Rust

Intel Core i5-12400 and NVIDIA GeForce RTX 3080 Ti is a pairing that pits a mid-range 12th Gen processor against a high-end Ampere flagship. In Rust, the data reveals a system that scales predictably with resolution and settings, but the relationship between the CPU’s six cores and the GPU’s 12 GB of VRAM tells a more nuanced story about where the bottleneck lies. Benchmark results show this combo ranks 425th out of 1717 tested combinations, placing it in the top quartile of all pairings, yet the FPS figures suggest that the RTX 3080 Ti is often waiting on the i5-12400 to catch up.

FAQ

Q: What is the average FPS at 1080p with Low settings?

A: The benchmark data shows an average of 203.7 FPS, which is the highest score recorded for this combo across all tested resolutions and settings.

Q: How much faster is the i5-12400 compared to its nearest rival in synthetic tests?

A: The Intel Core i5-12400 averages a benchmark score of 19850, which is 0.1% ahead of the Intel Core i7-9700 (19831) and 0.4% ahead of the Intel Core i5-11600K (19771). It trails the Intel Core i7-8700 (19894) by 0.2%.

Q: What is the VRAM capacity of the RTX 3080 Ti in this test setup?

A: The GPU is equipped with 12 GB of GDDR6X memory, operating across a 384-bit bus with a bandwidth of 912.4 GB/s.

Q: Does the combo rank higher in Rust than in overall GPU benchmarks?

A: The GPU alone holds an 83rd percentile ranking among all GPUs, but the combo’s rank in Rust is 425 out of 1717 — roughly the top 25% of system pairings tested.

Q: What is the FPS difference between 1080p and 4K at Ultra settings?

A: At 1080p Ultra the combo achieves 99.1 FPS, while at 4K Ultra it drops to 38.9 FPS — a reduction of 60.2 FPS, indicating a heavy GPU load at higher pixel counts.

Q: Which resolution and settings combo yields the most balanced 60+ FPS experience?

A: 1440p Medium produces 102.4 FPS, while 4K Medium reaches 62.8 FPS, both comfortably above 60 FPS thresholds.

GPU Role

The NVIDIA GeForce RTX 3080 Ti is the dominant component in this pairing, built on the GA102 chip with 10240 shading units and 80 RT cores. Its 12 GB of GDDR6X memory is a critical asset for Rust, which is known for large world textures and memory-hungry environments. The memory bandwidth of 912.4 GB/s allows the GPU to feed data to its 320 TMUs and 112 ROPs without stalling, a factor that becomes more relevant at higher resolutions where texture fetch demands grow.

The GPU’s boost clock of 1665 MHz is modest compared to the sheer parallel throughput available — 34.10 TFLOPS of FP32 compute. In Rust’s measured FPS, the GPU’s role shifts dramatically with settings. At 4K Low, the card pushes 90.5 FPS, but at 4K Ultra it falls to 38.9 FPS, a 57% drop. This suggests that the RTX 3080 Ti’s raw rasterization power is sufficient for low-detail work, but the Ultra preset’s added shading and texture effects saturate the GPU’s resources.

The fact that the GPU holds an 83rd percentile ranking among all GPUs (avg benchmark score 41224) while the combo only ranks 425th in Rust implies that the CPU is holding back the system from its full potential. The RTX 3080 Ti is a capable 4K card in other contexts, but in this specific game, its performance is constrained by the i5-12400’s ability to issue draw calls and manage game logic.

Resolution Scaling

The FPS progression from 1080p to 4K reveals a classic GPU-bound scaling pattern, but with an interesting twist at lower settings. At Low settings, the average FPS goes from 203.7 (1080p) to 154.2 (1440p) to 90.5 (4K) — a steady decline that suggests the GPU is doing most of the work. However, at Ultra settings, the drop is steeper: from 99.1 FPS at 1080p to 65.7 at 1440p and finally 38.9 at 4K.

This scaling behavior indicates that at 1080p Low, the system is likely CPU-limited, as the RTX 3080 Ti should be capable of far more than 203.7 FPS in a game like Rust. The fact that 1080p Low only achieves 203.7 FPS, while 1440p Low still hits 154.2 FPS, suggests that the i5-12400’s six cores are the limiting factor at lower resolutions. At 4K, the GPU becomes the primary bottleneck, with the frame rate dropping to 53.7 FPS at High settings — a figure that aligns with the GPU’s expected performance at that pixel count.

The data implies that this combo is best suited for 1440p gaming, where the FPS range of 65.7 to 154.2 across settings shows a good balance between CPU and GPU utilization. At 4K, the system struggles to maintain 60 FPS on higher presets, indicating that the RTX 3080 Ti’s 12 GB VRAM and 912.4 GB/s bandwidth are not sufficient to overcome the rendering demands of Rust’s Ultra settings at that resolution.

Measured FPS Breakdown

Starting with 1080p, the combo delivers 203.7 FPS at Low, 151.1 FPS at Medium, 128.9 FPS at High, and 99.1 FPS at Ultra. These numbers show a clear progression: each step up in settings costs roughly 25-30 FPS, with the largest gap between Low and Medium (52.6 FPS). The 1080p results are uniformly high, with even Ultra staying above 90 FPS, making this resolution a comfortable zone for the combo.

