Rust

Rust’s measured frame rates with the AMD Ryzen 9 9900X3D and Intel Arc B390 combination reveal a system that is overwhelmingly constrained by its graphics solution. The data shows a clear pattern where the GPU becomes the bottleneck at nearly every resolution and settings level, with the CPU’s substantial multi-threading capabilities rarely being pushed to their limits.

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

The frame rate scaling across resolutions tells a stark story about where the performance ceiling lies. At 1920x1080 with Low settings, the combo achieves 76 FPS, which drops to 53 FPS at 2560x1440 and further to 31 FPS at 3840x2160. This represents a 30% reduction from 1080p to 1440p, and another 42% drop from 1440p to 4K. The scaling is not linear; the steep decline indicates that the Intel Arc B390 is running out of pixel processing capability as the resolution increases.

Looking at High settings, the pattern continues but with lower absolute numbers. The 1080p result of 43 FPS falls to 30 FPS at 1440p and 18 FPS at 4K. The percentage drops are similar to Low settings, confirming that resolution scaling is independent of the quality preset. This consistency suggests the limiting factor is raw throughput rather than memory bandwidth or texture processing, as those would typically show different scaling characteristics across settings.

The Medium settings row provides additional insight through its min and max FPS values. At 1080p, the range spans from 44 FPS to 59 FPS, while at 1440p it narrows to 30-41 FPS, and at 4K it tightens to 18-24 FPS. The shrinking range at higher resolutions indicates that the GPU is becoming fully saturated, leaving less variance in frame times. When a component is completely maxed out, frame pacing becomes more consistent even as average performance degrades.

This resolution scaling behavior points directly to the GPU as the primary limiter. The Ryzen 9 9900X3D, with its 12 cores and 24 threads, is far more capable than what these frame rates suggest. If the CPU were the bottleneck, we would expect to see less dramatic drops when moving to higher resolutions, because the CPU workload per frame does not increase proportionally with pixel count. The data shows the opposite, confirming the Intel Arc B390’s position as the constraining element in this pairing.

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

The Intel Arc B390 operates with system-shared memory, meaning it has no dedicated VRAM pool. This architecture has profound implications for Rust’s performance. Rust is known for its large world persistence and frequent asset streaming, which typically demands significant video memory. With system-shared memory, the GPU must compete with the CPU for memory bandwidth, and the "System Dependent" bandwidth figure indicates that performance can vary based on the platform’s memory configuration.

The GPU’s clock behavior shows a base of 300 MHz and a boost of 2500 MHz. The wide gap between these figures suggests the card can scale its frequency aggressively when thermal and power headroom allow, but the 80 W TDP imposes a strict power envelope. In a demanding survival game like Rust, where large bases and dense environments create sustained load, the GPU likely cannot maintain its boost clock for extended periods. This would explain why the measured FPS numbers are relatively modest even at 1080p Low.

The Arc B390’s specifications reveal its integrated-class positioning. With 1536 shading units, 48 TMUs, and 24 ROPs, the pixel rate is rated at 60.00 GPixel/s and texture rate at 120.0 GTexel/s. These figures translate directly to the 4K performance seen in the data: 13 FPS at Ultra and 18 FPS at High. The 24 ROPs are particularly limiting for 4K output, as each pixel must pass through the render output pipeline regardless of the game’s internal settings.

The GPU’s percentile ranking of 9th against all GPUs underscores its low-end positioning. Its nearest rivals include the NVIDIA GeForce GT 520MX and GT 710, with the Arc B390 scoring 2.7% higher than the GT 710 in the 3DMark Steel Nomad DX12 test. This benchmark score of 1482, which is also the GPU’s average benchmark score, places it in a performance tier that is fundamentally unsuited for modern survival games at high resolutions.

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

Given the measured data, the Low preset delivers the only playable experience at 1080p, with an average of 76 FPS. This is the sole configuration that exceeds the 60 FPS threshold commonly associated with smooth gameplay. The Medium preset at 1080p produces 51 FPS, which may be acceptable for some players but does not provide the headroom needed for consistent frame pacing in Rust’s unpredictable multiplayer environments.

At 1440p, the Low preset yields 53 FPS, which is borderline playable but with no margin for demanding scenes. The High preset at 30 FPS and Ultra at 23 FPS are not viable for action-oriented gameplay, as these frame rates would result in noticeable input lag and visual stuttering. The 4K results are uniformly poor, with the best option being Low at 31 FPS, which still falls short of the minimum threshold for a responsive experience.

The Medium preset’s measured FPS ranges provide useful guidance. At 1080p, the 44-59 FPS range shows that even this middle ground has occasional drops below 45 FPS, which would be noticeable during combat or when loading new areas. The 1440p Medium range of 30-41 FPS is consistently below playable levels. Based on the data, the optimal configuration is 1080p Low, as it is the only setting combination that provides both acceptable average performance and sufficient headroom above critical low-FPS thresholds.

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

At 3840x2160, the measured average frame rates are as follows: Low preset produces 31 FPS, Medium produces 21 FPS with a range of 18-24 FPS, High produces 18 FPS, and Ultra produces 13 FPS. The progression from Low to Ultra shows a steady decline of roughly 10 FPS per settings tier, with the gap between Low and Medium being the largest single drop at 10 FPS.

Moving to 2560x1440, the numbers improve substantially. Low preset achieves 53 FPS, Medium achieves 35 FPS with a range of 30-41 FPS, High achieves 30 FPS, and Ultra achieves 23 FPS. The relative spacing between settings is similar to 4K, but the absolute values are approximately 70% higher across the board. This suggests that the GPU’s fill rate limitations are the primary constraint, as the 1.78x increase in pixel count from 1440p to 4K results in roughly a 40% reduction in frame rates.

