Rust

# Rust with Intel Core i5-10400F + NVIDIA GeForce RTX 5090 D

The pairing of a six-core Comet Lake processor with NVIDIA's flagship Blackwell GPU creates a striking imbalance in Rust, a survival title known for its demanding simulation and rendering workloads. The measured data reveals a system where the RTX 5090 D is clearly capable of massive frame rates, but the Intel Core i5-10400F frequently acts as the ceiling, particularly at lower resolutions. At 1080p Low, the combo reaches 149 FPS, yet the same GPU at 4K Ultra drops to 61 FPS, showing a performance curve that shifts from CPU-bound to GPU-bound as resolution climbs. This analysis explores how that transition unfolds across the measured resolution and settings matrix, and what it implies for owners of this specific configuration.

Resolution Scaling

The frame rate progression from 1080p to 4K tells a clear story about where the bottleneck lives in this system. At 1080p Low, the combo produces 149 FPS, but at 1440p Low, it falls to 131 FPS, and at 4K Low, it reaches 110 FPS. The drop from 1080p to 1440p is 12.1%, while the drop from 1440p to 4K is 16.0%. These are relatively modest declines for a GPU that is being asked to render four times the pixels at 4K versus 1080p. In a purely GPU-limited scenario, the 4K frame rate would typically be far lower relative to 1080p, suggesting that the CPU is holding back performance at the lower resolutions.

The High settings tell a similar story. At 1080p High, the system delivers 121 FPS, dropping to 106 FPS at 1440p High (a 12.4% reduction), and then to 80 FPS at 4K High (a 24.5% reduction from 1440p). The larger percentage drop between 1440p and 4K indicates that the GPU is starting to become the limiting factor at higher resolutions, but the absolute numbers remain high enough that the CPU is still contributing to the ceiling. At Ultra settings, the progression is 109 FPS at 1080p, 96 FPS at 1440p, and 61 FPS at 4K. The 4K Ultra result represents a 43.9% drop from 1080p Ultra, which is the steepest decline in the entire dataset and points to the GPU finally being fully saturated.

What this scaling suggests is that the RTX 5090 D is severely underutilized at 1080p, where the i5-10400F's six cores and 12 threads are likely the primary constraint. The gap between 1080p Low (149 FPS) and 4K Low (110 FPS) is only 26.2%, which is remarkably small for such a dramatic resolution increase. This implies that even at 4K Low, the CPU is still limiting the frame rate to some degree. It is only at 4K Ultra, where the frame rate drops to 61 FPS, that the GPU's workload becomes the dominant factor. For gamers using this combo, the implication is that lower resolutions do not unlock proportionally higher frame rates because the processor cannot feed the GPU fast enough.

FAQ

Q: What is the highest average frame rate this combo achieves in Rust?

A: The highest measured average frame rate is 149 FPS at 1920x1080 with Low settings. The next highest is 131 FPS at 2560x1440 Low, showing that the processor limits gains at lower resolutions.

Q: How does the combo perform at 4K Ultra compared to 1080p Low?

A: At 4K Ultra, the average frame rate is 61 FPS, while at 1080p Low it is 149 FPS. This represents a 59.1% reduction in performance, but the absolute drop from 4K Low (110 FPS) to 4K Ultra (61 FPS) shows that settings have a larger impact at 4K than resolution scaling alone.

Q: Is the RTX 5090 D the bottleneck in this system for Rust?

A: Based on the data, the CPU is the primary bottleneck at 1080p and 1440p, as evidenced by the small frame rate differences between resolutions. At 4K Ultra, the GPU becomes the limiting factor, with the frame rate dropping to 61 FPS, which is the lowest measured result in the entire dataset.

Q: What is the combo's rank among all tested combinations in Rust?

A: The combo ranks 528th out of 2,953 tested combinations in Rust. This places it in the top 17.9% of all tested combos, which is notable given that the CPU is a mid-range 10th-generation part paired with a flagship GPU.

Q: How does the CPU's single-thread performance compare to its multi-thread performance?

A: The i5-10400F scores 688 in 3dmark_single_thread and 4,748 in 3dmark_16_threads. The multi-thread score is 6.9 times higher than the single-thread score, which is consistent with a 6-core/12-thread processor, but the single-thread score itself is modest compared to modern CPUs.

Q: Does the GPU's 32 GB of VRAM make a difference in Rust at these settings?

A: The RTX 5090 D has 32 GB of GDDR7 memory with a 512-bit bus and 1.79 TB/s bandwidth. While Rust can be memory-intensive, the measured frame rates do not show any memory-related stuttering or the min FPS data (available for Medium settings) indicates consistent frame times, suggesting VRAM capacity is not a limiting factor in this title.

How This Combo Ranks

The combination of the Intel Core i5-10400F and NVIDIA GeForce RTX 5090 D achieves a rank of 528 out of 2,953 tested combos in Rust. This places it in the 82.1st percentile of all tested configurations, meaning it outperforms roughly 82% of all other CPU-GPU pairings tested in this game. This is a strong result, but it is worth questioning whether the ranking reflects the GPU's potential or the CPU's limitation.

