Rust

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

The measured data for Rust on this AMD Ryzen 5 5500X3D plus AMD Radeon RX 6650 XT combination reveals a clear and consistent scaling pattern as resolution increases. At the Low preset, the average frame rate drops from 143 FPS at 1920x1080 to 98 FPS at 2560x1440, then further to 58 FPS at 3840x2160. That represents a 39.9% reduction moving from 1080p to 1440p, and a 59.4% reduction from 1440p to 4K. The total scaling from 1080p Low to 4K Low is a 59.4% drop, which is substantial but not catastrophic.

At the High preset, the trajectory is steeper in relative terms. The average FPS falls from 81 at 1080p to 56 at 1440p (a 30.9% reduction), then to 33 at 4K (a 41.1% reduction from 1440p). The cumulative drop from 1080p High to 4K High is 59.3%, nearly identical to the Low preset's total scaling. This consistency across presets suggests that the limiting component scales predictably with pixel count.

The Medium preset shows intermediate behavior: 96 FPS at 1080p, 66 FPS at 1440p, and 39 FPS at 4K. The step from 1080p to 1440p is a 31.3% reduction, while 1440p to 4K is a 40.9% reduction. The Ultra preset is the most demanding, with 62 FPS at 1080p, 42 FPS at 1440p, and 25 FPS at 4K — reductions of 32.3% and 40.5% respectively.

The pattern here is informative. Across all four presets, the percentage drop from 1440p to 4K (roughly 40-41%) is consistently larger than the drop from 1080p to 1440p (roughly 31-32%). This non-linear scaling is typical of a GPU-bound scenario at higher resolutions, where the increased pixel workload — 4K has 2.25 times the pixels of 1440p, and 4 times the pixels of 1080p — begins to saturate the render pipeline. The fact that the Low preset still loses 59.4% of its frame rate going from 1080p to 4K indicates that even at minimal settings, the GPU is the primary constraint at 4K.

At 1080p, the picture changes. The Low preset's 143 FPS versus the Ultra preset's 62 FPS shows a 56.6% spread, suggesting that at lower resolutions, the CPU's single-thread performance and the game's engine overhead play a larger role. The Ryzen 5 5500X3D's 6 cores and 12 threads, with a 3.00 GHz base and 4.00 GHz boost clock, are sufficient to maintain high frame rates at 1080p Low, but the GPU's 8 GB of VRAM and 128-bit memory bus become the bottleneck as resolution climbs.

The data indicates a dual-phase limiting behavior: CPU-bound at 1080p Low (143 FPS is respectable but not exceptional for a modern 6-core CPU), transitioning to GPU-bound at 1440p and fully GPU-bound at 4K. The 4K Ultra result of 25 FPS is unplayable, while 4K Low at 58 FPS is borderline. The sweet spot for this combination appears to be 1440p High at 56 FPS, which balances visual quality with playability.

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

The AMD Ryzen 5 5500X3D is a 6-core, 12-thread processor built on the Zen 3 architecture with the Vermeer codename. Its 3.00 GHz base clock and 4.00 GHz boost clock are modest by modern standards, but the chip compensates with a large 96 MB shared L3 cache. This cache configuration is particularly relevant for Rust, a game known for its heavy procedural generation and complex entity interactions that benefit from fast access to frequently used data.

In the Passmark benchmark suite, the CPU scores 2941 in single-thread performance and 20363 in multithreaded performance. The single-thread score places it in the 85th percentile among all CPUs, which is respectable for a mid-range part. The multithreaded score of 20363 is supported by the 6 cores and 12 threads, with the integer math test scoring 60033 and floating-point math at 34511. The physics test, which often correlates with gaming performance, scores 2282.

