Rust

The pairing of the Intel Core i5-10400F with the NVIDIA GeForce RTX 4090 in Rust presents a stark illustration of component hierarchy. The benchmark data shows a system where the GPU’s immense raw power is consistently mediated by the CPU’s older architecture. This combination ranks 342nd out of 1717 tested configurations in the game, placing it in the top 20% of all combos, but the performance profile reveals that this is not a balanced partnership. The measured frames per second across resolutions and settings tell a story of a CPU bottleneck that becomes less severe as the resolution increases, shifting the load onto the graphics card.

Resolution Scaling

The FPS progression from 1080p to 4K reveals a classic pattern of load transfer. At 1920x1080 with Low settings, the combo achieves 148.4 FPS. Moving to 2560x1440 Low drops this to 132.6 FPS, a reduction of 10.6%, and at 3840x2160 Low, the score falls to 109 FPS, a further 17.8% decline. This relatively modest scaling between 1080p and 1440p suggests that at lower resolutions, the Intel Core i5-10400F is the limiting factor, preventing the RTX 4090 from fully stretching its legs. The frame rate does not increase substantially when the resolution drops, indicating the CPU is saturated.

However, the scaling steepens when moving from 1440p to 4K, particularly at higher settings. For High settings, the transition from 106.1 FPS at 2560x1440 to 74 FPS at 3840x2160 represents a 30.2% performance hit. This larger drop indicates that the GPU is becoming the primary bottleneck at 4K, as the pixel throughput demands of the RTX 4090 finally outpace the data delivery of the CPU. The trend is consistent across all settings; the Ultra preset shows the most significant absolute drop, from 95.9 FPS at 1440p to 56.8 FPS at 4K, a 39.2% reduction, demonstrating that the combination of high resolution and high graphical fidelity creates a workload that is firmly GPU-limited.

The data suggests that the 1080p results are artificially capped. The difference between Low and Ultra at 1080p is only 41.2 FPS (from 148.4 to 107.2), which is a 27.8% spread. At 4K, the same settings comparison yields a 52.2 FPS difference (from 109 to 56.8), a 47.9% gap. This widening delta at higher resolutions confirms that the CPU’s influence wanes as the GPU’s rendering time increases, allowing the graphical settings to have a more pronounced effect on the final frame rate. For this combo, 1080p is a CPU-bound scenario, while 4K is a GPU-bound one.

CPU Role

The Intel Core i5-10400F is a 6-core, 12-thread processor from the Comet Lake generation, with a base clock of 2.90 GHz and a boost clock of 4.30 GHz. Its benchmark scores place it at the 73rd percentile of all CPUs, with an average benchmark score of 14168. This is a mid-range performer, and its role in Rust is to feed the RTX 4090 with draw calls and game logic. The data indicates that this processor, while competent, cannot keep pace with the GPU’s capabilities at lower resolutions. The single-thread performance, as measured by a 3dmark single-thread score of 688, is a critical factor for a game like Rust, which has a significant reliance on single-core performance for its simulation.

Comparing the i5-10400F to its nearest rivals shows a tight cluster of performance. It sits just 0.4% above the AMD EPYC 7552, and 1.1% below the Intel Core i5-8500. This indicates that the processor is not an outlier in either direction; it is a standard performer for its class. The multi-threaded capabilities are more robust, with a cinebench_r23_multicore score of 10297 and a passmark_multithread score of 12115, suggesting that when the game can utilize multiple threads, the processor has reasonable headroom. However, the limiting factor appears to be the per-core speed and IPC (instructions per clock) of the older 14 nm Comet Lake architecture, which is not sufficient to maintain peak frame rates with a top-tier GPU.

The 12 MB of shared L3 cache is a substantial pool for the era, but it does not compensate for the architectural age. The benchmark results show that the CPU’s performance ceiling is reached in Rust’s CPU-intensive scenes, which is why the frame rates at 1080p are not significantly higher than those at 1440p. The processor is effectively the gatekeeper, and its 73rd percentile ranking among all CPUs underscores that while it is not a weak part, it is mismatched with a GPU that sits in the 91st percentile of all GPUs. This mismatch is the defining characteristic of this combo’s performance.

GPU Role

The NVIDIA GeForce RTX 4090 is a behemoth, built on the 5 nm Ada Lovelace architecture. Its specifications are extraordinary: 16384 shading units, 24 GB of GDDR6X memory on a 384-bit bus, and a memory bandwidth of 1.01 TB/s. It is the 91st percentile GPU with an average benchmark score of 66473. In this combo, its role is to render the frames that the CPU permits. At 4K Ultra, the RTX 4090 is finally able to flex its muscles, and the frame rate of 56.8 FPS reflects the immense pixel and shading workload. The GPU’s performance is not in question; it is the delivery of data to it that is the bottleneck.

