Rust

Intel Core i5-12400F paired with the Intel Arc B390 produces a severely GPU-bound experience in Rust, with benchmark results showing that the integrated graphics solution is the primary constraint across all tested resolutions. The measured frame rates place this combination in the 2601st position out of 2953 tested combos, indicating performance in the bottom 12% of the database. The data shows a consistent pattern where the Arc B390's System Shared memory architecture and 80 W TDP limit the experience to playable levels only at 1080p with reduced settings, while higher resolutions and presets quickly become untenable.

GPU Role — VRAM, clocks, and how they relate to this game's results

The Intel Arc B390 operates with a base clock of 300 MHz and a boost clock of 2500 MHz, built on the Xe3-LPG architecture using a 3 nm process. Its memory configuration is entirely System Shared, meaning there is no dedicated VRAM; the GPU draws from system memory with bandwidth described as System Dependent. This architecture directly impacts Rust's performance, as the game's open-world survival mechanics require frequent texture streaming and world-state updates that benefit from dedicated memory bandwidth.

The GPU's compute resources include 1536 shading units, 48 texture mapping units, 24 render output units, and 12 ray tracing cores. Peak theoretical performance is 7.680 TFLOPS for FP32 and 15.36 TFLOPS for FP16 (2:1 ratio). The pixel rate is 60.00 GPixel/s and texture rate is 120.0 GTexel/s. The 3DMark Steel Nomad DX12 benchmark score of 1482 places the Arc B390 at the 9th percentile of all GPUs, with nearest rivals including the NVIDIA GeForce GT 520MX (1.3% faster), GeForce 800M (1.5% faster), and GeForce GT 625 OEM (2.5% faster).

Benchmark results indicate that this GPU is fundamentally limited for Rust, a title that scales heavily with raw fill rate and memory bandwidth. At 1080p Low, the combination achieves 76 FPS average, but this drops to 43 FPS at High and 33 FPS at Ultra. The pattern suggests that the System Shared memory becomes a bottleneck as texture detail increases, with the GPU unable to maintain consistent frame delivery. The 80 W TDP and IGP slot width classify this as an integrated solution, which explains the modest performance envelope relative to discrete alternatives.

How This Combo Ranks — use comboRankInGame vs other tested combos

The Intel Core i5-12400F + Intel Arc B390 combination ranks 2601st out of 2953 tested combos in Rust, placing it in the 12th percentile overall. This is a bottom-tier result that reflects the GPU's limitations rather than the CPU's capabilities. The CPU itself holds the 73rd percentile among all processors, suggesting a significant mismatch between the two components' performance classes.

The data shows that this combo's ranking is almost entirely GPU-determined. The Arc B390's percentile rank of 9 among all GPUs is far lower than the CPU's 73rd percentile, indicating that the graphics solution is the limiting factor in virtually all scenarios. In practical terms, this means the combo sits alongside other low-end integrated graphics configurations, far below the median performance level required for smooth Rust gameplay at modern standards.

Comparing to the nearest rival combos would show that even entry-level discrete GPUs from several generations ago outperform this setup. The GPU's nearest rivals — GT 520MX, GeForce 800M, GT 625 OEM, and GT 710 — all score similarly in the 3DMark Steel Nomad test, with deltas between 1.3% and 2.7%. These are legacy parts from over a decade ago, underscoring that the Arc B390's performance tier is exceptionally low for a modern release.

Resolution Scaling — how FPS drops from 1080p to 4K and what it says about the limiting component

Resolution scaling reveals the classic signature of a GPU-bound system. At Low settings, the average FPS drops from 76 at 1080p to 53 at 1440p (a 30.3% decrease) and then to 31 at 2160p (a 59.2% decrease from 1440p). This pattern indicates that the GPU's fill rate and memory bandwidth are the primary constraints, as the frame rate scales inversely with pixel count.

At High settings, the same trend appears: 43 FPS at 1080p, 30 FPS at 1440p (30.2% decrease), and 18 FPS at 2160p (40% decrease from 1440p). The Medium preset shows 51 FPS at 1080p, 35 FPS at 1440p (31.4% decrease), and 21 FPS at 2160p (40% decrease from 1440p). Ultra settings produce 33 FPS at 1080p, 23 FPS at 1440p (30.3% decrease), and 13 FPS at 2160p (43.5% decrease from 1440p).

The consistent ~30% drop from 1080p to 1440p across all settings confirms that the limiting component is the GPU, not the CPU. The Intel Core i5-12400F, with 6 cores and 12 threads boosting to 4.40 GHz, would have ample headroom for Rust's CPU demands; the frame rate declines are directly proportional to pixel throughput requirements. The System Shared memory further exacerbates the issue at 4K, where the 31 FPS Low result indicates that even minimal settings cannot overcome the bandwidth limitation.

Settings Recommendations — which preset gives the best experience per the measured rows

Based on the measured FPS rows, the optimal experience for this combo is 1080p with the Low preset, which delivers 76 FPS average. This is the only configuration that approaches the 60 FPS threshold commonly considered playable. The Medium preset at 1080p yields 51 FPS, which is acceptable but not smooth, while High drops to 43 FPS and Ultra falls to 33 FPS.

At 1440p, the Low preset produces 53 FPS, which is borderline playable but with noticeable dips. The Medium preset at 1440p yields 35 FPS, which is marginal. For users who prioritize resolution over smoothness, 1440p Low is the only reasonable choice. At 2160p, all presets produce frame rates below 31 FPS, making 4K gaming impractical with this configuration.

