Rust

The Intel Core i5-12400F paired with the NVIDIA GeForce RTX 5090 is a lopsided combination for Rust, where the CPU’s six Alder Lake cores struggle to feed one of the fastest GPUs on the market. Benchmark data shows this combo ranks 173rd out of 3,723 tested configurations, placing it in the top 5% of all pairings, yet the results are heavily skewed by resolution. At 1920x1080, the RTX 5090 is largely idle, while at 4K, the i5-12400F becomes the limiting factor in the most demanding preset. This analysis breaks down the measured FPS, explains where the bottleneck shifts, and identifies which settings deliver smooth gameplay across each resolution.

Measured FPS Breakdown

At 3840x2160, the combo delivers an average of 75 FPS on High settings, with no min or max data recorded for that preset. Dropping to Medium yields an average of 89 FPS, with a minimum of 76 and a maximum of 102 FPS. Low settings push the average to 132 FPS, while Ultra falls below the playable threshold at 57 FPS average. The gap between Medium and High is 14 FPS, while the jump from Medium to Low is 43 FPS, indicating that the Low preset removes a significant graphical load that the GPU can otherwise handle at 4K.

At 2560x1440, the results improve substantially. High settings produce an average of 127 FPS, Medium reaches 150 FPS (with min 128 and max 173), Low hits 181 FPS, and Ultra still manages 97 FPS. The scaling from 4K to 1440p is consistent: High improves by 52 FPS, Medium by 61 FPS, and Low by 49 FPS. Notably, Ultra at 1440p (97 FPS) outperforms High at 4K (75 FPS) by 22 FPS, showing that the resolution drop relieves enough pressure to allow higher quality settings.

At 1920x1080, the combo exceeds 140 FPS on every preset. High averages 166 FPS, Medium 176 FPS (min 149, max 202), Low 205 FPS, and Ultra 140 FPS. The spread between Low and Ultra is 65 FPS, which is the largest delta across all resolutions. Interestingly, the difference between High and Medium is only 10 FPS, while the gap from Medium to Ultra is 36 FPS, suggesting that the Ultra preset introduces effects that disproportionately tax the system at 1080p.

The min/max data for Medium settings shows consistent frametimes across all three resolutions: at 4K the range is 26 FPS (76-102), at 1440p it is 45 FPS (128-173), and at 1080p it is 53 FPS (149-202). This widening range at lower resolutions indicates that CPU-driven frame spikes become more noticeable when the GPU is not the bottleneck.

CPU and GPU Roles

The data reveals a clear shift in component responsibility based on resolution. At 3840x2160, the RTX 5090’s raw throughput dominates, as evidenced by the 57 FPS average on Ultra versus 132 FPS on Low — a 75 FPS swing driven entirely by GPU load. The i5-12400F, with its 6 cores and 12 threads, can keep up with the GPU at 4K High (75 FPS) and Medium (89 FPS), but the Ultra preset’s additional shading and texture work pushes the GPU to its limit while the CPU still has headroom.

At 2560x1440, the bottleneck begins to migrate toward the CPU. The Ultra preset averages 97 FPS, which is 40 FPS higher than 4K Ultra, but the scaling from Low (181 FPS) to Ultra (97 FPS) represents an 84 FPS drop. This suggests that the GPU is still the primary constraint at 1440p, but the CPU’s single-thread performance (3dmark_single_thread score of 909) starts to limit maximum framerates. The 181 FPS on Low is likely near the CPU’s ceiling for Rust’s simulation thread.

At 1920x1080, the CPU is definitively the limiting factor. The RTX 5090 can render Low settings at 205 FPS, but this is only 24 FPS higher than at 1440p (181 FPS), and the jump from 1440p Low to 1080p Low (24 FPS gain) is far smaller than the jump from 4K Low to 1440p Low (49 FPS gain). This indicates that the i5-12400F’s 2.50 GHz base clock and 4.40 GHz boost clock cannot push Rust’s frame rate much beyond 200 FPS, regardless of the GPU’s capability. The 140 FPS on Ultra at 1080p further confirms this, as the GPU is clearly capable of more but is starved by the CPU’s 18 MB of shared L3 cache and 6 physical cores.

Across all resolutions, the pattern is consistent: at 4K, the GPU’s 32 GB of GDDR7 memory and 1.79 TB/s bandwidth handle the load, while at 1080p, the CPU’s Passmark multithread score of 19,433 and single-thread score of 3,481 become the ceiling. The RTX 5090’s 104.8 TFLOPS FP32 performance is underutilized below 1440p.

Best Settings per Resolution

At 3840x2160, the most demanding preset that stays at or above 60 FPS is High, with an average of 75 FPS. Medium also qualifies at 89 FPS, and Low at 132 FPS, but High offers the best visual quality while maintaining a 15 FPS margin above the playable threshold of 60 FPS. Ultra falls short at 57 FPS, so it is not recommended at this resolution.

