Rust

Rust is a notoriously CPU-bound survival game, but this mobile combo—the AMD Ryzen 9 8945HX paired with the NVIDIA GeForce RTX 4080 Mobile—shows a more balanced profile at higher resolutions. The benchmark data reveals a system that can push past 200 FPS at 1080p Low but falls to a playable 36 FPS at 4K Ultra, with the scaling pattern indicating where the bottleneck shifts between the processor and the graphics card.

Resolution Scaling

The measured FPS data shows clear and predictable scaling as resolution increases, but the rate of the drop tells you which component is in charge. At 1080p Low, the combo produces 207 FPS. Moving to 1440p Low drops that to 142 FPS—a 31% reduction. At 4K Low, the score falls to 84 FPS, another 41% cut from the 1440p figure. This steep decline from 1080p to 4K is the signature of a system where the GPU is becoming the limiting factor as pixel count rises.

However, the picture changes when you look at the High preset. At 1080p High, the average is 117 FPS. At 1440p High, it's 81 FPS (a 31% drop), and at 4K High, it's 48 FPS (a 41% drop from 1440p). The percentage losses are nearly identical between Low and High presets across resolutions, which suggests the scaling is resolution-driven rather than settings-driven. The Ryzen 9 8945HX has enough headroom to keep the GPU fed at 1080p, but the RTX 4080 Mobile's workload grows faster than the CPU's when pixels quadruple from 1080p to 4K.

The Medium preset provides the only complete min/max data in the pack. At 1080p Medium, the average is 139 FPS with a min of 118 and max of 159. At 1440p Medium, the average drops to 95 FPS (min 81, max 110). At 4K Medium, the average falls to 56 FPS (min 48, max 65). The min-to-max spread widens slightly at higher resolutions—41 FPS at 1080p, 29 FPS at 1440p, and 17 FPS at 4K. This narrowing range at 4K indicates the GPU is consistently saturated, leaving less variance between frames. At 1080p, the CPU can occasionally burst ahead, creating larger frame time swings.

Ultra settings tell the harshest story. At 1080p Ultra, the combo manages 89 FPS. That falls to 61 FPS at 1440p Ultra, and 36 FPS at 4K Ultra. The 4K Ultra result is barely above the 30 FPS threshold for console-like playability, and the 53% drop from 1080p to 4K on Ultra is the steepest of any preset. This suggests that Ultra settings in Rust introduce effects that disproportionately hammer the GPU, making the 4080 Mobile the clear ceiling at this resolution.

GPU Role

The NVIDIA GeForce RTX 4080 Mobile in this combo carries 12 GB of GDDR6 memory on a 192-bit bus, yielding 432.0 GB/s of bandwidth. The GPU's boost clock is 1665 MHz, with a base clock of 1290 MHz. These specs place it in the 81st percentile of all GPUs in the database, though its average benchmark score of 38135 is notable for being closely matched by several rivals with very different positioning.

The nearestRivals data shows the RTX 4080 Mobile sits within a tight cluster. The NVIDIA GeForce MX570 scores 38299, just 0.4% higher. The RTX 5080 Mobile scores 38349, only 0.6% higher. The desktop RTX 4070 scores 37648, which is 1.3% lower, and the Tesla P4 scores 37628, also 1.3% lower. This clustering is unusual—the mobile 4080 is effectively trading blows with a low-end mobile GPU and a desktop mid-ranger in synthetic tests. In Rust specifically, the measured FPS data shows this GPU is capable of 84 FPS at 4K Low, which indicates the 12 GB VRAM is sufficient for the game's textures at that resolution, but the 36 FPS at 4K Ultra suggests the shader and post-processing loads are what cripple the card, not memory capacity.

The GPU's 7424 shading units and 232 tensor cores are backed by 58 RT cores, but Rust does not heavily leverage ray tracing in the measured presets. The 80 ROPs and 232 TMUs provide a pixel rate of 133.2 GPixel/s and a texture rate of 386.3 GTexel/s. These figures explain why the card scales poorly to 4K Ultra—the pixel fill rate is sufficient for lower presets, but the texture rate becomes a bottleneck when Ultra settings increase the number of high-res textures per frame.

