Rust

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

The AMD Ryzen 5 2600 is a 6-core, 12-thread processor from the 2000 series, built on the Zen architecture (specifically Zen+ Pinnacle Ridge) using a 12 nm process at GlobalFoundries. It runs at a base clock of 3.40 GHz and boosts up to 3.90 GHz. This is a desktop part on the AM4 socket with a 65 W TDP, and it supports DDR4 memory in a dual-channel configuration with 46.9 GB/s of bandwidth. The L3 cache is 16 MB shared across all cores, with 512 KB L2 per core and 96 KB L1 per core.

In Rust, the CPU's role is substantial because the game is known for heavy simulation and entity processing. The benchmark results confirm that at lower resolutions and settings, the CPU is a significant factor. Looking at the measured FPS data, at 1080p Low the combo achieves 76 FPS average, but at 1080p High it drops to 43 FPS. This 33 FPS gap between Low and High at the same resolution suggests the CPU is struggling to feed the GPU with enough frames when the game demands more per-frame work. The Ryzen 5 2600's single-thread performance, as indicated by its Geekbench single-core score of 1154, is modest by modern standards. Its Passmark single-thread score of 2239 places it in the 75th percentile among all CPUs, which is respectable but not elite.

The CPU's multi-threaded capability is stronger. Cinebench R15 multi-core yields 1248 points, and Geekbench multi-core reaches 5648. Passmark multi-thread score is 13160, with integer math at 44518 and floating-point math at 22942. These numbers show a processor that can handle parallel workloads, but Rust's single-thread-heavy nature means the 2600's boost clock of 3.90 GHz is the more critical figure. The data shows that at 4K Ultra, the combo drops to 13 FPS average, which is barely playable. At 1080p Low, it reaches 76 FPS, indicating that when the CPU is given less to do per frame, it can produce acceptable frame rates.

The nearest rivals for the CPU, based on average benchmark scores, include the Intel Core Ultra 5 228V (0.2% faster), Intel Core i9-11900H (0.5% faster), Intel Xeon D-1746TER (0.7% slower), and AMD EPYC 9454 (1.2% faster). These deltas are small, meaning the 2600 sits in a tightly packed performance band. However, the EPYC 9454 being only 1.2% faster in average score highlights that synthetic benchmarks don't always translate to gaming performance, since the 2600's architecture and cache layout are optimized for consumer workloads.

In Rust specifically, the combination of 6 cores and 12 threads provides enough parallelism for background tasks, but the game's main thread is the bottleneck. The measured FPS at 1080p Medium (51 FPS) versus 1080p Low (76 FPS) shows a 25 FPS drop when increasing settings, which is more than what a purely GPU-bound system would exhibit. This suggests the CPU is limiting the frame rate even at moderate settings. The 16 MB L3 cache helps with the game's asset streaming, but it's not enough to overcome the single-thread limitations when the game scales up its draw calls and entity updates.

FAQ

Q: Is the AMD Ryzen 5 2600 a bottleneck for the Intel Arc B390 in Rust?

A: The data indicates yes, particularly at lower resolutions and settings. At 1080p Low, the combo hits 76 FPS, but at 1080p High it drops to 43 FPS. This 33 FPS drop from a settings change suggests the CPU cannot maintain frame pacing when the game requests more per-frame work. At 4K, the GPU becomes the primary limiter, but at 1080p the CPU's single-thread performance (Geekbench single-core 1154, Passmark single-thread 2239) is the constraint.

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

A: Based on the measured data, 1080p Low provides the highest average FPS at 76. If you want a balance, 1440p Low gives 53 FPS average. At 4K Low, it drops to 31 FPS, which is below the threshold for smooth gameplay. The data shows that 1080p is the only resolution where the combo reaches above 60 FPS, and only at Low settings.

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

A: The Arc B390's 3DMark Steel Nomad DX12 score is 1482, placing it in the 9th percentile among all GPUs. Its nearest rivals are the NVIDIA GeForce GT 520MX (1.3% slower), NVIDIA GeForce 800M (1.5% slower), NVIDIA GeForce GT 625 OEM (2.5% slower), and NVIDIA GeForce GT 710 (2.7% slower). These are all very low-end parts, indicating the B390 is positioned at the entry level.

Q: What is the CPU's launch MSRP?

A: The AMD Ryzen 5 2600 had a launch MSRP of $199. This is a fact from the data pack, and no further pricing details are available.

Q: Does the combo rank well among all tested combinations in Rust?

A: No, it ranks 2601 out of 2953 combos, placing it in the bottom 12% of all tested CPU-GPU pairings. This low rank is consistent with the measured FPS results, which show that even at 1080p Low, the combo only achieves 76 FPS, and higher settings drop below playable thresholds.

Q: Is the Intel Arc B390's memory configuration a factor in Rust performance?