At 2560x1440, all four presets are playable, and the best setting is Ultra with an average of 97 FPS. This gives a 37 FPS cushion over the 60 FPS threshold, making it the clear choice for maximum visual fidelity. High (127 FPS), Medium (150 FPS), and Low (181 FPS) are all viable, but Ultra provides the most immersive experience without sacrificing smoothness.

At 1920x1080, Ultra is the best setting with an average of 140 FPS. This is 80 FPS above the playable threshold, leaving ample headroom for dips in heavy scenes. High (166 FPS), Medium (176 FPS), and Low (205 FPS) are all available, but the 140 FPS average on Ultra ensures that even the most demanding moments in Rust will remain fluid. The min/max data for Medium (149-202 FPS) suggests that frametimes are stable at 1080p, which further supports using Ultra.

How This Combo Ranks

The combo ranks 173rd out of 3,723 tested combinations, placing it in the top 4.6% of all pairings. This high rank is primarily driven by the RTX 5090’s exceptional benchmark scores — its Passmark G3D score of 39,650 and 3DMark Steel Nomad score of 18,355 put it in the 92nd percentile of all GPUs. However, the i5-12400F’s percentile of 73 among all CPUs (with an average benchmark score of 19,039) drags the overall ranking down when compared to combos with higher-end processors.

The rank of 173 suggests that while this combo is very fast, there are 172 other pairings that achieve better Rust performance. Given that the GPU is in the 92nd percentile but the CPU is only in the 73rd, it is likely that many of the higher-ranked combos pair the RTX 5090 with a stronger CPU. The data shows that at 1080p, the i5-12400F caps performance around 205 FPS, which is far below what the RTX 5090 could deliver with a faster processor.

In practical terms, this combo is overkill for 1080p gaming, where the CPU becomes the limiting factor. At 1440p, the combo performs well but still leaves performance on the table in CPU-bound scenarios. Only at 4K does the RTX 5090’s full potential come close to being realized, though the Ultra preset still falls short of 60 FPS.

Similar Performance Alternatives

Looking at the CPU’s nearest rivals, the AMD Ryzen 5 7535HS has an average benchmark score of 19,047, which is essentially identical to the i5-12400F’s 19,039 (0% delta). The Intel Core 3 201E scores 19,056 (-0.1% delta), and the Intel Core i5-1335U scores 18,982 (0.3% delta). These processors would behave nearly identically in Rust, meaning that swapping the i5-12400F for any of these would yield similar FPS results, especially at 1080p where the CPU is the bottleneck. The AMD EPYC 7773X also scores 18,979 (0.3% delta), though its server-oriented design might not translate directly to gaming performance.

For the GPU, the nearest rivals to the RTX 5090 are the NVIDIA Tesla P100 PCIe 16 GB (avg score 79,605, 0.3% delta), the Tesla P100 PCIe 12 GB (79,396, 0.6% delta), and the AMD Radeon RX 6850M XT (78,940, 1.1% delta). The AMD Radeon Pro Vega 64X scores 80,959, which is 1.4% higher than the RTX 5090’s 79,842 average. These alternatives would produce very similar frame rates in Rust, though the Tesla P100 cards lack the gaming-specific optimizations of the GeForce lineup. The RX 6850M XT, being a mobile GPU, might have different power characteristics but similar raw performance.

A combo using any of these rival CPUs with the RTX 5090 would likely produce FPS numbers within a few percentage points of the measured data. Conversely, pairing the i5-12400F with a GPU like the RX 6850M XT would shift the bottleneck more toward the GPU at 4K, potentially lowering Ultra settings performance.

FAQ

Q: Can this combo run Rust at 4K Ultra settings?

A: No. The average FPS at 3840x2160 Ultra is 57, which falls below the 60 FPS playable threshold. High settings are the best option at 4K, delivering 75 FPS average.

Q: What is the biggest bottleneck for this combo at 1080p?

A: The CPU. At 1920x1080 Low, the combo averages 205 FPS, but this is only 24 FPS higher than at 1440p Low (181 FPS), indicating that the i5-12400F’s 6 cores and 12 threads limit maximum framerates regardless of the RTX 5090’s capability.

Q: How does this combo rank among all tested configurations?

A: It ranks 173rd out of 3,723 combos, placing it in the top 4.6% of all pairings. The GPU’s 92nd percentile performance is offset by the CPU’s 73rd percentile score.

Q: Is the RTX 5090 worth pairing with the i5-12400F for Rust?

A: At 1440p and 4K, the GPU is the primary driver of performance, making the combo viable. At 1080p, the CPU limits the GPU to 205 FPS on Low, meaning the RTX 5090’s full potential is wasted.

Q: What settings should I use for the smoothest experience at 1440p?

A: Ultra settings at 2560x1440 average 97 FPS, which is 37 FPS above the playable threshold. This is the best quality setting that stays comfortably above 60 FPS.

Q: Are there cheaper GPU alternatives that would perform similarly?

A: The AMD Radeon RX 6850M XT has an average benchmark score of 78,940, which is 1.1% lower than the RTX 5090’s 79,842. This would produce nearly identical FPS in Rust, though it is a mobile part. The NVIDIA Tesla P100 variants also score within 0.6% of the RTX 5090.