The fact that the RTX 4080 Mobile's average benchmark score is only 0.6% below the RTX 5080 Mobile—a newer part—suggests the 4080 Mobile is punching above its weight in synthetic tests, but the measured Rust data shows real-world behavior where the 4K Ultra result (36 FPS) is the weakest link. The GPU's 110 W TDP is generous for a mobile part, allowing it to sustain boost clocks longer, which is reflected in the 4K Medium result of 56 FPS (min 48, max 65) showing stability rather than thermal throttling.

FAQ

Q: Can this combo run Rust at 4K with playable framerates?

A: Yes, but only at lower presets. At 4K Low, the average FPS is 84, which is smooth. At 4K Medium, it drops to 56 FPS (min 48, max 65), which is still playable. At 4K High, the average falls to 48 FPS, and at 4K Ultra, it's 36 FPS—borderline for competitive play.

Q: Is the CPU or GPU the bottleneck at 1080p?

A: At 1080p Low, the combo hits 207 FPS, which is far beyond the refresh rate of most laptop displays. At 1080p High, it manages 117 FPS. The Ryzen 9 8945HX, with its 16 cores and 32 threads, is not the limiting factor at this resolution; the GPU is still able to push well over 100 FPS on most presets.

Q: How does the RTX 4080 Mobile compare to the desktop RTX 4070 in this game?

A: The nearestRivals data shows the RTX 4080 Mobile has an average benchmark score of 38135, which is 1.3% higher than the desktop RTX 4070's 37648. In Rust, the measured FPS indicates the mobile 4080 is capable of 207 FPS at 1080p Low, suggesting it can outperform that desktop card in CPU-bound scenarios.

Q: What is the best preset for a 1440p monitor?

A: The 1440p High preset delivers 81 FPS, which is ideal for a 144Hz display. If you need higher framerates, 1440p Low hits 142 FPS, but the visual compromise may not be worth it. The 1440p Medium preset offers 95 FPS (min 81, max 110), a good middle ground.

Q: Does the 12 GB VRAM cause issues at 4K Ultra?

A: The data does not indicate VRAM capacity as the limiting factor. The 4K Ultra result of 36 FPS is more likely due to the GPU's compute throughput, as the 432.0 GB/s bandwidth and 24.72 TFLOPS FP32 performance are insufficient for the highest settings at that resolution.

Q: Is this combo better than the average tested system for Rust?

A: The combo ranks 1167 out of 3723 tested combos, placing it in the top 31% of all configurations. This is a solid result, but not elite—the CPU's 95th percentile and GPU's 81st percentile suggest the pairing is well-matched but the GPU holds the combo back from higher rankings.

Measured FPS Breakdown

At 1920x1080, the combo delivers its best results. The Low preset averages 207 FPS, which is the highest measured score across all resolutions and settings. Medium averages 139 FPS with a range of 118 to 159 FPS. High averages 117 FPS, and Ultra averages 89 FPS. The gap between Low and Ultra is 118 FPS, or 57%, indicating that Ultra settings impose a significant load on the GPU even at 1080p.

At 2560x1440, the numbers scale down proportionally. Low averages 142 FPS, Medium 95 FPS (min 81, max 110), High 81 FPS, and Ultra 61 FPS. The drop from 1080p to 1440p on each preset is roughly 31-32%, which is consistent with the pixel count increase of 78%. The fact that FPS doesn't drop by the full 78% suggests the game is still partially CPU-bound at 1440p, especially on the Low preset where the 142 FPS result indicates the GPU has headroom.

