Roblox

The Intel Core i5-9400 paired with the Intel Arc B580 delivers strong frame rates in Roblox across all tested resolutions and presets. The recorded data shows that this combination never dips below 60 FPS in any of the measured scenarios, making it a capable setup for the game. At 1920x1080, even the most demanding Ultra preset produces an average of 189.9 FPS, while the lowest preset reaches 292.6 FPS. The performance scales predictably with resolution, with 2560x1440 and 3840x2160 still maintaining substantial headroom above the playable threshold.

Measured FPS Breakdown

At 1920x1080, the measurements show consistently high frame rates regardless of the graphics preset. The Low preset averages 292.6 FPS, which is the highest recorded value for this resolution. Moving to Medium, the average drops to 265.6 FPS, a reduction of about 9% from Low. The High preset delivers 235.6 FPS on average, while the Ultra preset, which applies the most demanding settings, still produces 189.9 FPS. All four presets at this resolution clear the 60 FPS playable threshold by a wide margin, and the gap between the lowest and highest preset is 102.7 FPS, showing that the hardware has ample performance to spare even at the most demanding settings.

At 2560x1440, the frame rates remain high but show a clear step down from 1080p. The Low preset averages 200.1 FPS, which is 92.5 FPS lower than the same preset at 1080p. Medium follows at 180.3 FPS, High at 155.7 FPS, and Ultra at 129.0 FPS. The scaling from 1080p to 1440p is consistent: each preset loses between 60 and 92 FPS, with the Ultra preset showing the smallest absolute drop of 60.9 FPS. Even at the most demanding settings, the average of 129.0 FPS is more than double the 60 FPS threshold, indicating no risk of stutter or slowdown in typical gameplay.

At 3840x2160, the highest resolution tested, the performance remains well above playable levels. The Low preset averages 109.5 FPS, Medium at 101.3 FPS, High at 93.1 FPS, and Ultra at 70.8 FPS. The drop from 1440p to 4K is significant for every preset: Low loses 90.6 FPS, Medium loses 79.0 FPS, High loses 62.6 FPS, and Ultra loses 58.2 FPS. The Ultra preset at 4K is the only scenario where the average dips below 100 FPS, but at 70.8 FPS it still exceeds the 60 FPS threshold by a comfortable margin. The data shows that the Ultra preset at 4K is the most demanding combination tested, yet it remains playable.

Across all resolutions, the pattern is consistent: Low presets always yield the highest frame rates, followed by Medium, High, and Ultra in descending order. The delta between Low and Ultra grows with resolution: at 1080p the gap is 102.7 FPS, at 1440p it is 71.1 FPS, and at 4K it is 38.7 FPS. This indicates that at higher resolutions, the GPU becomes more of a limiting factor, compressing the performance differences between presets.

Similar Performance Alternatives

Looking at the nearest rivals in the database, the Intel Core i5-9400 sits in a tight cluster of CPUs with very similar average benchmark scores. The closest competitor is the Intel Core i3-10305, which scores 2264 on average, a difference of 0.4% from the i5-9400’s 2254. The Intel Core i7-1068NG7 scores 2259, just 0.2% higher, while the Intel Core i7-10710U scores 2248, 0.3% lower. The AMD Ryzen 5 PRO 1500 rounds out the group at 2246, 0.4% lower. In practice, any of these CPUs would deliver nearly identical frame rates in Roblox, since the game’s engine is unlikely to stress six-thread processors to their limits at the settings tested. The i5-9400’s percentile ranking of 47 means it sits just below the median of all CPUs in the database, but for this title, the measured FPS data shows no CPU bottleneck at any resolution.

For the GPU, the Intel Arc B580 has an average benchmark score of 23021, placing it in the 68th percentile of all graphics cards. Its nearest rivals are remarkably close in aggregate performance. The AMD Radeon RX 580 2048SP scores 23061, just 0.2% higher, while the NVIDIA GeForce RTX 2080 scores 22895, 0.6% lower. The NVIDIA GeForce RTX 3080 scores 23172, 0.7% higher, and the NVIDIA P106-100 scores 23249, 1.0% higher. These deltas are all within 1%, meaning that swapping the Arc B580 for any of these cards would produce nearly identical frame rates in Roblox. The RTX 3080, despite being a much more powerful card in other workloads, only edges out the Arc B580 by 0.7% in the aggregate benchmark, which translates to a negligible difference in this game. Users with any of these GPUs should expect similar performance at the same settings and resolutions.

The combination of the i5-9400 and the Arc B580 ranks 2837 out of 3711 tested combos in Roblox specifically, placing it in the lower-middle portion of the database. However, this ranking reflects the fact that many higher-end combinations exist, not that this setup struggles with the game. The measured FPS data is the authoritative source: every tested preset at every resolution exceeds 60 FPS, and most exceed 100 FPS.

CPU and GPU Roles

The data shows that the GPU is the primary driver of frame rate differences between presets at any given resolution. When moving from Low to Ultra at 1080p, the average FPS drops from 292.6 to 189.9, a 35% reduction. At 1440p, the same preset change reduces FPS from 200.1 to 129.0, a 36% drop. At 4K, the change is from 109.5 to 70.8, a 35% reduction. The consistency of this percentage across resolutions indicates that the graphics settings are taxing the GPU uniformly, and the CPU is not introducing variable bottlenecks.

