Roblox

Measured FPS Breakdown

At 3840x2160, the AMD Ryzen 7 5800XT with Intel Arc B390 delivers an average of 52 FPS on High settings, with no recorded minimum or maximum values. Dropping to Low settings raises the average to 64 FPS, which is the only preset at this resolution that crosses the 60 FPS playability threshold. Medium settings produce an average of 59 FPS, with a minimum of 50 FPS and a maximum of 67 FPS, indicating noticeable frame dips during intensive scenes. Ultra settings are the most demanding, yielding an average of just 42 FPS, which falls well short of smooth gameplay.

Moving to 2560x1440, the performance picture improves substantially. High settings achieve an average of 92 FPS, while Low settings reach 114 FPS. Medium settings average 104 FPS, with a minimum of 88 FPS and a maximum of 119 FPS, showing tight frame pacing. Ultra settings at this resolution deliver an average of 74 FPS, which is comfortably above the 60 FPS threshold, making this resolution viable across all presets.

At 1920x1080, the combination performs at its strongest. High settings average 137 FPS, Low settings hit 171 FPS, and Medium settings land at 155 FPS with a minimum of 132 FPS and a maximum of 179 FPS. Ultra settings still manage a robust 111 FPS average, demonstrating that this hardware has ample headroom for 1080p gaming. The scaling from 1440p to 1080p shows a consistent gain of roughly 45 to 57 FPS across presets, confirming that the GPU is the primary limiter at higher resolutions.

CPU and GPU Roles

The data reveals a clear division of labor between the AMD Ryzen 7 5800XT and the Intel Arc B390. At 3840x2160, the GPU is overwhelmingly the bottleneck. The gap between Low (64 FPS) and Ultra (42 FPS) is 22 FPS, and even the best preset barely clears 60 FPS. This indicates that pixel throughput and shading work dominate, leaving the CPU with relatively little influence on the final frame rate.

At 2560x1440, the balance shifts slightly. The spread from Low (114 FPS) to Ultra (74 FPS) is 40 FPS, showing that the GPU still governs performance, but the CPU begins to contribute more. The 5800XT's eight cores and 16 threads, with a boost clock of 4.80 GHz, provide enough headroom to feed the GPU at these moderate resolutions, yet the Arc B390's modest shading units (1536) limit absolute frame rates.

At 1920x1080, the CPU becomes a more visible partner. The difference between Low (171 FPS) and Ultra (111 FPS) is 60 FPS, but even the most demanding preset stays far above 60 FPS. This suggests that the Ryzen 7 5800XT can push frame rates higher than the Arc B390 can render at lower resolutions, but the GPU still caps the ceiling. The 3DMark single-thread score of 959 and multi-thread score of 7680 for the CPU indicate strong per-core performance, which helps maintain consistent frame delivery in Roblox's physics and scripting workloads.

Comparing across resolutions, the average FPS at 1080p Ultra (111 FPS) versus 2160p Ultra (42 FPS) shows a 2.6x difference, closely matching the pixel count ratio. This linear scaling confirms that the GPU's fill rate and shading capacity are the dominant factors, while the CPU's role diminishes as resolution rises.

FAQ

Q: Can this PC run Roblox at 4K?

A: At 3840x2160, only Low settings reach the 60 FPS threshold, averaging 64 FPS. Medium averages 59 FPS, High averages 52 FPS, and Ultra averages 42 FPS, so higher presets require a resolution drop for smooth play.

Q: What is the best preset for 1440p?

A: Ultra settings at 2560x1440 average 74 FPS, which clears the 60 FPS playability threshold. This is the most demanding preset that remains playable at this resolution.

Q: How does the CPU compare to its nearest rivals?

A: The Ryzen 7 5800XT has an average benchmark score of 29879. It is within 0.3% of the AMD Ryzen 7 8845HS (29955) and AMD Ryzen 7 7840HS (29955), and 0.6% ahead of the AMD Ryzen 5 9600X (29713). The AMD Ryzen 7 7840H scores 29868, essentially identical.

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

A: The Intel Arc B390 scores 1482 in 3DMark Steel Nomad DX12. It is 1.3% ahead of the NVIDIA GeForce GT 520MX (1463), 1.5% ahead of the GeForce 800M (1460), 2.5% ahead of the GT 625 OEM (1446), and 2.7% ahead of the GT 710 (1443). These are all closely matched, low-tier graphics solutions.

Q: Is 1080p Ultra playable?