At 1920x1080, the performance becomes more usable. Low preset reaches 76 FPS, Medium achieves 51 FPS with a range of 44-59 FPS, High achieves 43 FPS, and Ultra achieves 33 FPS. The jump from 1440p to 1080p provides another 44% improvement on average, following the same pattern of diminishing returns as resolution decreases. The data shows that the gap between Medium and High is only 8 FPS at 1080p, while the gap between Low and Medium is 25 FPS, indicating that the Low to Medium transition carries the most significant performance cost.

FAQ — 4-6 Q&A pairs answerable from FACT PACK data

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

A: The 1920x1080 Low preset delivers the highest average FPS at 76, making it the only configuration that exceeds 60 FPS. All 1440p and 4K options fall below 53 FPS, with 4K Ultra dropping to just 13 FPS.

Q: How does the Intel Arc B390 compare to its closest GPU rivals?

A: The Arc B390 scores 1482 in 3DMark Steel Nomad DX12, which is 2.7% higher than the NVIDIA GeForce GT 710 (1443), 1.5% higher than the GeForce 800M (1460), and 1.3% higher than the GeForce GT 520MX (1463). This places it in the bottom 9th percentile of all GPUs.

Q: Does increasing the resolution have a proportional impact on frame rate?

A: No. Moving from 1080p to 1440p at Low settings reduces FPS from 76 to 53 (a 30% drop), while moving from 1440p to 4K reduces it from 53 to 31 (a 42% drop). The non-linear decline indicates the GPU becomes increasingly saturated at higher pixel counts.

Q: What is the frame time consistency like at Medium settings?

A: The Medium preset shows a range of 44-59 FPS at 1080p, 30-41 FPS at 1440p, and 18-24 FPS at 4K. The range narrows as resolution increases, suggesting the GPU becomes more consistently bottlenecked rather than experiencing variable load.

Q: How does the CPU’s benchmark performance compare to its nearest rivals?

A: The Ryzen 9 9900X3D has an average benchmark score of 54762, which is 0.6% lower than the Intel Core Ultra 5 245KF (55093), 1.3% higher than the Intel Core Ultra 5 245K (54053), 2% higher than the Intel Xeon 6505P (53701), and 2.1% higher than the Intel Core i7-14700F (53620).

Q: Is this system capable of running Rust at 4K?

A: Technically yes, but not playably. The best 4K result is 31 FPS at Low settings, with Ultra dropping to 13 FPS. These frame rates are below the threshold needed for responsive gameplay in a competitive survival title.

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

The AMD Ryzen 9 9900X3D brings substantial processing power to this pairing, with 12 cores and 24 threads based on the Zen 5 architecture. Its base clock of 4.40 GHz and boost clock of 5.50 GHz provide high single-thread performance, which is crucial for Rust’s physics calculations and entity updates. The 128 MB of L3 cache is particularly relevant for a survival game where world data and player inventories are frequently accessed.

The CPU’s benchmark results demonstrate its capability. In Cinebench R23, it scores 47737 in multicore and 6739 in single-core, while Geekbench shows 22884 multicore and 3041 single-core. These scores place the CPU in the 91st percentile of all processors, with an average benchmark score of 54762. However, the measured FPS in Rust does not reflect this processing power, as the GPU becomes the limiting factor before the CPU can be fully utilized.

The data indicates that the CPU is not the bottleneck in this configuration. At 1080p Low, where CPU load is typically highest relative to GPU load, the system achieves 76 FPS. If the CPU were limiting, we would expect to see frame rates plateau at a certain level regardless of resolution. Instead, the FPS continues to drop with increasing resolution, confirming that the Arc B390 is the constraining component. The CPU’s 3DMark scores — 12490 for 16 threads, 13795 for max threads, and 1269 for single-thread — all indicate headroom that remains unused in this game scenario.

The CPU’s memory bandwidth of 89.6 GB/s and dual-channel DDR5 support provide adequate bandwidth for the system-shared GPU memory. However, the "System Dependent" nature of the GPU’s memory bandwidth means that even this capable CPU cannot overcome the fundamental limitations of the integrated graphics solution.

How This Combo Ranks — use comboRankInGame vs other tested combos

This specific combination of AMD Ryzen 9 9900X3D and Intel Arc B390 ranks 2601 out of 2953 tested combos in Rust. This places it in the bottom 12% of all tested configurations, which is a remarkably low position given the CPU’s high-end specifications. The rank reflects the severe imbalance between the processor’s capability and the graphics solution’s limitations.

The ranking becomes more meaningful when considering the CPU’s percentile of 91 versus the GPU’s percentile of 9. This 82-point gap between component tiers is one of the most extreme mismatches possible, and the Rust results directly reflect this. The combo rank of 2601 indicates that most other tested pairings, even those with significantly weaker CPUs, outperform this combination because they pair those CPUs with more capable GPUs.

The data suggests that the Ryzen 9 9900X3D is being wasted in this configuration, as the Arc B390 cannot translate the CPU’s processing power into playable frame rates. In games where GPU load is lighter, this CPU could potentially shine, but Rust’s demanding graphics pipeline means the GPU is the sole determinant of performance. The combo’s ranking of 2601 out of 2953 serves as a clear indicator that this pairing is not optimized for Rust, and users would need to either reduce resolution drastically or upgrade the GPU to achieve acceptable performance.