A: The B390 uses System Shared memory, meaning it has no dedicated VRAM. Its memory bandwidth is system-dependent, which is a significant limitation in Rust, a game that loads large textures and world data. The GPU's pixel rate is 60.00 GPixel/s and texture rate is 120.0 GTexel/s, but without dedicated memory, the shared system bus becomes a bottleneck, especially at higher resolutions where more texture data is needed.

Resolution Scaling

The measured FPS data reveals a clear pattern of resolution scaling that points to a GPU-limited system at higher resolutions, with CPU limitations emerging at lower ones. At Low settings, the average FPS scales from 76 at 1080p, down to 53 at 1440p, and further down to 31 at 4K. This represents a 59% drop from 1080p to 4K, which is a steep decline. In contrast, at High settings, the average FPS goes from 43 at 1080p, to 30 at 1440p, and 18 at 4K — a 58% drop. These proportional drops suggest that the GPU is the limiting factor at higher resolutions, as the frame rate scales nearly linearly with pixel count.

However, the story changes when comparing settings at the same resolution. At 1080p, the difference between Low (76 FPS) and High (43 FPS) is 33 FPS, which is a 43% reduction. At 4K, the difference between Low (31 FPS) and High (18 FPS) is 13 FPS, a 42% reduction. The similar percentage drops across resolutions indicate that the game's settings are scaling the GPU workload consistently, but the absolute FPS numbers at 4K are too low to be playable regardless of settings.

The Medium settings provide the only frames with min/max data. At 1080p Medium, the average is 51 FPS with a range of 44 to 59 FPS. At 1440p Medium, the average drops to 35 FPS with a range of 30 to 41 FPS. At 4K Medium, the average is 21 FPS with a range of 18 to 24 FPS. This min/max data shows that the frame time variance is consistent across resolutions, with roughly a 15 FPS spread at 1080p, 11 FPS at 1440p, and 6 FPS at 4K. The narrowing range at higher resolutions suggests that the GPU is more consistently saturated, whereas at 1080p the CPU causes more frame time spikes.

The Ultra settings are the most demanding. The combo achieves 33 FPS at 1080p Ultra, 23 FPS at 1440p Ultra, and 13 FPS at 4K Ultra. These are all below the typical 60 FPS target, and even the 30 FPS console-like threshold is barely met at 1080p Ultra. The data indicates that Ultra settings are not viable for this combo in Rust, as even the best case (1080p Ultra at 33 FPS) is not smooth.

The limiting component analysis shows a split personality. At 1080p, the CPU is the primary constraint because the GPU has enough headroom to render frames faster than the CPU can prepare them. At 4K, the GPU becomes the limiter because the pixel workload exceeds what the Arc B390 can handle, regardless of the CPU's capabilities. The crossover point appears to be around 1440p, where both components are stressed. At 1440p Low, the 53 FPS average is the second-best result in the entire dataset, suggesting that this resolution/settings combo is the sweet spot for balancing CPU and GPU loads.

Settings Recommendations

Based on the measured FPS data, the best experience for this combo in Rust is at 1080p Low settings, where the average FPS reaches 76. This is the only settings/resolution combination that hits above the 60 FPS threshold, which is typically considered the minimum for smooth gameplay in a fast-paced survival game. The 76 FPS at 1080p Low provides enough headroom to avoid most frame drops, though the lack of min/max data for this row means we cannot verify frame time consistency.

If you want to increase visual fidelity, 1440p Low at 53 FPS average is the next best option. This sacrifices some frame rate (a 23 FPS drop from 1080p Low) but gains resolution clarity. At 1440p, the game will look sharper, and 53 FPS is still playable for a survival game where reaction times matter less than in competitive shooters. The 1080p Medium at 51 FPS average is nearly identical in performance to 1440p Low, but the resolution trade-off is different. If you prefer higher settings over higher resolution, 1080p Medium offers a 44 FPS minimum, which is acceptable.

The Medium preset provides the most balanced experience across all resolutions. At 1080p Medium, the 51 FPS average with a 44 FPS minimum ensures that even in heavy scenes, the frame rate won't drop below playable levels. At 1440p Medium, the 35 FPS average with a 30 FPS minimum is borderline, but some players may accept it for the visual upgrade. The 4K Medium at 21 FPS average is not recommended for any playable experience.

The High and Ultra presets are not recommended for this combo. At 1080p High, the 43 FPS average is below the smooth threshold, and at 1080p Ultra, the 33 FPS average is barely playable. The data shows that the performance drop from Medium to High is significant (51 to 43 FPS at 1080p, a 16% reduction), while the drop from High to Ultra is even steeper (43 to 33 FPS at 1080p, a 23% reduction). These diminishing returns suggest that the High and Ultra presets add GPU workload without providing proportional visual benefits for this hardware.

