Rust

The AMD Ryzen 5 8400F and AMD Radeon RX 6800 XT combination delivers a highly playable Rust experience, though the data reveals a system that scales predictably with resolution and settings. At 1080p, the combo produces excellent frame rates, while 4K places significant strain on the GPU, indicating a clear performance hierarchy. This analysis breaks down the measured FPS data to explain how the CPU and GPU interact in this specific survival title.

Resolution Scaling

The FPS drop from 1080p to 4K is substantial and tells a clear story about which component is the limiting factor. At Low settings, the average frame rate falls from 209.5 FPS at 1920x1080 to 146.9 FPS at 2560x1440, a reduction of 62.6 FPS, and then further down to 83.1 FPS at 3840x2160. This represents a 60.3% performance loss from 1080p to 4K at Low settings, showing how quickly the GPU becomes the bottleneck as pixel count increases.

The scaling pattern is consistent across all quality presets. At High settings, the frame rate drops from 119.9 FPS at 1080p to 79.9 FPS at 1440p, then to 45.4 FPS at 4K — a 62.1% total reduction. The Ultra preset shows the same trend, going from 88 FPS at 1080p to 63.9 FPS at 1440p and finally 39.4 FPS at 4K. The percentage drop between 1080p and 1440p averages around 33-38% across settings, while the drop from 1440p to 4K averages another 38-48%, indicating that the RX 6800 XT’s memory bandwidth and compute resources are being progressively saturated.

At 1080p Low, the 209.5 FPS result suggests the CPU is still capable of feeding the GPU efficiently, but the gap between Low and Ultra at 1080p (209.5 vs 88 FPS) shows that the GPU’s shading units and ROPs are heavily taxed by higher quality settings. The data indicates Rust is a GPU-bound title at 1440p and 4K for this combo, while 1080p gives the CPU more headroom to demonstrate its single-thread strength.

FAQ

Q: What is the best resolution for this combo in Rust to maintain high FPS?

A: The data shows 1920x1080 is the clear winner for high frame rates, with Low settings producing 209.5 FPS and even Ultra settings reaching 88 FPS. At 2560x1440, the combo still delivers solid results, with Low settings hitting 146.9 FPS and High settings at 79.9 FPS.

Q: How does the RX 6800 XT handle 4K gaming in Rust?

A: At 3840x2160, the GPU produces 83.1 FPS on Low settings, 59.7 FPS on Medium, 45.4 FPS on High, and 39.4 FPS on Ultra. The 4K results show the card can handle the resolution but struggles with higher quality presets, making Medium or Low the more practical choices for 4K play.

Q: Is the Ryzen 5 8400F a bottleneck for the RX 6800 XT in this game?

A: The 1080p Low result of 209.5 FPS indicates the CPU is not severely limiting the GPU. The Ryzen 5 8400F has a single-thread score of 951 in 3dmark, and its boost clock of 4.70 GHz helps maintain high frame rates. The scaling pattern suggests the GPU becomes the primary bottleneck at higher resolutions.

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

A: At 2560x1440, Low settings produce 146.9 FPS, while Ultra settings drop to 63.9 FPS. This 83 FPS difference represents a 56.5% performance penalty for enabling Ultra quality, which is significant for competitive play.

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

A: The combination ranks 531 out of 1717 tested combos in Rust, placing it in the upper 31% of all tested systems. This is a strong position given the game’s demanding nature and the hardware’s mid-to-high tier positioning.

Q: Does the RX 6800 XT’s 16 GB VRAM matter for Rust?

A: While the data does not directly measure VRAM usage, the 16 GB GDDR6 memory with 512.0 GB/s bandwidth is substantial. The consistent FPS drops at 4K Ultra (39.4 FPS) suggest the GPU’s compute capability, not memory capacity, is the limiting factor in this scenario.

GPU Role

The AMD Radeon RX 6800 XT is built on the RDNA 2.0 architecture with a Navi 21 chip, featuring 4608 shading units and 128 ROPs. Its boost clock of 2250 MHz and game clock of 2015 MHz provide the raw compute power needed for Rust’s rendering. The GPU’s 20.74 TFLOPS FP32 performance and 648.0 GTexel/s texture rate are directly relevant to the game’s terrain and object rendering.

The 16 GB of GDDR6 memory on a 256-bit bus delivers 512.0 GB/s of bandwidth, which is critical for streaming textures in a game like Rust where large maps and many entities are common. The measured FPS data shows the GPU’s performance ceiling: at 4K Ultra, the combo achieves 39.4 FPS, while at 1080p Low it reaches 209.5 FPS. This wide range (170 FPS difference) demonstrates that the RX 6800 XT has significant headroom at lower resolutions but becomes the limiting factor at 4K.