The nearest rivals in the benchmark database paint a picture of tight competition. The AMD Ryzen 5 5600F scores 36945 in average benchmark score, a mere 0.2% above the 5500X3D's 37018. The AMD Ryzen AI 7 PRO 450 scores 37093, which is 0.2% below. The Intel Core Ultra 5 225 scores 36938 (0.2% above), and the Intel Core i9-12900T scores 37112 (0.3% below). These deltas are all within a fraction of a percent, indicating that the 5500X3D is positioned squarely in a competitive cluster of mid-range CPUs.

For Rust specifically, the CPU's role is most evident at 1080p. The Low preset at 1080p achieves 143 FPS, which is the highest measured result across all configurations. This suggests that the CPU's 6 cores and 12 threads, combined with the 96 MB L3 cache, are capable of feeding the GPU adequately at lower resolutions. The single-thread score of 2941 indicates that the game's main thread is well-served, as Rust typically runs on one or two primary threads for simulation and networking.

However, the CPU's limitations become apparent when comparing presets at 1080p. The difference between Low (143 FPS) and Ultra (62 FPS) is 81 FPS, a 56.6% reduction. This gap is larger than what would be expected from GPU scaling alone, suggesting that the CPU's memory bandwidth (51.2 GB/s on dual-channel DDR4) and the game's engine overhead are constraining performance at higher settings. The 7 nm process node and 74 mm² die size are efficient, but the 105 W TDP indicates a power-hungry design for a 6-core part.

The data shows that at 1440p and 4K, the CPU's influence diminishes. The 1440p Low result of 98 FPS is 68.5% of the 1080p Low result, and the 4K Low result of 58 FPS is 40.6% of the 1080p Low result. These ratios are consistent with GPU-bound scaling, meaning the CPU is no longer the limiting factor at higher resolutions. The CPU's Passmark data compression score of 230392 and encryption score of 13967 are strong, but these are not directly relevant to gaming performance.

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

The AMD Radeon RX 6650 XT is built on the RDNA 2.0 architecture with the Navi 23 chip, manufactured on a 7 nm process at TSMC. It features 8 GB of GDDR6 memory on a 128-bit bus, providing 280.3 GB/s of bandwidth. The GPU's base clock is 2055 MHz, with a boost clock of 2635 MHz and a game clock of 2410 MHz. The memory operates at 2190 MHz, or 17.5 Gbps effective.

The GPU's 2048 shading units, 128 texture mapping units, and 64 render output units are modest for a card in this class. The pixel rate is 168.6 GPixel/s, and the texture rate is 337.3 GTexel/s. The FP32 performance of 10.79 TFLOPS and FP16 of 21.59 TFLOPS (2:1 ratio) place it in the mid-range segment. The 32 ray tracing cores are present but are not a significant factor for Rust, which does not heavily utilize ray tracing.

In the benchmark database, the RX 6650 XT scores 17166 in Passmark G3D and 7532 in GPU compute. Its average benchmark score of 19765 places it in the 65th percentile among all GPUs. The nearest rivals are professional workstation cards: the NVIDIA Tesla K40m scores 19885 (0.6% below), the AMD FirePro D300 scores 19637 (0.7% above), the AMD FirePro W7000 scores 19905 (0.7% below), and the NVIDIA Quadro K5200 scores 19602 (0.8% above). These deltas are all within 1%, indicating that the RX 6650 XT's gaming-oriented design does not massively outperform or underperform these professional cards in raw compute.

For Rust, the GPU's role is most clearly demonstrated by the 4K results. At 4K Low, the card achieves 58 FPS, which is playable but not smooth. At 4K Medium, it drops to 39 FPS, and at 4K High, to 33 FPS. The 4K Ultra result of 25 FPS is below the threshold for comfortable gameplay. The 8 GB VRAM is likely a limiting factor at 4K, as Rust's textures and world data can consume significant memory. The 128-bit memory bus, while providing 280.3 GB/s, is narrower than higher-end cards, which affects bandwidth-intensive scenarios.

