Rust

The AMD Ryzen 5 8400F and AMD Radeon RX 9070 XT pairing in Rust demonstrates a fascinating split personality: it can deliver high refresh rates at lower resolutions, but struggles to maintain playable frames at 4K Ultra. The measured data reveals a system where the GPU's raw power is often held in check by the game's demands, making preset selection critical.

Settings Recommendations

The measured FPS rows make a compelling case for the Medium preset as the optimal balance across all resolutions. At 1080p, Medium delivers 147.5 FPS, which is 19.3 FPS higher than High and only 69.2 FPS lower than the Low preset’s 216.7 FPS. The jump from Low to Medium costs 69.2 FPS, but the visual uplift is substantial. At 1440p, Medium produces 101.6 FPS, maintaining a triple-digit experience that High cannot match (85.5 FPS). Even at 4K, Medium’s 61.6 FPS is the only preset besides Low that stays above 60 FPS, making it the highest-quality setting that still respects a 60 Hz display.

The Ultra preset is a trap in this configuration. At 1080p it drops to 97 FPS, at 1440p to 64 FPS, and at 4K to a barely interactive 36.6 FPS. The data indicates that Ultra’s incremental fidelity gains come at a disproportionately high performance cost. For competitive play, Low at 1080p offers the highest headroom at 216.7 FPS, but the scaling curve suggests that Medium is the most efficient use of the hardware’s capabilities. At 4K, users should avoid High and Ultra entirely, as the 51 FPS and 36.6 FPS averages respectively fall short of smooth gameplay thresholds.

FAQ

Q: Does the RX 9070 XT handle Rust better at 1080p or 1440p?

A: The data shows a 1080p advantage across all presets. At High, 1080p produces 128.2 FPS versus 85.5 FPS at 1440p, a 42.7 FPS gap. The difference narrows at Lower settings, with 216.7 FPS at 1080p versus 156.9 FPS at 1440p, but the 1080p row consistently leads by 59.8 to 49.8 FPS depending on the preset.

Q: Is the Ultra preset ever worth using with this combo?

A: Only at 1080p, where it achieves 97 FPS. At 1440p, Ultra falls to 64 FPS, and at 4K it collapses to 36.6 FPS. The drop from High to Ultra at 1080p is 31.2 FPS, which is a significant penalty for settings that may not be visually distinct in Rust’s environment.

Q: What is the best resolution for this pairing if aiming for 144 Hz?

A: The 1080p Low preset is the only row that exceeds 144 Hz, hitting 216.7 FPS. At 1080p Medium, the 147.5 FPS average is just above 144 Hz, making it the highest-quality option for high-refresh displays. No 1440p preset reaches 144 Hz, with the best being Low at 156.9 FPS, which is actually above 144 Hz, but Medium at 101.6 FPS falls short.

Q: How does the 4K performance compare to 1080p in terms of scaling?

A: The scaling is steep. At High, 4K delivers 51 FPS versus 128.2 FPS at 1080p, a 77.2 FPS reduction. At Low, the drop is from 216.7 to 92.3 FPS, a 124.4 FPS reduction. The percentage loss is greater at lower settings, indicating that resolution scaling is not linear and the GPU’s workload increases faster than the FPS curve suggests.

Q: Is the CPU a bottleneck at any resolution?

A: The data suggests the CPU becomes more relevant at lower resolutions. At 1080p Low, the 216.7 FPS average likely approaches the CPU’s limit, as the Ryzen 5 8400F has 6 cores and 12 threads with a 4.70 GHz boost clock. At 4K Ultra, the 36.6 FPS is clearly GPU-bound, as the RX 9070 XT’s 16 GB VRAM and 644.6 GB/s bandwidth are taxed by the higher pixel count.

Resolution Scaling

The measured FPS data reveals a clear pattern of diminishing returns as resolution increases. From 1080p to 1440p, the average FPS drops by roughly 33-35% across all presets. For example, at High, the 128.2 FPS at 1080p falls to 85.5 FPS at 1440p, a 42.7 FPS loss. At Low, the drop is from 216.7 to 156.9 FPS, a 59.8 FPS loss. This consistent proportional decline suggests the GPU is the primary limiter in this range, as the RX 9070 XT’s 4096 shading units and 128 ROPs are increasingly taxed by the higher pixel throughput.

The transition from 1440p to 4K is more severe, indicating a shift in bottleneck behavior. At High, 85.5 FPS at 1440p falls to 51 FPS at 4K, a 34.5 FPS loss. At Low, the drop is from 156.9 to 92.3 FPS, a 64.6 FPS loss. The 4K Ultra result of 36.6 FPS highlights the GPU’s limits, as the pixel rate of 380.2 GPixel/s is overwhelmed by 8.3 million pixels per frame. The data implies that at 4K, the RX 9070 XT’s 16 GB VRAM is sufficient, but the compute throughput is not enough to maintain high frame rates at higher presets.

The scaling curve suggests that the Ryzen 5 8400F, with its 4.20 GHz base and 4.70 GHz boost clocks, is less of a factor at 4K. The 20.1 Gbps effective memory speed on the GPU and 644.6 GB/s bandwidth are more critical at higher resolutions. The FPS drop from 1080p to 4K is largest at Low settings (124.4 FPS), which indicates that even at low graphical loads, the GPU’s fill rate becomes a limiting factor before the CPU’s single-thread performance of 2943 in Cinebench R23 can compensate.