The i5-10400F sits at the 68th percentile among all CPUs in the benchmark database, with an average benchmark score of 14,185. Its nearest rivals include the Intel Xeon 6756E (0.2% faster), the Intel Core 7 160UL (0.3% slower), and the AMD EPYC 7552 (0.5% faster). These are all enterprise or low-power parts, which suggests the i5-10400F is competitive with a wide range of processors in synthetic tests. However, in Rust's specific workload, the CPU's six cores and 12 threads may not be enough to fully drive the RTX 5090 D.

The GPU, in contrast, is at the 92nd percentile among all GPUs, with an average benchmark score of 77,712. Its nearest rivals are the AMD Radeon RX 6650M XT (1.1% faster) and the AMD Radeon RX 6850M XT (1.6% slower), which are both mobile parts. This is unusual — the RTX 5090 D is being compared to laptop GPUs in the database's nearestRivals list, which suggests that the benchmarking methodology may be producing anomalous results for this particular card. Regardless, the GPU's percentile ranking is far higher than the CPU's, reinforcing the idea that the processor is the weaker link in this pairing.

The 528th rank out of 2,953 combos means there are 527 other combinations that perform better in Rust. Given that the RTX 5090 D is one of the most powerful GPUs available, it is likely that most of those higher-ranked combos feature more capable processors. The data implies that upgrading the CPU would yield significant gains, particularly at 1080p and 1440p where the GPU is waiting on the processor.

Measured FPS Breakdown

At 1920x1080, the combo delivers its highest frame rates across all settings. Low settings produce an average of 149 FPS, which is the best result in the entire dataset. Medium settings yield 128 FPS with a minimum of 109 FPS and a maximum of 147 FPS, showing a tight frame time distribution. High settings reduce the average to 121 FPS, while Ultra settings bring it down to 109 FPS. The spread from Low to Ultra at 1080p is 40 FPS, or 26.8%, which is substantial but not as large as the spread at higher resolutions.

At 2560x1440, the performance drops are noticeable but not dramatic. Low settings average 131 FPS, which is 12.1% lower than the 1080p Low result. Medium settings average 113 FPS with a minimum of 96 FPS and a maximum of 130 FPS, maintaining a similar frame time consistency to the 1080p Medium result. High settings average 106 FPS, and Ultra settings average 96 FPS. The Low-to-Ultra spread at 1440p is 35 FPS, or 26.7%, which is nearly identical to the 1080p spread, indicating that the CPU is still the primary constraint at this resolution.

At 3840x2160, the GPU begins to take over. Low settings average 110 FPS, which is only 16.0% lower than the 1440p Low result. Medium settings average 95 FPS with a minimum of 81 FPS and a maximum of 109 FPS, showing a wider frame time range than at lower resolutions. High settings average 80 FPS, and Ultra settings drop to 61 FPS. The Low-to-Ultra spread at 4K is 49 FPS, or 44.5%, which is significantly larger than at lower resolutions. This confirms that the GPU is finally becoming the bottleneck at 4K, particularly at Ultra settings where the 61 FPS result represents the lowest measured frame rate in the entire dataset.

The Medium settings rows are the only ones with min and max FPS data. At 1080p Medium, the min is 109 FPS and the max is 147 FPS, a range of 38 FPS. At 1440p Medium, the min is 96 FPS and the max is 130 FPS, a range of 34 FPS. At 4K Medium, the min is 81 FPS and the max is 109 FPS, a range of 28 FPS. The narrowing range at higher resolutions suggests that the frame time variance decreases as the GPU becomes more loaded, which is typical behavior for CPU-bound scenarios where frame pacing can be more erratic.

GPU Role

The NVIDIA GeForce RTX 5090 D is a massive GPU with 32 GB of GDDR7 memory on a 512-bit bus, delivering 1.79 TB/s of memory bandwidth. It has 21,760 shading units, 680 TMUs, and 176 ROPs, with a boost clock of 2,407 MHz. The GPU's architecture is Blackwell 2.0 on a 5 nm process, with 92,200 million transistors on a 750 mm² die. In synthetic benchmarks, it scores 44,065 in Passmark G3D and 28,396 in Passmark GPU Compute, placing it at the 92nd percentile among all GPUs.

In Rust, the GPU's role becomes more prominent as resolution and settings increase. At 4K Ultra, the combo drops to 61 FPS, which is the clearest sign of GPU saturation. The GPU's 32 GB of VRAM is far more than Rust requires, even at 4K, so memory capacity is not a concern. The 1.79 TB/s bandwidth ensures that texture streaming and asset loading are not bottlenecks, which is important in Rust's open-world environment where the game constantly loads and unloads terrain and structures.

The GPU's ray tracing cores (170 RT cores) and tensor cores (680) are not directly relevant to Rust, which is primarily a rasterization-based game. However, the GPU's raw compute power (104.8 TFLOPS FP32) means that any future updates that add more complex lighting or physics would be well-served. The measured data shows that the GPU is underutilized at 1080p and 1440p, where the CPU limits performance. At 4K Low, the GPU still manages 110 FPS, which is impressive but still below what the GPU could theoretically achieve if paired with a stronger processor.

