Rust

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

The measured FPS data for Rust with the AMD Ryzen 7 5800X3D and AMD Radeon RX 7900 XT reveals a clear pattern of scaling as resolution increases. At 1080p Low, the combo delivers 190 FPS average; moving to 1440p Low drops that to 167 FPS, and at 4K Low it falls to 99 FPS. This represents a 48% reduction from 1080p to 4K at Low settings, indicating that the GPU becomes progressively more stressed as pixel count rises.

The High settings row tells a similar story: 137 FPS at 1080p, 95 FPS at 1440p, and 56 FPS at 4K. That's a 59% decline from 1080p to 4K. Medium settings show 163 FPS at 1080p, 112 FPS at 1440p, and 66 FPS at 4K. Ultra settings, the most demanding preset, produce 105 FPS at 1080p, 72 FPS at 1440p, and just 42 FPS at 4K.

The scaling behavior across all settings presets is remarkably consistent. The drop from 1440p to 4K is proportionally larger than the drop from 1080p to 1440p at every settings level. For instance, at Medium settings, the decline from 1440p to 4K is 46 FPS, while the decline from 1080p to 1440p is 51 FPS. This suggests the GPU is the primary limiting factor at 4K, as the render resolution demands increase quadratically.

However, the 1080p numbers tell a different story. At Low settings, the combo reaches 190 FPS, but the gap between Low and Medium at 1080p is only 27 FPS (190 to 163). At 4K, that same Low-to-Medium gap is 33 FPS (99 to 66). The relatively smaller delta at 1080p suggests the CPU may be constraining performance at lower resolutions, where the GPU has more headroom. The Ryzen 7 5800X3D's 8 cores and 16 threads, with a boost clock of 4.50 GHz, appear sufficient to feed the GPU at 1080p, but the frame rates plateau around 190 FPS regardless of how low the settings go.

Data points to a system that is well-balanced at 1440p, where the 95-167 FPS range across settings indicates neither component is severely bottlenecked. At 4K, the GPU dominates the performance curve, as evidenced by the 42-99 FPS spread that correlates directly with pixel workload. The 20 GB VRAM buffer on the RX 7900 XT is more than adequate for Rust's texture demands at 4K, so the scaling is driven by raw compute rather than memory capacity.

FAQ

Q: What is the best resolution for this combo in Rust?

A: The data shows 1440p as the sweet spot. At High settings, the combo produces 95 FPS average, which is well above the 60 FPS threshold for smooth gameplay. At 1080p, the 137 FPS High average is excellent but the gains over 1440p are modest, suggesting diminishing returns from dropping resolution further.

Q: How much FPS does Ultra settings cost compared to High?

A: At 1080p, Ultra delivers 105 FPS versus 137 FPS on High — a 32 FPS penalty. At 1440p, the gap is 23 FPS (72 vs 95). At 4K, Ultra drops to 42 FPS versus 56 FPS on High, a 14 FPS difference. The relative cost of Ultra increases at lower resolutions, indicating a CPU-bound scenario at 1080p.

Q: Can this combo maintain 60 FPS at 4K?

A: Only at Low settings, where the average is 99 FPS. Medium settings produce 66 FPS average with a minimum of 56 FPS, which dips below the 60 FPS line. High and Ultra settings average 56 FPS and 42 FPS respectively, so 4K High is not viable for 60 FPS gameplay.

Q: How does the combo rank among all tested configurations in Rust?

A: The combo ranks 734th out of 3,723 tested combos, placing it in the top 20% of all configurations. This percentile performance aligns with the strong 1080p and 1440p results, while the 4K numbers are more modest.

Q: What is the minimum FPS observed in the measured data?

A: The only minimum FPS values recorded are at Medium settings: 138 FPS at 1080p, 95 FPS at 1440p, and 56 FPS at 4K. These minima are close to the averages, suggesting stable frame pacing rather than severe stuttering.

Q: Is the CPU or GPU more important for Rust with this setup?

A: The data indicates the GPU dominates at 4K, where scaling is steep. At 1080p, the CPU's 8 cores and 16 threads appear sufficient, as even Low settings only reach 190 FPS. The 96 MB L3 cache on the 5800X3D likely helps with Rust's single-threaded simulation logic, but the render load scales with resolution.