At 1440p, the GPU performs more comfortably. The High preset achieves 56 FPS, Medium 66 FPS, and Low 98 FPS. The Ultra preset at 42 FPS is playable but not ideal. At 1080p, the GPU is less stressed: High achieves 81 FPS, Medium 96 FPS, and Low 143 FPS. The Ultra preset at 62 FPS is the lowest 1080p result, indicating that the GPU's shading units and texture units are fully utilized at this setting.

The scaling from 1080p to 1440p to 4K shows a clear GPU-bound trend. The 4K Medium result of 39 FPS with a min FPS of 33 and max FPS of 45 shows some variance, but the overall pattern is consistent. The GPU's 176 W TDP and suggested 450 W PSU are reasonable for a card of this class, and the PCIe 4.0 x8 interface is sufficient for the bandwidth requirements.

FAQ

Q: What is the highest average frame rate this combo achieves in Rust, and at what settings?

A: The highest measured average is 143 FPS at 1920x1080 with the Low preset. The next highest is 98 FPS at 2560x1440 Low, followed by 96 FPS at 1920x1080 Medium.

Q: Is 4K gaming viable with this CPU and GPU combination?

A: At 4K, the Low preset achieves 58 FPS average, which is playable. However, the Medium preset drops to 39 FPS, High to 33 FPS, and Ultra to 25 FPS. The data suggests 4K is only viable at Low settings for this combo.

Q: How does the Ryzen 5 5500X3D compare to its nearest CPU rivals in benchmark scores?

A: The 5500X3D's average benchmark score is 37018. The AMD Ryzen 5 5600F scores 36945 (0.2% higher), the AMD Ryzen AI 7 PRO 450 scores 37093 (0.2% lower), the Intel Core Ultra 5 225 scores 36938 (0.2% higher), and the Intel Core i9-12900T scores 37112 (0.3% lower). All rivals are within 0.3% of each other.

Q: What is the GPU's benchmark percentile, and how does it compare to its nearest rivals?

A: The RX 6650 XT is in the 65th percentile among all GPUs with an average benchmark score of 19765. Its nearest rivals are the NVIDIA Tesla K40m (19885, 0.6% lower), AMD FirePro D300 (19637, 0.7% higher), AMD FirePro W7000 (19905, 0.7% lower), and NVIDIA Quadro K5200 (19602, 0.8% higher).

Q: Does the CPU or GPU become the bottleneck at different resolutions?

A: At 1080p, the CPU's role is more significant, as evidenced by the 143 FPS at Low versus 62 FPS at Ultra. At 1440p and 4K, the GPU becomes the limiting factor, with the 4K Low result of 58 FPS being only 40.6% of the 1080p Low result.

Q: What is the combo's rank among tested configurations in this game?

A: This combination ranks 1897 out of 2953 tested combos in Rust, placing it in the lower-middle portion of the database.

How This Combo Ranks

The combination of the AMD Ryzen 5 5500X3D and AMD Radeon RX 6650 XT ranks 1897 out of 2953 tested combos in Rust. This places it in the 64.2nd percentile of all tested configurations — meaning roughly 64% of tested combos perform better, and 36% perform worse. Given the CPU's 85th percentile ranking among all CPUs and the GPU's 65th percentile among all GPUs, the combo's overall rank is dragged down by the GPU's more modest positioning.

The rank discrepancy is telling. The CPU is a strong performer in its class, with a single-thread score of 2941 and a multithread score of 20363, both of which are competitive. The GPU, however, is only in the 65th percentile, and its nearest rivals are professional workstation cards rather than gaming-focused GPUs. This suggests that in Rust, the GPU's 8 GB VRAM and 128-bit memory bus are the limiting factors preventing higher performance.

Within the 2953 combos, a rank of 1897 means this configuration is not among the top performers, but it is also not at the bottom. The measured FPS data supports this: at 1080p Low, the combo achieves 143 FPS, which is smooth for most players. At 1440p High, 56 FPS is playable. The 4K results are the weakest point, with only the Low preset being borderline playable.