A: Yes, 1920x1080 Ultra averages 111 FPS, which is well above the 60 FPS threshold. Even the minimum recorded frame rate at Medium (132 FPS) indicates consistent performance.

Q: What frame rates can I expect at 1080p Medium?

A: The measured average is 155 FPS, with a minimum of 132 FPS and a maximum of 179 FPS. This preset offers the best combination of visual fidelity and frame rate headroom at 1080p.

The Verdict

The data confirms that this combination can run Roblox successfully, but the experience depends heavily on resolution. At 3840x2160, only Low settings achieve playable frame rates, averaging 64 FPS. Medium falls just short at 59 FPS, while High (52 FPS) and Ultra (42 FPS) are below the 60 FPS threshold. For 4K gaming, users must accept reduced visual quality.

At 2560x1440, all four presets exceed 60 FPS. High averages 92 FPS, Low averages 114 FPS, Medium averages 104 FPS, and Ultra averages 74 FPS. The verdict is clear: 1440p is the sweet spot for this hardware, allowing Ultra settings with a 14 FPS margin above the playability threshold.

At 1920x1080, every preset delivers well over 60 FPS. Ultra averages 111 FPS, High averages 137 FPS, Medium averages 155 FPS, and Low averages 171 FPS. This resolution provides the most comfortable experience, with no risk of dropping below playable frame rates. The combination of the Ryzen 7 5800XT and Arc B390 is fully capable for Roblox at 1080p and 1440p, while 4K demands a conservative preset.

Similar Performance Alternatives

For the CPU, the nearest rivals in the database are all within a fraction of a percent in average benchmark score. The AMD Ryzen 7 7840H (29868), AMD Ryzen 7 8845HS (29955), and AMD Ryzen 7 7840HS (29955) are essentially equivalent in performance, with deltas of 0% and -0.3%. The AMD Ryzen 5 9600X (29713) trails by 0.6%. Any of these processors would deliver nearly identical frame rates in Roblox when paired with the same GPU, as the game is not heavily multithreaded, and the 5800XT's single-thread score of 959 is representative of this class.

For the GPU, the Intel Arc B390's nearest rivals are all older, low-end NVIDIA parts. The GeForce GT 520MX (1463) is 1.3% slower, the GeForce 800M (1460) is 1.5% slower, the GT 625 OEM (1446) is 2.5% slower, and the GT 710 (1443) is 2.7% slower. These deltas are small enough that users would see comparable Roblox performance, though none of these GPUs have the same modern feature set, such as DirectX 12 Ultimate and Vulkan 1.4 support. In practice, the Arc B390 and its rivals all sit near the 9th percentile of all GPUs, meaning they are entry-level solutions where Roblox's low graphical demands are the only reason playable frame rates are achievable.

Best Settings per Resolution

At 3840x2160, the most demanding preset that stays at or above 60 FPS is Low, which averages 64 FPS. Medium falls just below the threshold at 59 FPS, so it is not recommended for a consistent experience. Users targeting 4K should stick with Low settings.

At 2560x1440, Ultra is the best choice, averaging 74 FPS. This provides the highest visual quality while maintaining a comfortable margin above the 60 FPS threshold. Lower presets offer higher frame rates but no additional visual benefit for most players.

At 1920x1080, Ultra is again the best setting, averaging 111 FPS. This delivers the full visual experience with a 51 FPS buffer above the playability threshold, ensuring smooth gameplay even in complex scenes. Medium (155 FPS) and High (137 FPS) are also excellent choices for those prioritizing frame rate over eye candy, but Ultra is the clear recommendation.

How This Combo Ranks

The combination of the AMD Ryzen 7 5800XT and Intel Arc B390 ranks 3289 out of 3711 tested combos in Roblox, placing it in the lower 11th percentile of all configurations. This low ranking is driven almost entirely by the GPU, which sits at the 9th percentile among all GPUs, while the CPU ranks at the 81st percentile among all CPUs. The pairing of a strong processor with a weak graphics card creates a significant imbalance for Roblox, which relies more on GPU rendering than CPU physics at higher resolutions.

Despite the low overall rank, the measured frame rates show that this combo is perfectly playable at 1080p and 1440p. The rank reflects the hardware's position relative to all other tested configurations, many of which include far more powerful GPUs. For Roblox specifically, the data indicates that the CPU has ample headroom, as evidenced by the 81st percentile standing, but the GPU's 9th percentile position caps the potential. Users with this combo should prioritize resolution and preset selection based on the GPU's limitations, as the CPU will not be the limiting factor in any scenario.