Settings Recommendations

The measured data provides three clear tiers for settings selection. For 4K displays, Low settings deliver 99 FPS average, which is the only preset that comfortably exceeds 60 FPS. Medium at 4K averages 66 FPS but has a minimum of 56 FPS, meaning occasional dips below 60 FPS. High at 4K drops to 56 FPS average, which is borderline for competitive play. Ultra at 4K is effectively unplayable at 42 FPS.

For 1440p, High settings offer the best balance: 95 FPS average with no recorded minimum below 60 FPS. Medium at 1440p provides 112 FPS, which is smoother but the visual quality difference between Medium and High is substantial in Rust's detailed environments. Low at 1440p reaches 167 FPS, which is overkill for most displays. Ultra at 1440p at 72 FPS is playable, but the 23 FPS penalty versus High is significant.

At 1080p, High settings are the recommended choice at 137 FPS, as this exceeds 120 Hz displays while maintaining visual fidelity. Medium at 1080p produces 163 FPS with a minimum of 138 FPS, which is ideal for 144 Hz monitors. Low at 1080p hits 190 FPS, but the visual degradation is severe for marginal frame rate gains. Ultra at 1080p at 105 FPS is the only preset that drops below 120 FPS, so competitive players should avoid it.

The data suggests that Medium settings at 1080p are the most consistent experience, with a narrow 49 FPS range between minimum and maximum (138-187 FPS). This stability is valuable in Rust, where frame time consistency matters during PvP encounters.

How This Combo Ranks

The combo rank of 734 out of 3,723 tested configurations places this system in the 80th percentile of all tested combos. This top-quintile ranking is consistent with the hardware's individual benchmark percentiles: the Ryzen 7 5800X3D sits at the 80th percentile among all CPUs, while the RX 7900 XT ranks at the 55th percentile among all GPUs.

The CPU's percentile ranking is notably higher than the GPU's, which explains the performance characteristics observed in Rust. The 5800X3D's nearest rivals in average benchmark score include the AMD Ryzen 7 6800U (deltaPct 0), Intel Core i9-10900K (deltaPct 0.1), AMD Ryzen AI 5 PRO 340 (deltaPct -0.1), and Intel Core i5-12600KF (deltaPct 0.3). These fractional deltas indicate that the 5800X3D is essentially tied with these processors in general compute, but its 96 MB L3 cache may provide specific advantages in Rust's simulation-heavy gameplay.

The GPU's nearest rivals, based on average benchmark scores, include the AMD Radeon 660M (deltaPct -0.5), NVIDIA RTX A2000 Mobile (deltaPct -0.5), AMD Radeon RX 570X (deltaPct -0.9), and AMD Radeon RX 9070 XT (deltaPct 1.5). The RX 7900 XT's 55th percentile ranking is lower than its raw specifications would suggest, but this is a measure against all GPUs including integrated graphics, which skews the distribution.

The combination of a top-quintile CPU with a mid-pack GPU results in a system that ranks in the 80th percentile for Rust specifically. This suggests that Rust's performance is more sensitive to CPU capabilities than pure GPU throughput, which aligns with the game's survival genre requiring complex world simulation.

CPU Role

The AMD Ryzen 7 5800X3D brings 8 cores and 16 threads based on the Zen 3 architecture, with a base clock of 3.40 GHz and a boost clock of 4.50 GHz. The processor's defining feature is its 96 MB shared L3 cache, which is substantially larger than typical desktop processors. This cache design is particularly relevant for Rust, where the game world state and entity interactions demand rapid data access.

The CPU's benchmark results show strong multithreaded performance: Cinebench R23 multicore scores 14,317, while Geekbench multicore reaches 11,765. Single-thread performance is also respectable at 1,452 in Cinebench R23 and 2,017 in Geekbench. The 3DMark 16-thread score of 7,299 and max-thread score of 7,285 indicate near-linear scaling to 8 cores, which is beneficial for Rust's background simulation threads.

In the measured FPS data, the CPU's role becomes evident at 1080p. At Low settings, the combo achieves 190 FPS, but this appears to be a ceiling — the difference between Low and Medium at 1080p is only 27 FPS, whereas at 4K the same settings gap is 33 FPS. This compressed scaling at 1080p suggests the CPU is limiting frame rates around 190 FPS, regardless of how light the GPU workload becomes.