The GPU’s memory capacity and bandwidth are far beyond what a game like Rust requires, even at 4K. This means that the 24 GB VRAM pool is not a limiting factor, and the 1.01 TB/s bandwidth ensures that texture streaming is not a problem. The core clock speeds, with a boost of 2520 MHz, allow for massive compute throughput, evidenced by the fp32 performance of 82.58 TFLOPS. The benchmark data shows that the GPU scales as expected when the load is increased. The passmark_g3d score of 38194 is a strong indicator of its rasterization prowess, but the measured FPS in Rust shows that this power is only fully realized when the resolution is high enough to create a GPU-bound scenario.

The contrast between the CPU and GPU percentiles is stark: 73rd for the processor versus 91st for the graphics card. This 18-percentile gap is the quantitative measure of the imbalance. At 1080p, the RTX 4090 is largely idle, waiting for the CPU to issue commands. At 4K, the GPU is the primary workhorse, and the FPS drop from Low (109) to Ultra (56.8) is a direct consequence of the increased shading and pixel work. The GPU’s performance in this game is effectively capped by the CPU at lower resolutions, but at 4K, it demonstrates the raw capability that makes it a top-tier component, even if the overall combo ranking is dragged down by the older processor.

FAQ

Q: Why is the frame rate at 1080p not much higher than at 1440p?

A: The data shows that at 1080p Low, the combo achieves 148.4 FPS, while at 1440p Low, it achieves 132.6 FPS. This relatively small 10.6% drop indicates that the Intel Core i5-10400F is the limiting component at 1080p, preventing the RTX 4090 from generating more frames. The CPU saturates before the GPU does at this resolution.

Q: At which resolution does the GPU become the primary bottleneck?

A: The performance scaling indicates a shift at 4K. For High settings, moving from 2560x1440 (106.1 FPS) to 3840x2160 (74 FPS) results in a 30.2% drop, which is significantly larger than the drop from 1080p to 1440p. This steep decline demonstrates that the RTX 4090 is now the limiting factor, as the pixel workload overwhelms the CPU’s data feed.

Q: How does the CPU’s single-thread performance affect Rust?

A: Rust is sensitive to single-thread performance. The i5-10400F has a 3dmark single-thread score of 688 and a passmark_single_thread score of 2541. These scores, while not weak, are insufficient to fully drive the RTX 4090 at lower resolutions, as evidenced by the plateau in FPS between 1080p and 1440p.

Q: Is the 24 GB of VRAM on the RTX 4090 necessary for Rust?

A: The benchmark data does not indicate VRAM capacity as a limiting factor. The GPU’s 24 GB frame buffer and 1.01 TB/s bandwidth are far beyond the requirements of Rust, even at 4K Ultra settings. The performance is instead dictated by the core clocks and the CPU’s ability to feed the GPU.

Q: How does this combo rank compared to other tested systems?

A: This specific configuration ranks 342nd out of 1717 tested combos in Rust. This places it in the top 20% of all systems, but the ranking is tempered by the CPU’s 73rd percentile standing versus the GPU’s 91st percentile, showing a significant performance mismatch.

Q: What is the effect of increasing graphical settings at 4K?

A: At 4K, the settings have a pronounced effect. The average FPS drops from 109 on Low to 87.5 on Medium, 74 on High, and finally 56.8 on Ultra. This 52.2 FPS spread between Low and Ultra confirms that at 4K, the RTX 4090 is the primary performance driver, and the graphical settings directly impact the rendering load.

How This Combo Ranks

The combo’s rank of 342 out of 1717 combos places it in the 80th percentile of all tested systems. This is a strong overall position, but it is not indicative of a harmonious pairing. The rank is likely buoyed by the sheer power of the RTX 4090, which ensures that even with a weaker CPU, the system can achieve high frame rates, especially at higher resolutions. The data suggests that this combo is overqualified for 1080p gaming, where it performs admirably but leaves performance on the table due to the CPU limit.

A more balanced system might feature a CPU with a higher percentile ranking to match the GPU. The i5-10400F’s 73rd percentile is the weak link in this chain, and it is the reason why the combo does not rank higher. Comparing the processor’s average benchmark score of 14168 to the GPU’s 66473, the GPU outclasses the CPU by a factor of 4.7 in raw compute potential. This disparity is the reason why the system’s overall rank is not higher.

The performance data indicates that the RTX 4090 is being held back. At 1080p Ultra, the system produces 107.2 FPS, which is a respectable number, but a more capable CPU could push this figure significantly higher. The 4K Ultra result of 56.8 FPS is a more accurate representation of the GPU’s true potential, as it is the scenario where the GPU is the bottleneck. Consequently, this combo is best utilized at 4K resolution, where the CPU’s limitations are masked by the GPU’s immense rendering power. The rank of 342 reflects a system that is excellent for high-resolution gaming but is not optimized for maximum performance at lower resolutions, where the CPU’s age becomes a liability.