The CPU’s role becomes more apparent when looking at resolution scaling. At the Low preset, moving from 1080p to 1440p reduces FPS by 92.5, and from 1440p to 4K reduces it by another 90.6. At the Ultra preset, the same resolution steps reduce FPS by 60.9 and 58.2 respectively. The fact that the absolute FPS drops are similar between Low and Ultra when scaling resolution suggests that the CPU is capable of feeding the GPU at all settings, but the GPU’s workload increases with resolution, limiting output. Since the i5-9400 has six cores and six threads with a boost clock of 4.10 GHz, it provides enough single-thread performance for Roblox’s physics and scripting, while the Arc B580’s 13.67 TFLOPS of FP32 compute handles the rendering load.

If the CPU were the limiting factor, we would expect to see larger FPS gaps between presets at lower resolutions, where the GPU has more headroom. Instead, the percentage drop from Low to Ultra is nearly identical across all three resolutions (around 35%), which indicates a GPU-bound scenario in all cases. Even at 4K Ultra, the 70.8 FPS average shows that the CPU is not holding back the GPU, as the frame rate is still well above the 60 FPS threshold. The database’s verdict lists all four presets as playable at every resolution, which is consistent with a balanced pairing where the GPU is the main performance determinant.

FAQ

Q: Can this PC run Roblox at 1920x1080 with the Ultra preset?

A: Yes. The measured average FPS at 1080p Ultra is 189.9, which is more than triple the 60 FPS playable threshold. The database lists Ultra as playable at this resolution.

Q: What is the highest resolution that maintains 60 FPS on the Ultra preset?

A: All three tested resolutions maintain 60 FPS on Ultra. At 3840x2160 Ultra, the average is 70.8 FPS; at 2560x1440 Ultra, it is 129.0 FPS; and at 1920x1080 Ultra, it is 189.9 FPS.

Q: How much performance is lost when moving from 1080p to 4K on the same preset?

A: At the Low preset, the average drops from 292.6 FPS at 1080p to 109.5 FPS at 4K, a loss of 183.1 FPS. At the Ultra preset, the average drops from 189.9 FPS to 70.8 FPS, a loss of 119.1 FPS.

Q: Is the Intel Core i5-9400 a bottleneck for the Intel Arc B580 in Roblox?

A: The data does not indicate a CPU bottleneck. Frame rates scale smoothly with resolution and settings, and all presets exceed 60 FPS. The CPU’s nearest rival, the Intel Core i3-10305, differs by only 0.4% in average benchmark score, showing the i5-9400 is adequate for this title.

Q: How does the Intel Arc B580 compare to the NVIDIA GeForce RTX 2080 in aggregate performance?

A: The Arc B580 scores 23021 on average, while the RTX 2080 scores 22895. The RTX 2080 is 0.6% lower, meaning the two GPUs deliver virtually identical performance in overall benchmarks.

Q: What is the least demanding preset that still provides a high frame rate at 1440p?

A: The Low preset at 1440p averages 200.1 FPS, which is the highest recorded value at that resolution. The Medium preset is close at 180.3 FPS, and even Ultra exceeds 120 FPS.

The Verdict

This PC can run Roblox at all tested resolutions and presets with frame rates well above the 60 FPS playable threshold. The database’s verdict lists every setting as playable at every resolution, which is rare for demanding titles. At 1920x1080, the lowest measured average is 189.9 FPS on Ultra, and the highest is 292.6 FPS on Low. At 2560x1440, the range is from 129.0 FPS on Ultra to 200.1 FPS on Low. At 3840x2160, the range is from 70.8 FPS on Ultra to 109.5 FPS on Low.

The only scenario that approaches the 60 FPS boundary is 4K Ultra at 70.8 FPS, but it still clears the threshold by nearly 11 FPS. For users with 1080p or 1440p monitors, this system will deliver buttery-smooth gameplay at any preset, with enough headroom to handle sudden on-screen action or complex user-generated worlds. The combination ranks 2837 out of 3711 combos in the database, but that ranking is skewed by many higher-end systems; in absolute terms, the measured FPS data shows this is a very capable Roblox machine.

Best Settings per Resolution

At 1920x1080, the Ultra preset is the best choice. It averages 189.9 FPS, which is still far above the 60 FPS threshold, and it provides the maximum visual fidelity. There is no reason to lower settings at this resolution, as even the most demanding preset leaves massive performance headroom.

At 2560x1440, the Ultra preset is also the recommended setting. The average of 129.0 FPS is more than double the playable threshold, so users can enjoy the highest quality without sacrificing smoothness. The High preset at 155.7 FPS is an alternative for those who prefer even higher refresh rates, but Ultra remains comfortably playable.

At 3840x2160, the Ultra preset averages 70.8 FPS, which clears the 60 FPS threshold but with less margin than at lower resolutions. For users who want the best possible visuals on a 4K display, Ultra is viable. If a higher frame rate is preferred, the High preset at 93.1 FPS provides a 31% performance boost over Ultra, while the Medium preset at 101.3 FPS and Low at 109.5 FPS offer even more headroom. The database lists all four presets as playable at 4K, so the choice depends on whether the user prioritizes visual quality or maximum frame rate. For most 4K displays with a 60 Hz refresh rate, Ultra is the optimal balance, as the 70.8 FPS average exceeds the display’s refresh rate.