The combination's rank is likely influenced by the fact that Rust is a CPU-intensive game in certain scenarios, and the 5500X3D's 6 cores and 96 MB L3 cache are well-suited for this. However, the GPU's limitations at higher resolutions cap the overall performance. For players targeting 1080p or 1440p, this combo is adequate; for 4K, it falls short.

Measured FPS Breakdown

The measured FPS data covers four resolutions and four settings presets, with average FPS reported for all configurations and min/max FPS for the Medium preset at each resolution.

At 1920x1080, the Low preset delivers 143 FPS average, which is the highest result in the entire dataset. The Medium preset averages 96 FPS, with a minimum of 82 FPS and a maximum of 110 FPS. The High preset averages 81 FPS, and the Ultra preset averages 62 FPS. The spread from Low to Ultra is 81 FPS, indicating a significant performance cost for higher visual quality at this resolution.

At 2560x1440, the Low preset averages 98 FPS, a 31.5% reduction from 1080p Low. The Medium preset averages 66 FPS, with a minimum of 56 FPS and a maximum of 76 FPS. The High preset averages 56 FPS, and the Ultra preset averages 42 FPS. The spread from Low to Ultra is 56 FPS, which is smaller in absolute terms than at 1080p but similar in percentage (57.1%).

At 3840x2160, the Low preset averages 58 FPS, a 40.8% reduction from 1440p Low. The Medium preset averages 39 FPS, with a minimum of 33 FPS and a maximum of 45 FPS. The High preset averages 33 FPS, and the Ultra preset averages 25 FPS. The spread from Low to Ultra is 33 FPS, which is the smallest absolute spread but the largest percentage reduction (56.9%).

The Medium preset at each resolution provides the only min/max data points. At 1080p, the min is 82 and the max is 110, giving a 28 FPS variance. At 1440p, the min is 56 and the max is 76, a 20 FPS variance. At 4K, the min is 33 and the max is 45, a 12 FPS variance. This narrowing variance at higher resolutions is consistent with GPU-bound behavior, where frame times become more consistent as the GPU becomes the bottleneck.

Settings Recommendations

Based on the measured FPS data, the optimal settings depend on the target resolution and desired frame rate.

For 1080p gameplay, the Low preset at 143 FPS is the smoothest experience, ideal for competitive play or high-refresh-rate monitors. However, the Medium preset at 96 FPS offers a better balance between visual quality and performance, with the min FPS of 82 still providing a playable experience. The High preset at 81 FPS is also viable, and the Ultra preset at 62 FPS is acceptable for players who prioritize visuals over frame rate. The data suggests that 1080p Medium or High is the sweet spot, as the jump from Medium to Ultra costs 34 FPS (35.4%) for marginal visual gains.

For 1440p gameplay, the Low preset at 98 FPS is the only option that comfortably exceeds 60 FPS. The Medium preset at 66 FPS is playable, with the min FPS of 56 staying above the 50 FPS threshold. The High preset at 56 FPS is borderline, and the Ultra preset at 42 FPS is not recommended for smooth gameplay. The recommended setting is Medium, which provides acceptable visual quality while maintaining a frame rate that dips only slightly below 60 FPS.

For 4K gameplay, the options are severely limited. The Low preset at 58 FPS is the only playable setting, and even then, it is close to the 60 FPS threshold. The Medium preset at 39 FPS is not recommended for most players, and the High and Ultra presets at 33 and 25 FPS respectively are unplayable. If 4K is the target, the Low preset is the only viable choice, and players should be prepared for a visually sparse experience.

The data indicates that this combination is best suited for 1080p and 1440p gaming. At 1080p, Medium or High settings provide a good balance. At 1440p, Medium is the recommended setting, as it delivers 66 FPS average with a min of 56 FPS. The 4K Low preset at 58 FPS is the only playable 4K option, making 4K gaming a marginal use case for this hardware. For the best overall experience, 1440p Medium offers the highest resolution with acceptable visual quality and frame rates.