The 5800X3D's nearest rivals, such as the Intel Core i9-10900K with a deltaPct of 0.1, have similar average benchmark scores but lack the large L3 cache. In Rust, this cache advantage likely manifests as better minimum frame times, though the measured data only records minimums at Medium settings. The 138 FPS minimum at 1080p Medium, for instance, is close to the 163 FPS average, indicating consistent frame delivery.

The CPU's 105 W TDP and 7 nm process node suggest efficient operation, but the data does not include power measurements. The processor supports DDR4 memory with dual-channel bandwidth of 51.2 GB/s, which is adequate for Rust's memory access patterns.

Measured FPS Breakdown

The complete measured FPS dataset for this combo in Rust is as follows:

1080p:

• Low: 190 FPS average
• Medium: 163 FPS average, 138 FPS minimum, 187 FPS maximum
• High: 137 FPS average
• Ultra: 105 FPS average

1440p:

• Low: 167 FPS average
• Medium: 112 FPS average, 95 FPS minimum, 129 FPS maximum
• High: 95 FPS average
• Ultra: 72 FPS average

4K (3840x2160):

• Low: 99 FPS average
• Medium: 66 FPS average, 56 FPS minimum, 76 FPS maximum
• High: 56 FPS average
• Ultra: 42 FPS average

The Medium settings rows are the only ones with complete min/max data. At 1080p, the range from minimum to maximum is 49 FPS (138 to 187), which represents a 30% variation from the average. At 1440p, the range is 34 FPS (95 to 129), a 30% variation. At 4K, the range is 20 FPS (56 to 76), also a 30% variation. This consistent proportional spread suggests Rust's frame time variability scales with average FPS, rather than being resolution-dependent.

The settings deltas at each resolution are instructive. At 1080p, the difference between Low and Ultra is 85 FPS (190 to 105). At 1440p, it's 95 FPS (167 to 72). At 4K, it's 57 FPS (99 to 42). The 1440p delta is largest in absolute terms, indicating that both CPU and GPU have headroom to respond to settings changes at this resolution.

GPU Role

The AMD Radeon RX 7900 XT is built on the RDNA 3.0 architecture with the Navi 31 chip, manufactured on a 5 nm process by TSMC. The GPU contains 5,376 shading units, 336 texture mapping units, and 192 raster operation units, along with 84 ray tracing cores. Its compute capability is rated at 51.48 TFLOPS FP32, with a texture rate of 804.4 GTexel/s and pixel rate of 459.6 GPixel/s.

Memory configuration is substantial: 20 GB of GDDR6 on a 320-bit bus, delivering 800.0 GB/s bandwidth. The memory clock runs at 2500 MHz (20 Gbps effective), and the GPU's base clock is 1387 MHz with a boost clock of 2394 MHz. The game clock is rated at 2025 MHz. The GPU draws up to 300 W TDP and requires a 700 W suggested PSU, with dual 8-pin power connectors.

In Rust, the GPU's role is most apparent at 4K resolution. The scaling from 1080p Low to 4K Low shows a 91 FPS drop (190 to 99), which is a 48% reduction. This is consistent with the pixel count increase from approximately 2 million to 8.3 million pixels. The GPU's 20 GB VRAM is more than sufficient for Rust's texture sets at 4K Ultra, so the performance drop is due to compute throughput rather than memory capacity.

The RX 7900 XT's benchmark scores provide context: 3DMark Steel Nomad DX12 scores 5,623, Geekbench Vulkan scores 71,068, and Passmark G3D scores 29,009. The GPU's 55th percentile among all GPUs is notably lower than its raw specifications suggest, but this ranking includes integrated GPUs that pad the distribution. Its nearest rivals in average benchmark score include the AMD Radeon 660M (deltaPct -0.5) and NVIDIA RTX A2000 Mobile (deltaPct -0.5), which are significantly less powerful in real-world gaming, indicating the percentile metric may not fully capture gaming performance.

At 1080p, the GPU is not the limiting factor — the CPU caps performance around 190 FPS. At 1440p, the GPU becomes more involved, with frame rates scaling from 72 to 167 FPS across settings. At 4K, the GPU is clearly the bottleneck, as evidenced by the steep drop to 42 FPS at Ultra settings. The 800 GB/s memory bandwidth is likely sufficient for Rust's streaming textures, but the 51.48 TFLOPS compute is challenged by the game's draw calls and post-processing at high pixel counts.