The data suggests that the Low preset at 1080p offers the best balance of visual quality and performance, as it is the only setting that maintains a frame rate above 70 FPS. The Medium preset provides a 51 FPS average with min FPS of 44, which may be acceptable for less demanding playstyles. Higher presets are not recommended due to the steep performance penalties that come with minimal visual gains on this GPU.

Measured FPS Breakdown — resolution by resolution, settings by settings, exact numbers

At 3840x2160, the Arc B390 delivers 31 FPS on Low, 21 FPS on Medium (min 18, max 24), 18 FPS on High, and 13 FPS on Ultra. These numbers indicate that 4K gaming is not viable, as even the lowest preset fails to reach 32 FPS.

At 2560x1440, performance improves meaningfully: 53 FPS on Low, 35 FPS on Medium (min 30, max 41), 30 FPS on High, and 23 FPS on Ultra. This resolution offers a playable experience only on Low settings, with Medium providing a playable-but-rough experience and higher presets falling below 30 FPS.

At 1920x1080, the results are: 76 FPS on Low, 51 FPS on Medium (min 44, max 59), 43 FPS on High, and 33 FPS on Ultra. The Low preset is the only one that exceeds 60 FPS, while Medium approaches playability at 51 FPS. The gap between Low and Medium is 25 FPS, while the gap between Medium and High is 8 FPS, and High to Ultra is 10 FPS, showing diminishing returns as settings increase.

The min FPS data, available only for Medium presets, shows 44 FPS at 1080p, 30 FPS at 1440p, and 18 FPS at 2160p. These minimums represent the frame drops during intense scenes, which are more pronounced at higher resolutions, suggesting that the System Shared memory cannot sustain consistent throughput.

FAQ — 4-6 Q&A pairs answerable from FACT PACK data

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

A: The 1920x1080 resolution with Low settings delivers 76 FPS average, which is the highest measured frame rate. The 2560x1440 Low preset achieves 53 FPS, while all 2160p configurations fall below 31 FPS.

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

A: This combination ranks 2601st out of 2953 tested combos in Rust, placing it in the bottom 12% of all tested systems. The GPU's 9th percentile ranking among all GPUs is the primary driver of this low position.

Q: Is the Intel Core i5-12400F or the Intel Arc B390 the limiting factor?

A: The GPU is the limiting factor. The CPU holds the 73rd percentile among all processors, while the GPU holds the 9th percentile. The frame rate drops from 1080p to 4K are proportional to pixel count, indicating GPU-bound performance.

Q: Can this system play Rust at 4K?

A: No. At 3840x2160, the highest average FPS is 31 on Low settings. Medium produces 21 FPS, High produces 18 FPS, and Ultra produces 13 FPS, all below playable thresholds.

Q: What is the performance difference between Low and Ultra at 1080p?

A: At 1920x1080, Low settings produce 76 FPS while Ultra produces 33 FPS, representing a 43 FPS difference. Low is 130% faster than Ultra at this resolution.

Q: How does the Arc B390 compare to its nearest GPU rivals?

A: In the 3DMark Steel Nomad DX12 benchmark, the Arc B390 scores 1482. The NVIDIA GeForce GT 520MX scores 1463 (1.3% slower), GeForce 800M scores 1460 (1.5% slower), and GeForce GT 625 OEM scores 1446 (2.5% slower).

CPU Role — cores, clocks, and how they relate to this game's results

The Intel Core i5-12400F provides 6 cores and 12 threads based on Alder Lake architecture, with a base clock of 2.50 GHz and boost clock of 4.40 GHz. The 18 MB shared L3 cache and dual-channel memory support (DDR4 and DDR5) give the CPU substantial bandwidth for gaming workloads. Its 65 W TDP and 10 nm process node position it as an efficient mid-range desktop processor.

The CPU's benchmark scores demonstrate its capability: Cinebench R23 multicore reaches 12380 and single-core 1680; Geekbench multicore scores 9472 and single-core 1964. The 3DMark multi-threaded tests show scaling from 1699 (2 threads) to 5895 (16 threads), indicating good thread scaling. PassMark multithread score is 19433 with single-thread at 3481. The CPU holds the 73rd percentile among all processors, with nearest rivals including the AMD Ryzen 5 7535HS (0% delta), Intel Core 3 201E (-0.1%), Intel Core i5-1335U (0.3%), and AMD EPYC 7773X (0.3%).

In Rust, the CPU's role is secondary to the GPU. The measured FPS data shows no evidence of CPU limitation: frame rates scale consistently with GPU load across resolutions. The 6-core/12-thread configuration is more than sufficient for Rust's simulation and physics workload, as evidenced by the fact that the combo's low ranking stems entirely from GPU performance. The CPU's 4.40 GHz boost clock provides strong single-thread performance, which is relevant for Rust's primary game thread, but the GPU bottleneck masks any potential CPU advantage.

The CPU's 18 MB L3 cache and dual-channel memory architecture help mitigate the Arc B390's System Shared memory limitation, but cannot overcome it. The data indicates that Rust's performance with this combo would not improve meaningfully with a stronger CPU, as the GPU is already saturated at all tested settings. This makes the i5-12400F a well-matched companion for the Arc B390 in terms of avoiding CPU bottlenecks, though the overall experience remains constrained by the integrated graphics solution.