Rust

The Intel Core i5-9400 paired with the NVIDIA GeForce RTX 5090 delivers a surprisingly balanced Rust experience, but the data reveals that the aging six-core CPU becomes the primary constraint at lower resolutions, while the GPU’s immense 32 GB VRAM and 1.79 TB/s bandwidth ensure that even Ultra settings remain playable at 4K. This combo ranks 420th out of 1,717 tested combinations, placing it in the top 24.5% of all systems, with measured frame rates ranging from 57.9 FPS at 4K Ultra to 142.6 FPS at 1080p Low. The results show that Rust’s engine rewards both raw GPU throughput and CPU single-thread performance, but the i5-9400’s six threads and 9 MB L3 cache create a bottleneck that becomes more evident as resolution drops.

FAQ

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

A: The data shows 1080p Low delivers the highest average FPS at 142.6, while 4K Ultra yields the lowest at 57.9. For a balance of visual quality and performance, 1440p High at 101.1 FPS offers a solid middle ground.

Q: How does the RTX 5090’s VRAM affect Rust performance?

A: With 32 GB of GDDR7 memory on a 512-bit bus, the GPU has more than enough capacity for Rust’s largest maps and highest textures. The 1.79 TB/s bandwidth ensures that even at 4K Ultra, the frame rate drops to 57.9 FPS, not due to memory limits but likely due to CPU constraints.

Q: Is the Intel Core i5-9400 a bottleneck for the RTX 5090?

A: Benchmark results indicate yes, especially at lower resolutions. At 1080p Low, the combo hits 142.6 FPS, but the CPU’s 6 cores and 6 threads with a 4.10 GHz boost clock limit how much further the GPU can push. The CPU’s percentile rank of 50 puts it at the median of all CPUs.

Q: What settings preset should I use for competitive play?

A: For maximum frame rates, Low settings at 1080p provides 142.6 FPS. Medium settings at the same resolution yield 122.4 FPS, which may offer better visual clarity while still maintaining high responsiveness. Ultra at 1080p drops to 106.8 FPS.

Q: How does this combo compare to similar CPU-GPU pairings?

A: The combo ranks 420th out of 1,717 tested, which is better than 75.5% of all combinations. The CPU’s nearest rival, the Intel Core i7-8809G, scores 0.6% higher in average benchmarks, while the RTX 5090’s closest competitor, the NVIDIA CMP 40HX, scores 1.6% higher.

Q: Can this system handle 4K gaming in Rust?

A: Yes, but with compromises. At 4K High, it averages 73.5 FPS, while 4K Medium hits 89.4 FPS. Ultra settings at 4K drop to 57.9 FPS, which is still playable but below the 60 FPS threshold for smooth gameplay.

How This Combo Ranks

The Intel Core i5-9400 + RTX 5090 combination sits at rank 420 out of 1,717 tested combos in Rust, placing it in the 75.5th percentile of all tested systems. This rank reflects a system that can handle the game’s demanding survival mechanics with high frame rates at most settings, but it is not among the elite combinations. The CPU’s average benchmark score of 2,305 places it at the 50th percentile of all CPUs, meaning half of all tested processors outperform it. The GPU, however, is exceptional: its average benchmark score of 84,306 puts it in the 94th percentile of all GPUs, with only 6% of graphics cards scoring higher. This disparity explains the combo’s mid-tier ranking — the GPU is far more capable than the CPU, and Rust’s performance reflects that imbalance. The nearest CPU rivals show how close the i5-9400 is to its peers: the Intel Core i3-10305 scores 0.2% higher, the Intel Core i3-1125G4 also 0.2% higher, and the Intel Xeon E-2134 0.4% higher, while the Intel Core i7-8809G is 0.6% lower. These tiny deltas mean the CPU is perfectly average for its class, but the RTX 5090’s GPU rivals are similarly close: the RTX 5090 D is 0.1% higher, the RTX 5050 Mobile 0.2% higher, and the AMD Radeon PRO W6600 1.3% higher, with the NVIDIA CMP 40HX 1.6% lower. The combo’s rank suggests that while the GPU can deliver massive frame rates, the CPU holds it back from reaching the top tier.

GPU Role

The NVIDIA GeForce RTX 5090 is a monster of a graphics card, built on the Blackwell 2.0 architecture with a 5 nm process from TSMC. Its 32 GB of GDDR7 memory on a 512-bit bus provides 1.79 TB/s of bandwidth, which is more than sufficient for Rust’s texture streaming and large world rendering. The GPU’s base clock of 2017 MHz boosts to 2407 MHz, and with 21,760 shading units, 680 texture mapping units, and 176 render output units, it can process massive amounts of pixel data. The pixel rate of 423.6 GPixel/s and texture rate of 1,636.8 GTexel/s mean that even at 4K resolution, the GPU is rarely the limiting factor. In Rust, this translates to high frame rates across all settings: at 1080p, the GPU pushes 142.6 FPS on Low, 122.4 FPS on Medium, 115.5 FPS on High, and 106.8 FPS on Ultra. The GPU’s 170 ray tracing cores and 680 tensor cores are underutilized in Rust, which is not a ray tracing-heavy title, but they contribute to the card’s overall compute capability. The RTX 5090’s 104.8 TFLOPS of FP32 performance is far beyond what Rust needs, yet the measured FPS shows that the GPU can still be held back by the CPU. The card’s 94th percentile GPU rank confirms its position as one of the fastest available, but in this combo, its potential is not fully realized at lower resolutions.