At 1440p, the averages are 154.2 FPS (Low), 102.4 FPS (Medium), 87.4 FPS (High), and 65.7 FPS (Ultra). The drop from Low to Medium is significant at 51.8 FPS, but the subsequent steps are smaller (15 FPS and 21.7 FPS). This suggests that Medium is a sweet spot for 1440p, offering nearly double the frame rate of Ultra while still looking good.

The 4K data shows the most strain: 90.5 FPS at Low, 62.8 FPS at Medium, 53.7 FPS at High, and 38.9 FPS at Ultra. Here, the gap between Low and Medium is 27.7 FPS, but High and Ultra fall below the 60 FPS threshold. The data indicates that 4K gaming is only viable on Low or Medium settings, and even then, the frame rates are borderline for competitive play.

Across all resolutions, the pattern is consistent: Low settings provide headroom for high refresh rates, while Ultra settings push the system to its limits. The fact that 1080p Low exceeds 200 FPS but 4K Ultra stays under 40 FPS highlights the extreme sensitivity of Rust to pixel count and shading complexity.

How This Combo Ranks

With a combo rank of 425 out of 1717 tested systems, this pairing sits in the top 25% of all combinations in the database for Rust. This is a respectable position, but it lags behind what the GPU alone would suggest — the RTX 3080 Ti holds an 83rd percentile rank among all GPUs, while the i5-12400 sits at the 77th percentile among CPUs. The gap between these two percentiles explains why the combo doesn’t crack the top 300: the CPU is the weaker link.

The i5-12400’s nearest rivals in CPU benchmarks are the Intel Core i7-9700 (0.1% slower) and Intel Core i7-8700 (0.2% faster), which are both older architectures. This suggests that the i5-12400’s Alder Lake design, with 6 cores and 12 threads, is competitive with previous generation high-end parts but not a match for newer or higher-core-count CPUs. In Rust, which is known for being CPU-intensive in its simulation and building mechanics, this could be the reason the combo ranks below systems with more powerful processors.

The GPU’s nearest rivals include the RTX 3090 (0.5% faster) and RTX 5070 (1.1% faster), indicating that the RTX 3080 Ti is just below the top tier of graphics cards. Yet in Rust, the combo’s rank suggests that the GPU’s potential is not fully realized, as the CPU limits the frame rate in many scenarios.

Settings Recommendations

For players prioritizing high frame rates, 1080p Low is the clear choice, delivering 203.7 FPS — ideal for competitive play or high refresh rate monitors. However, the visual trade-off is substantial. At 1440p, Medium provides the best balance, hitting 102.4 FPS while maintaining a reasonable level of graphical fidelity. This is the recommended preset for most users, as it offers over 100 FPS without sacrificing too much detail.

At 4K, the data points to Low as the only playable option, with 90.5 FPS. Medium at 4K (62.8 FPS) is borderline, but the drop to High (53.7 FPS) and Ultra (38.9 FPS) makes those settings impractical for smooth gameplay. Given that the combo ranks 425th overall, leaning into 1440p Medium seems optimal — it avoids the CPU bottleneck at 1080p and the GPU saturation at 4K.

If visual quality is paramount, 1080p Ultra (99.1 FPS) or 1440p High (87.4 FPS) are viable, offering high detail with still-respectable frame rates. The data shows no scenario where Ultra settings at 4K provide a playable experience, so users should avoid that configuration entirely.

CPU Role

The Intel Core i5-12400 is a 6-core, 12-thread processor from the Alder Lake family, with a base clock of 2.50 GHz and a boost clock of 4.40 GHz. Its 18 MB of shared L3 cache is modest by modern standards, but the 10 nm process and DDR4/DDR5 memory support give it solid fundamentals. In synthetic benchmarks, it scores 15935 in Cinebench R23 multicore and 2249 in single-core, placing it in the 77th percentile of all CPUs.

In Rust, the CPU’s role is most evident at 1080p Low, where the FPS caps at 203.7 — a figure that is likely limited by the CPU’s single-thread performance rather than the GPU. The 3DMark single-thread score of 910 and Cinebench R20 single-core score of 944 suggest that the i5-12400’s per-core performance is good but not exceptional. Rust’s game engine relies heavily on a few threads for physics and entity updates, which can create a bottleneck with only 6 physical cores.

Compared to its rivals, the i5-12400 is nearly identical in performance to the i7-9700 (0.1% faster) and i7-8700 (0.2% slower), but those are older chips with similar core counts. This implies that the CPU is not a weak point per se, but it also doesn’t provide the headroom that a higher-core-count or newer processor might offer. In this combo, the CPU’s 65 W TDP and 163 mm² die size indicate a power-efficient design, yet in Rust’s CPU-heavy scenarios, the data shows that the RTX 3080 Ti is often underutilized, particularly at lower resolutions where the CPU becomes the limiting factor.