The GPU's nearest rivals in the database are the AMD Radeon RX 6650M XT (1.1% faster) and the AMD Radeon RX 6850M XT (1.6% slower), which are mobile GPUs. This is an odd comparison, as the RTX 5090 D is a desktop flagship with far higher power limits (575 W TDP). The percentile ranking of 92 indicates that it outperforms the vast majority of GPUs, but the nearestRivals data suggests that the benchmark methodology may be producing unusual results for this card. Regardless, the GPU is clearly not the limiting factor in most Rust scenarios tested here.

CPU Role

The Intel Core i5-10400F is a six-core, 12-thread processor based on the Comet Lake architecture, manufactured on a 14 nm process. It has a base clock of 2.90 GHz and a boost clock of 4.30 GHz, with 12 MB of shared L3 cache. The CPU supports DDR4 memory in dual-channel mode with a memory bandwidth of 42.7 GB/s, which is modest by modern standards. It uses PCIe Gen 3 with 16 lanes, which may limit the RTX 5090 D's PCIe 5.0 x16 interface to older bandwidth standards, though this is unlikely to be a significant factor in Rust.

In synthetic benchmarks, the i5-10400F scores 1,451 in Cinebench R23 single-core and 10,283 in multi-core. The single-core score is particularly telling for Rust, which is known for being heavily dependent on single-thread performance for its simulation logic. The 3DMark single-thread score of 688 and 2-thread score of 1,350 indicate that the CPU's per-core performance is adequate but not exceptional. The Passmark single-thread score of 2,541 confirms this assessment.

The CPU's role in Rust is evident from the resolution scaling data. At 1080p Low, the combo hits 149 FPS, but at 4K Low, it only drops to 110 FPS. This 26.2% reduction is far smaller than the 4x increase in pixel count, which strongly suggests that the CPU is the bottleneck at both resolutions. The CPU's 6 cores and 12 threads may be insufficient for Rust's complex simulation, which can spawn many threads for entity processing, physics, and AI. The 12 MB L3 cache is also relatively small, which could lead to frequent cache misses in scenarios with many entities.

The CPU's percentile ranking of 68 is respectable, but its nearest rivals are enterprise and low-power parts like the Intel Xeon 6756E (0.2% faster) and the Intel Core 7 160UL (0.3% slower). This indicates that the i5-10400F is competitive with a wide range of processors in synthetic tests, but Rust's specific workload may not favor it. The measured FPS data suggests that the CPU's 4.30 GHz boost clock is not high enough to push frame rates beyond the 149 FPS ceiling observed at 1080p Low. For players seeking higher frame rates, a CPU with stronger single-thread performance would likely yield significant gains.

Settings Recommendations

The measured data provides clear guidance on which settings preset offers the best experience for this combo. At 1080p, Medium settings deliver 128 FPS with a minimum of 109 FPS, which is only 21 FPS lower than Low settings but provides substantially better visual fidelity. The frame time consistency at Medium (min 109 FPS vs max 147 FPS) is solid, making it the best balance of performance and quality at this resolution. High settings at 1080p drop to 121 FPS, which is still excellent, but the 7 FPS gain from High to Medium is not worth the visual quality loss. Ultra at 1080p yields 109 FPS, which matches the Medium minimum, so there is no benefit to selecting Ultra over Medium at this resolution.

At 1440p, Medium settings produce 113 FPS with a minimum of 96 FPS, which remains above 60 FPS and offers a smooth experience. High settings at 1440p average 106 FPS, which is 6.2% lower than Medium but provides better visuals. The choice between Medium and High at 1440p depends on whether the player prioritizes frame rate headroom or visual quality. Ultra at 1440p drops to 96 FPS, which is still playable but represents a 15.0% reduction from Medium. Given that the GPU has plenty of VRAM and bandwidth, High is the best choice at 1440p for players who want a visual upgrade without sacrificing too much performance.

At 4K, the situation changes dramatically. Medium settings average 95 FPS with a minimum of 81 FPS, which is the only 4K preset with min FPS data and shows acceptable frame consistency. High settings drop to 80 FPS, which is a 15.8% reduction from Medium. Ultra at 4K falls to 61 FPS, which is below the 60 FPS threshold for many players and represents the worst performance in the dataset. The data suggests that Medium is the optimal choice at 4K, as it maintains a comfortable buffer above 60 FPS while providing decent visuals. Low at 4K offers 110 FPS but sacrifices significant visual quality, which is not recommended given that Medium is only 15 FPS lower.

Overall, the best experience across all resolutions is achieved with Medium settings. At 1080p Medium, the combo delivers 128 FPS with min FPS of 109. At 1440p Medium, it delivers 113 FPS with min FPS of 96. At 4K Medium, it delivers 95 FPS with min FPS of 81. This consistency across resolutions makes Medium the sweet spot for this CPU-GPU pairing, as it prevents the CPU from becoming too much of a bottleneck while also keeping the GPU workload manageable at higher resolutions. High settings are a viable alternative at 1080p and 1440p, but Ultra should be avoided in all cases due to the significant frame rate drops, particularly at 4K where it falls to 61 FPS.