Measured FPS Breakdown

The measured FPS data provides a comprehensive look at how this combo performs across three resolutions and four quality presets. At 1920x1080, the average frame rates are 142.6 FPS on Low, 122.4 FPS on Medium, 115.5 FPS on High, and 106.8 FPS on Ultra. The gap between Low and Ultra is 35.8 FPS, showing that the CPU can still push high frame rates even when the GPU is heavily loaded. Moving to 2560x1440, the numbers drop: 127.2 FPS on Low, 107.1 FPS on Medium, 101.1 FPS on High, and 90.1 FPS on Ultra. The drop from 1080p to 1440p ranges from 15.4 FPS on Low to 16.7 FPS on Ultra, indicating a consistent scaling pattern. At 3840x2160, the frame rates fall further: 106.8 FPS on Low, 89.4 FPS on Medium, 73.5 FPS on High, and 57.9 FPS on Ultra. The transition from 1440p to 4K costs between 20.4 FPS on Low and 32.2 FPS on Ultra, showing that the GPU’s workload increases significantly at higher resolutions. Interestingly, the 1080p Ultra score of 106.8 FPS exactly matches the 4K Low score of 106.8 FPS, suggesting that the CPU is hitting a ceiling around that frame rate. The data shows that at 4K Ultra, the combo just barely misses the 60 FPS threshold, while 4K High at 73.5 FPS provides a comfortable experience. The measured values reveal that Low settings at any resolution deliver playable frame rates, but High settings at 4K are the most demanding that still remain fluid.

Settings Recommendations

Based on the measured FPS data, the optimal settings preset depends on the user’s priority. For maximum frame rates, 1080p Low delivers 142.6 FPS, which is ideal for competitive play where responsiveness matters most. This setting sacrifices visual fidelity but ensures the smoothest experience. For a balance of performance and visual quality, 1440p High at 101.1 FPS is a strong choice, offering higher resolution with only a 41.5 FPS drop from the fastest setting. Medium settings at 1440p yield 107.1 FPS, which is nearly identical to 1080p Ultra’s 106.8 FPS, making it a better value in terms of resolution per frame. At 4K, High settings at 73.5 FPS are the best option for 4K displays, as they stay above the 60 FPS threshold while providing good detail. Ultra settings at 4K at 57.9 FPS are borderline playable but risk noticeable stuttering in busy scenes. For 1080p users who want maximum visual quality, Ultra at 106.8 FPS is perfectly playable and just 35.8 FPS slower than Low. The data suggests that Medium presets are the sweet spot: they deliver 122.4 FPS at 1080p, 107.1 FPS at 1440p, and 89.4 FPS at 4K, all of which are above 60 FPS. In general, users should prefer High settings at 1440p or Medium at 4K for the best combination of clarity and smoothness.

CPU Role

The Intel Core i5-9400 is a 6-core, 6-thread processor from the Coffee Lake family, built on Intel’s 14 nm process. Its base clock of 2.90 GHz boosts to 4.10 GHz, and it features 64 KB of L1 cache per core, 256 KB of L2 cache per core, and 9 MB of shared L3 cache. This CPU has a TDP of 65 W and supports DDR4 memory in dual-channel mode with a bandwidth of 42.7 GB/s. In Rust, which is known for its CPU-intensive server-side calculations and physics, the i5-9400’s six threads are adequate but not exceptional. The CPU’s Cinebench R23 scores are 7,969 for multi-core and 1,125 for single-core, placing it at the 50th percentile of all CPUs. The single-core score of 1,125 is particularly relevant for Rust, as the game’s main thread often becomes the bottleneck in high-population servers. The measured FPS data supports this: at 1080p Low, the combo reaches 142.6 FPS, but this is likely CPU-limited, as the RTX 5090 is capable of far higher frame rates. The 4.10 GHz boost clock helps, but the lack of hyper-threading means only six threads are available for background tasks and the game’s auxiliary threads. The CPU’s nearest rival, the Intel Core i3-10305, scores nearly identically at 2,300 versus 2,305, confirming that the i5-9400 is a mid-range processor. The 9 MB L3 cache is shared across all cores, which helps with cache-sensitive workloads but cannot compensate for the limited thread count. In Rust, this CPU will hold back the RTX 5090 at lower resolutions, but at 4K, the GPU becomes the limiting factor, as shown by the 57.9 FPS at Ultra.

Resolution Scaling

The FPS drop from 1080p to 4K reveals how the bottleneck shifts between CPU and GPU. From 1080p Low at 142.6 FPS to 1440p Low at 127.2 FPS, the drop is 15.4 FPS, and then to 4K Low at 106.8 FPS, the further drop is 20.4 FPS. This totals a 35.8 FPS loss from 1080p to 4K on Low settings. On Ultra, the progression is 106.8 FPS at 1080p, 90.1 FPS at 1440p, and 57.9 FPS at 4K, representing a 48.9 FPS total drop. The percentage drop from 1080p to 4K is 25.1% on Low and 45.8% on Ultra, showing that higher settings amplify the GPU’s workload. Crucially, the 1080p Ultra score of 106.8 FPS matches the 4K Low score of 106.8 FPS exactly. This coincidence suggests that the CPU is capping frame rates at around 106.8 FPS in certain scenarios, regardless of resolution or settings. When moving from 1080p Ultra to 4K Low, the resolution quadruples, but the frame rate stays identical, implying that the CPU becomes the limiting factor at 1080p Ultra, while the GPU dominates at 4K Low. The data also shows that the i5-9400 can deliver up to 142.6 FPS when the GPU is lightly loaded, but once the settings increase, the CPU’s single-thread performance prevents higher frame rates. At 4K Ultra, the GPU is clearly the bottleneck, as the 48.9 FPS drop from 1080p Ultra indicates a heavy graphics load. Overall, the combo is GPU-limited at 4K, CPU-limited at 1080p, and balanced at 1440p, where the 127.2 FPS Low and 90.1 FPS Ultra scores demonstrate a more even distribution of workload.