max of 186. At 1440p Medium, the average drops to 111 FPS with a min of 94 and max of 128. At 4K Medium, the average is 66 FPS with a min of 56 and max of 75. The min FPS at 4K Medium (56) is below the 60 FPS threshold, indicating that there are moments where the GPU struggles to maintain smooth gameplay.

Ultra settings show the steepest drop: 104 FPS at 1080p, 71 FPS at 1440p, and 42 FPS at 4K. The 4K Ultra result is below 60 FPS, making it unsuitable for smooth play. The scaling from 1080p to 4K at Ultra is a 60% reduction, which is expected given the heavier shading and texture work.

The limiting component analysis is nuanced. At 1080p Low, the CPU is likely the bottleneck, as 216 FPS is near the practical limit for a 6-core processor in Rust. At 4K Ultra, the GPU is clearly the limiting factor, as evidenced by the 42 FPS average. The crossover point appears to be around 1440p Medium, where the combined load is balanced — the 111 FPS average suggests neither component is severely overworked. The data indicates that for most users, 1440p is the sweet spot for this combo, with 1080p being CPU-limited and 4K being GPU-limited.

How This Combo Ranks — use comboRankInGame vs other tested combos

The AMD Ryzen 5 8400F paired with the NVIDIA GeForce RTX 5070 ranks 702nd out of 3,723 tested combos in Rust. This places the combo in the top 19% of all configurations tested. The rank is a composite measure that accounts for performance across all settings and resolutions, weighted by how the game responds to each component.

The 702nd rank out of 3,723 is respectable but not outstanding. It reflects the fact that the 8400F is a mid-range CPU (77th percentile) and the RTX 5070 is a high-end GPU (82nd percentile). The combination of a solid GPU with a mid-range CPU means the combo performs well in GPU-bound scenarios but lags in CPU-bound ones. In Rust, which is known for CPU sensitivity in multiplayer servers, the 8400F's 6 cores may hold back the RTX 5070 in certain situations.

Compared to combos with higher ranks, this pairing likely trails those with stronger CPUs like the Ryzen 7 or Intel Core i7/i9 parts, which can feed the RTX 5070 more effectively in Rust's simulation-heavy gameplay. However, the 702nd rank also means the combo outperforms the majority of tested configurations, which include older GPUs and CPUs. The data shows that this combo is well-balanced for 1440p gaming, as evidenced by the 94 FPS at High settings, which is a common target for competitive play.

The rank also suggests that users upgrading from an older CPU but keeping the RTX 5070 would see better results, as the GPU has headroom. Conversely, users with a stronger CPU but a weaker GPU would be GPU-limited. The 702nd rank is a strong indicator that this is a viable gaming combo for Rust, though not a top-tier one.

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

Based on the measured FPS data, the best settings depend on the target resolution and framerate. For 1080p, the High preset at 136 FPS is the best balance of visual quality and performance. It is well above 60 FPS and close to 144 Hz for monitors. The Ultra preset at 104 FPS is also playable but offers diminishing returns in visual fidelity for a 24% performance loss. The Low preset at 216 FPS is excessive for most displays and sacrifices too much visual quality.

For 1440p, the High preset at 94 FPS is the recommended choice. It is above 60 FPS and suitable for 144 Hz monitors, though not maxing them out. The Medium preset at 111 FPS is also viable if higher framerates are preferred, but the visual difference between Medium and High is noticeable in Rust's foliage and draw distances. The Ultra preset at 71 FPS is just above 60 FPS but may drop below in busy scenes, making it risky for competitive play.

For 4K, the Low preset at 98 FPS is the only option that provides a smooth experience above 60 FPS. The Medium preset at 66 FPS is borderline, with a min FPS of 56, meaning there will be stutters. The High preset at 55 FPS is below 60 FPS and not recommended. The Ultra preset at 42 FPS is unplayable for most users.

The best overall experience per the measured rows is 1440p High at 94 FPS. This resolution balances the CPU and GPU loads, providing smooth gameplay with good visual fidelity. For users with 1080p monitors, the High preset is optimal. For 4K users, the Low preset is the only viable choice, which suggests that this combo is not ideal for 4K gaming in Rust.

FAQ

Q: Can this combo run Rust at 60 FPS in 4K?

A: Yes, but only at Low settings, where the average FPS is 98. At Medium settings, the average is 66 FPS, but the min FPS is 56, which may cause occasional stutters. High and Ultra presets both fall below 60 FPS.

Q: Is the CPU or GPU the bottleneck in Rust?

A: At 1080p Low, the CPU is likely the bottleneck, as the combo reaches 216 FPS. At 4K Ultra, the GPU is clearly the bottleneck, with 42 FPS. At 1440p Medium, the load is balanced, as evidenced by the 111 FPS average.

Q: What is the best resolution for this combo?

A: The data suggests 1440p is the best resolution. At High settings, the combo delivers 94 FPS, which is above 60 FPS and suitable for most displays. 1080p is CPU-limited, and 4K is GPU-limited.

Q: How does the Ryzen 5 8400F compare to its nearest rival in benchmarks?

A: The 8400F has an average benchmark score of 25,005, which is 0.2% ahead of the AMD Ryzen 5 7500F (24,964) and 0.3% ahead of the Intel Core i7-11850H (24,935). The AMD EPYC 9474F is 0.4% ahead at 25,103.

Q: Does the RTX 5070 have enough VRAM for Rust?

A: The 12 GB of GDDR7 memory is sufficient for Rust at all tested settings. The game does not appear to exceed this capacity, as the performance scaling from Low to Ultra is consistent with compute and bandwidth limits rather than memory capacity issues.

Q: What is the highest FPS recorded for this combo?

A: The highest average FPS is 216 at 1080p Low settings. The highest max FPS is 186 at 1080p Medium, with an average of 161 FPS.

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

1080p (1920x1080):

• Low: 216 FPS average
• Medium: 161 FPS average, 137 FPS min, 186 FPS max
• High: 136 FPS average
• Ultra: 104 FPS average

1440p (2560x1440):

• Low: 165 FPS average
• Medium: 111 FPS average, 94 FPS min, 128 FPS max
• High: 94 FPS average
• Ultra: 71 FPS average

4K (3840x2160):

• Low: 98 FPS average
• Medium: 66 FPS average, 56 FPS min, 75 FPS max
• High: 55 FPS average
• Ultra: 42 FPS average

The data shows a consistent pattern: each step up in settings reduces FPS by roughly 20-30%, and each step up in resolution reduces FPS by a similar margin. The Medium preset at each resolution has the most complete data, with min and max FPS recorded, showing that the variance is about 31-38 FPS at 1080p, 34 FPS at 1440p, and 19 FPS at 4K. This variance is important for understanding gameplay smoothness — the 4K Medium min of 56 FPS is below the 60 FPS target, while the 1080p Medium min of 137 FPS is well above it. The Ultra preset at 4K (42 FPS) is the only setting below 45 FPS, making it unsuitable for even casual play. The Low preset at 1080p (216 FPS) is the only setting above 200 FPS, indicating CPU limitations at that level.