The GPU’s 87th percentile ranking among all GPUs, with an average benchmark score of 49982, places it above the NVIDIA GeForce RTX 4070 Ti SUPER (48704, deltaPct 2.6) and Intel Arc A550M (49737, deltaPct 0.5). The card’s DirectX 12 Ultimate support (12_2) ensures compatibility with modern rendering paths. The 300 W TDP and dual-slot design indicate this is a power-hungry component, but the performance data justifies its inclusion in this combo for 1080p and 1440p gaming.

Measured FPS Breakdown

At 1920x1080, the combo produces its best results. Low settings achieve 209.5 FPS, Medium 138.6 FPS, High 119.9 FPS, and Ultra 88 FPS. The step from Low to Medium is a 70.9 FPS drop, while the step from High to Ultra is only 31.9 FPS, showing diminishing returns for the highest preset. These 1080p numbers indicate the CPU and GPU work well together to push frame rates above 120 FPS for most settings.

At 2560x1440, performance remains strong but the GPU begins to show strain. Low settings deliver 146.9 FPS, Medium 95.6 FPS, High 79.9 FPS, and Ultra 63.9 FPS. The 1440p results are roughly 30-36% lower than 1080p across all settings, which is consistent with the increased pixel workload. The Ultra preset at 1440p still clears 60 FPS, making it viable for smooth gameplay.

At 3840x2160, the RX 6800 XT struggles with higher presets. Low settings produce 83.1 FPS, Medium 59.7 FPS, High 45.4 FPS, and Ultra 39.4 FPS. The 4K results show a clear breakpoint: Medium is the highest preset that maintains playable frame rates above 60 FPS. High and Ultra dip below 50 FPS, which may be acceptable for less demanding scenarios but not ideal for intense firefights.

The overall pattern shows a linear scaling with resolution, with the 1080p to 1440p drop averaging 35% and the 1440p to 4K drop averaging 43%. This suggests Rust’s rendering pipeline is heavily pixel-bound, and the RX 6800 XT’s 512.0 GB/s bandwidth is insufficient for 4K Ultra in this title.

How This Combo Ranks

The combo ranks 531 out of 1717 tested combinations in Rust, placing it in the top 31% of all systems. This is a respectable position for a mid-range CPU paired with a high-end GPU. The ranking reflects the balanced nature of this configuration: the Ryzen 5 8400F provides sufficient single-thread performance, while the RX 6800 XT handles the graphical workload.

Given the CPU’s 82nd percentile ranking among all CPUs, with an average benchmark score of 25064, it sits close to the AMD Ryzen 7 2700X (25057, deltaPct 0) and the AMD Ryzen 5 7500F (24993, deltaPct 0.3). The GPU’s 87th percentile ranking, with an average score of 49982, places it slightly above the NVIDIA GeForce RTX 4070 Ti SUPER (48704, deltaPct 2.6). The combo’s rank of 531 suggests that while neither component is top-tier alone, their combination works well for Rust’s specific demands.

The ranking also indicates that many higher-ranked combos likely feature newer or more powerful GPUs, but the 531st position shows this setup is capable of handling the game’s requirements without major compromises. The measured FPS data supports this: at 1080p, the combo delivers frame rates well above 60 FPS for all settings, and at 1440p it maintains playable performance for most presets.

CPU Role

The AMD Ryzen 5 8400F is a 6-core, 12-thread processor based on the Zen 4 architecture (Phoenix codename) built on TSMC’s 4 nm process. Its base clock of 4.20 GHz and boost clock of 4.70 GHz provide strong single-thread performance, which is crucial for Rust’s simulation and physics calculations. The 3dmark single-thread score of 951 and 2-thread score of 1874 indicate good responsiveness for game logic.

The CPU’s 16 MB of shared L3 cache and 1 MB per-core L2 cache help reduce memory latency, which benefits Rust’s frequent entity updates and world state changes. The 83.2 GB/s memory bandwidth on a dual-channel DDR5 interface provides adequate throughput for feeding the GPU. The 65 W TDP shows this is an efficient processor, but the data confirms it does not bottleneck the RX 6800 XT in most scenarios.

In Rust, the CPU’s role is evident in the 1080p Low result of 209.5 FPS, which demonstrates the processor can handle high frame rates when the GPU is not the limiting factor. However, the 3dmark multi-thread scores (6091 for 16 threads, 6165 for max threads) show the CPU’s limits in heavily threaded scenarios, which may affect performance in crowded servers with many players and structures. The passmark single-thread score of 3684 and multithread score of 24530 provide additional context for its overall compute capability.

The CPU’s 82nd percentile ranking, with nearest rivals including the AMD Ryzen 7 2700X (25057, deltaPct 0) and AMD Ryzen 5 7500F (24993, deltaPct 0.3), places it in a competitive position for gaming. The 4.70 GHz boost clock is particularly beneficial for Rust, which relies on fast single-thread execution for its core game loop. The data suggests the CPU is well-matched to the GPU, allowing the RX 6800 XT to reach its full potential at 1080p and 1440p resolutions.