Measured FPS Breakdown

At 1920x1080, the RX 9070 XT shows its strength. Low settings hit 216.7 FPS, which is the highest measured value in the entire dataset. Medium drops to 147.5 FPS, still well above refresh-rate thresholds. High produces 128.2 FPS, and Ultra bottoms out at 97 FPS. The spread from Low to Ultra is 119.7 FPS, indicating that the GPU has significant headroom at this resolution.

At 2560x1440, the performance tiers compress. Low delivers 156.9 FPS, Medium 101.6 FPS, High 85.5 FPS, and Ultra 64 FPS. The gap between Low and Ultra narrows to 92.9 FPS. The High preset at 1440p is 42.7 FPS slower than at 1080p, showing the GPU’s workload increases substantially with pixel count.

At 3840x2160, the data shows the hardest hits. Low remains playable at 92.3 FPS, but Medium falls to 61.6 FPS, High to 51 FPS, and Ultra to 36.6 FPS. The 4K Ultra result is the only measured row below 40 FPS. The step from Medium to High at 4K costs 10.6 FPS, while High to Ultra costs 14.4 FPS, showing that each preset increment has a diminishing return.

How This Combo Ranks

The combo ranks 422nd out of 1717 tested combinations in Rust, placing it in the top 25% of all tested systems. This percentile position is notable given the hardware’s specifications. The Ryzen 5 8400F sits at the 82nd percentile among all CPUs, and the RX 9070 XT also sits at the 82nd percentile among all GPUs, suggesting a balanced pairing. However, the rank of 422 indicates that many other combos outperform this one in Rust specifically, likely due to the game’s sensitivity to CPU single-thread performance.

The CPU’s nearest rivals provide context. The Ryzen 7 2700X has a deltaPct of 0, meaning the 8400F performs identically in synthetic benchmarks. The Ryzen 5 7500F is 0.3% faster, while the Ryzen AI 5 PRO 340 is 0.1% slower. These tiny margins suggest the 8400F is not a bottleneck in most scenarios. The GPU’s rivals, such as the Radeon RX Vega 64 at -0.6% delta, are older but comparable in average score. The 9070 XT’s 48.66 TFLOPS FP32 performance is far ahead of Vega 64, yet the rank of 422 implies Rust’s optimization may favor other architectures.

The rank in the top quartile means this combo outperforms 1295 other tested combinations. The data shows that while the hardware is solid, it is not exceptional for Rust, where 4K Ultra results are poor relative to other games. The 422nd place suggests that users seeking top-tier Rust performance may need to consider different hardware, but for 1080p and 1440p gaming, this combo is well within the top tier of measured results.

CPU Role

The Ryzen 5 8400F is a 6-core, 12-thread processor based on Zen 4 architecture, fabricated on a 4 nm process from TSMC. Its base clock of 4.20 GHz and boost clock of 4.70 GHz provide solid single-thread performance, as evidenced by its Cinebench R23 single-core score of 2943. In Rust, which is known for its CPU-intensive simulation and physics, this processor’s 16 MB of L3 cache and 83.2 GB/s memory bandwidth are crucial for maintaining frame pacing.

The benchmark data shows the CPU’s multi-threaded capability is moderate. Its Cinebench R23 multi-core score of 20851 places it in the 82nd percentile, but its nearest rival, the Ryzen 7 2700X, matches its average benchmark score of 25064. This suggests that Rust may not fully utilize all 12 threads, as the game’s engine often relies on a few heavily loaded threads. The 3DMark single-thread score of 951 indicates that the CPU’s per-core performance is adequate but not exceptional.

At 1080p Low, the 216.7 FPS result likely approaches the CPU’s limit, as the GPU is not fully stressed. The 4.70 GHz boost clock helps maintain high frame rates, but the data implies that a faster CPU could push even higher. At 4K Ultra, the CPU’s role diminishes, as the GPU becomes the clear bottleneck. The 65W TDP and dual-channel DDR5 memory support (83.2 GB/s) are sufficient for Rust’s requirements, but the 16 MB L3 cache may cause occasional stutters in large multiplayer servers with many entities.

GPU Role

The AMD Radeon RX 9070 XT is a RDNA 4.0 architecture GPU with 4096 shading units, 256 TMUs, and 128 ROPs. Its boost clock of 2970 MHz and game clock of 2400 MHz deliver substantial compute throughput, with FP32 performance rated at 48.66 TFLOPS. The 16 GB of GDDR6 memory on a 256-bit bus provides 644.6 GB/s of bandwidth, which is critical for Rust’s large texture and asset streaming.

The GPU’s 82nd percentile ranking among all GPUs is consistent with its measured performance. The 3DMark Steel Nomad DX12 score of 7260 indicates strong DirectX 12 performance, which Rust uses. The passmark G3D score of 26795 places it well above average, but its nearest rivals, such as the Radeon RX Vega 64 with a -0.6% delta, are significantly older architectures. This suggests that the RX 9070 XT’s raw performance is high, but Rust’s optimization may not fully leverage RDNA 4.0’s new features.

The 4K results highlight the GPU’s limitations. At 4K Ultra, the 36.6 FPS average is a direct consequence of the 128 ROPs being unable to fill 8.3 million pixels per frame at the required rate. The 380.2 GPixel/s pixel rate is insufficient for Ultra settings at 4K. At 1080p, the GPU has ample headroom, as shown by the 216.7 FPS at Low settings. The 16 GB VRAM is never a bottleneck in these measurements, as Rust’s memory usage at 4K Ultra likely stays below this capacity. The 304W TDP and dual-slot design are consistent with the performance delivered, but the data shows that the GPU’s compute power is best utilized at 1440p and below.