At 3840x2160, the GPU becomes the clear bottleneck. Low averages 84 FPS, Medium 56 FPS (min 48, max 65), High 48 FPS, and Ultra 36 FPS. The 4K Low result of 84 FPS is impressive for a mobile GPU, but the Ultra result of 36 FPS shows the limits of the 4080 Mobile. The scaling from 1440p to 4K on each preset is a 41% drop, which is less than the 125% pixel increase, but the absolute numbers at 4K Ultra fall below the 60 FPS threshold most gamers prefer.

The Medium preset is the only one with complete min/max data across all resolutions. At 1080p, the spread is 41 FPS (118 to 159). At 1440p, the spread is 29 FPS (81 to 110). At 4K, the spread is 17 FPS (48 to 65). This tightening range at higher resolutions confirms the GPU is the limiting factor—at 1080p, the CPU's variable load creates larger frame time swings, while at 4K, the GPU's consistent saturation smooths out the variance.

How This Combo Ranks

The comboRankInGame places this configuration at 1167 out of 3723 tested combos, which puts it in the 68.6th percentile of all systems tested for Rust. This is a strong showing, but not a top-tier result. The CPU, AMD Ryzen 9 8945HX, sits in the 95th percentile of all CPUs, with an average benchmark score of 76212. Its nearest rivals are the Intel Core Ultra 9 285HX (76155, 0.1% higher), AMD EPYC Embedded 8224P (76492, 0.4% lower), AMD Ryzen Threadripper PRO 9945WX (76513, 0.4% lower), and AMD Ryzen 9 9950X3D (75779, 0.6% higher). This clustering shows the 8945HX is within 1% of several top-tier desktop and mobile parts.

The GPU, RTX 4080 Mobile, sits in the 81st percentile, with an average benchmark score of 38135. Its nearest rivals are oddly matched: the MX570 (38299, 0.4% higher), RTX 5080 Mobile (38349, 0.6% higher), RTX 4070 (37648, 1.3% lower), and Tesla P4 (37628, 1.3% lower). The wide disparity in these rivals—from a low-end mobile chip to a desktop mid-ranger—suggests the RTX 4080 Mobile's synthetic scores are heavily influenced by its mobile power constraints.

The rank of 1167 suggests that while the CPU is elite, the GPU holds the combo back from the top 1000. In Rust, which can be CPU-heavy in busy servers, the 8945HX's 16 cores and 32 threads provide ample headroom, but the GPU's 4K performance caps the overall ranking. The 68.6th percentile placement means this combo outperforms most laptops and many desktops, but it's not a leaderboard-topper.

Settings Recommendations

For a 1080p display, the High preset at 117 FPS is the best balance of visual quality and performance. The Ultra preset at 89 FPS is still smooth, but the 24% performance hit from High to Ultra may not be justified by the visual improvements. The Low preset at 207 FPS is only useful for competitive play where maximum framerate matters more than graphics.

For a 1440p display, the Medium preset at 95 FPS (min 81, max 110) is the recommended choice. It delivers a smooth experience that stays above 80 FPS in the worst case, while the High preset at 81 FPS is also viable if you prefer better visuals. The Low preset at 142 FPS is overkill for most 144Hz monitors, and the Ultra preset at 61 FPS is borderline—it works, but the minimum framerate may drop below 60 in busy scenes.

For a 4K display, the Low preset at 84 FPS is the only option that provides a consistently smooth experience. The Medium preset at 56 FPS (min 48, max 65) is playable but may exhibit noticeable stuttering during intense moments. The High preset at 48 FPS and Ultra at 36 FPS are not recommended for serious gameplay, as they fall below the 60 FPS threshold. If you have a 4K display, stick to Low or Medium settings to maintain playability.

The data shows the sweet spot for this combo is 1440p Medium to High, where the Ryzen 9 8945HX can keep the GPU well-fed without hitting the 4K wall. The 95th percentile CPU pairs well with the 81st percentile GPU, but the GPU's 4K limitations mean you should prioritize resolution over settings if you're targeting 4K. For most users, a 1440p monitor with High settings will deliver the best experience, combining the CPU's strength with the GPU's mid-range capabilities.