The best overall recommendation is 1080p Low for maximum performance, with 1440p Low as a viable alternative if you prioritize resolution over frame rate. The 1080p Medium preset is the highest quality setting that maintains a 44 FPS minimum, which is acceptable for Rust's gameplay loop. Avoid 4K entirely, as even the Low preset at 4K only achieves 31 FPS, which is below the threshold for a responsive experience.

How This Combo Ranks

The AMD Ryzen 5 2600 + Intel Arc B390 combination ranks 2601 out of 2953 tested combos in Rust. This places it in the bottom 12% of all tested configurations, which is consistent with the low percentile ranking of the GPU (9th percentile among all GPUs) and the modest 75th percentile ranking of the CPU. The combo's rank is driven primarily by the GPU's weak performance, as the Arc B390's 3DMark Steel Nomad score of 1482 is in the single-digit percentile.

To contextualize this rank, consider that there are 352 combos ranked below this one. The combo outperforms systems with even weaker GPUs, but it is outclassed by the vast majority of tested configurations. The CPU's nearest rivals — the Intel Core Ultra 5 228V, Intel Core i9-11900H, Intel Xeon D-1746TER, and AMD EPYC 9454 — all have average benchmark scores within 1.2% of the Ryzen 5 2600, meaning the CPU is not the primary reason for the low rank. Instead, the GPU's position relative to its rivals (GT 520MX, GeForce 800M, GT 625 OEM, GT 710) shows that the Arc B390 is competing with decade-old entry-level parts.

The rank of 2601 means that in Rust, this combo will struggle with any settings above Low or Medium at 1080p. The measured FPS data supports this, as the combo only achieves 76 FPS at 1080p Low, which is the bare minimum for a decent experience. The combination of a mid-range 2018 CPU with an entry-level 2026 GPU creates a mismatch where the CPU is capable of more, but the GPU holds the system back. This is evidenced by the fact that the CPU's benchmark scores are competitive with much newer processors (within 1.2% of the EPYC 9454), yet the combo's game performance is limited by the GPU's 9th percentile standing.

For context, the combo rank of 2601 out of 2953 means that 88% of tested combinations outperform it in Rust. This is not a system for competitive play or high-fidelity gaming. It is suitable for low-settings gaming at 1080p or casual play at 1440p with reduced quality. The data shows no scenario where this combo achieves a consistently smooth 60 FPS experience, which is a significant limitation for a game like Rust that benefits from responsive controls.

Measured FPS Breakdown

1920x1080 (1080p)

| Settings | Average FPS | Min FPS | Max FPS |

|----------|-------------|---------|---------|

| Low | 76 | - | - |

| Medium | 51 | 44 | 59 |

| High | 43 | - | - |

| Ultra | 33 | - | - |

At 1080p, the combo shows a clear performance hierarchy. Low settings deliver 76 FPS, which is the only result above 60 FPS in the entire dataset. Medium settings drop to 51 FPS average with a 44 FPS minimum and 59 FPS maximum, indicating reasonable frame time consistency. High settings reduce the average to 43 FPS, and Ultra drops further to 33 FPS. The 33 FPS gap between Low and Ultra at 1080p demonstrates that the GPU struggles with higher-quality presets even at the lowest resolution.

2560x1440 (1440p)

| Settings | Average FPS | Min FPS | Max FPS |

|----------|-------------|---------|---------|

| Low | 53 | - | - |

| Medium | 35 | 30 | 41 |

| High | 30 | - | - |

| Ultra | 23 | - | - |

At 1440p, the performance drops significantly from 1080p. Low settings average 53 FPS, which is still playable but not smooth. Medium settings average 35 FPS with a 30 FPS minimum, which is borderline for acceptable gameplay. High settings drop to 30 FPS, and Ultra falls to 23 FPS. The 30 FPS minimum at Medium settings is the only min/max data point at this resolution, showing that the frame rate can dip to levels that may cause noticeable stutter.

3840x2160 (4K)

| Settings | Average FPS | Min FPS | Max FPS |

|----------|-------------|---------|---------|

| Low | 31 | - | - |

| Medium | 21 | 18 | 24 |

| High | 18 | - | - |

| Ultra | 13 | - | - |

At 4K, the combo is not viable for gameplay. Low settings average 31 FPS, which is below the 30 FPS threshold for smoothness. Medium settings average 21 FPS with an 18 FPS minimum, making the game feel sluggish. High settings drop to 18 FPS, and Ultra falls to 13 FPS. The Medium preset at 4K provides the only min/max data, with a tight range of 18 to 24 FPS, indicating that the GPU is fully saturated and frame times are relatively consistent, but the overall performance is too low for practical use.

The data shows a consistent pattern: each step up in settings costs roughly 20-25% performance at any given resolution, and each step up in resolution costs roughly 30-40% performance at any given settings level. This means that the combo is best used at 1080p with Low or Medium settings, and any attempt to push higher resolutions or settings results in a disproportionately large FPS loss.