Roblox

The Intel Core i5-9400 and AMD Radeon RX 6750 XT combination delivers exceptional performance in Roblox, a Sandbox title where the data shows this pairing is capable of far exceeding standard display refresh rates across nearly all tested configurations. The measured frame rates are consistently high, indicating that users have significant headroom to prioritize visual fidelity without compromising smoothness.

Settings Recommendations

The benchmark data indicates that the Ultra preset is the optimal choice for this specific hardware combination, as it provides the most visually demanding experience while still maintaining frame rates well above playable thresholds. At 1920x1080, the Ultra preset delivers an average of 254.7 FPS, which is a substantial 51.1% higher than the 60 FPS standard and leaves ample performance for potential future content updates or background tasks. While the High preset at the same resolution pushes performance to 307.7 FPS, the visual gains from Ultra settings in Roblox are generally more pronounced than the marginal FPS difference.

For users with 1440p displays, the Ultra preset remains viable, producing 169 FPS average, which is still comfortably high. However, the more demanding nature of the resolution means that the drop from High to Ultra costs roughly 39.8 FPS, a reduction of about 19%. At 4K, the Ultra preset dips to 95.8 FPS, which is still playable but represents a significant compromise compared to the lower resolutions. The data suggests that the Medium preset at 4K, yielding 133.5 FPS, offers a better balance for high-resolution displays, as the visual difference between Medium and Ultra in Roblox is less critical than the frame rate penalty incurred.

The Low preset produces the highest frame rates across all resolutions, peaking at 387.2 FPS at 1080p, but this configuration is generally unnecessary given the performance headroom available. The 12 GB of VRAM on the GPU is more than sufficient for the game's textures, making the Low preset's performance advantage less relevant for playability. The measured data supports the conclusion that Ultra at 1080p or 1440p, or Medium at 4K, are the configurations that best leverage the hardware's capabilities.

GPU Role

The AMD Radeon RX 6750 XT plays a central role in this combination's performance, given the relatively modest demands of Roblox on the CPU. The GPU's 12 GB of GDDR6 memory on a 192-bit bus provides 432.0 GB/s of bandwidth, which is more than adequate for the game's asset streaming. The card's boost clock of 2600 MHz and game clock of 2495 MHz, based on the RDNA 2.0 architecture, deliver robust raw throughput for the game's rendering pipeline.

The GPU's benchmark scores reinforce its capability. Its Passmark G3D score of 20700 and 3DMark Steel Nomad DX12 score of 2548 place it in the 79th percentile of all GPUs, indicating strong performance relative to other graphics cards. The data shows that the GPU is the primary driver of the high frame rates observed, particularly at lower resolutions where the CPU has ample headroom. The card's 2560 shading units and 64 ROPs ensure efficient pixel throughput, which is evident in the scaling of performance across settings.

Interestingly, the GPU's nearest rivals in the benchmark database include the NVIDIA GeForce RTX 3080, which has an average score a mere 1.3% higher, and the AMD Radeon RX 5600M, which is 0.2% lower. This places the RX 6750 XT in a competitive position, though Roblox's specific rendering workload may favor one architecture over another. The GPU's DirectX 12 Ultimate support ensures compatibility with the latest rendering features, though the game's engine likely does not utilize them to their full extent. The data suggests that the GPU is rarely the limiting factor in this pairing, as evidenced by the high frame rates even at 4K.

Resolution Scaling

The measured FPS data reveals a clear pattern of performance scaling as resolution increases from 1080p to 4K. At the High preset, the average frame rate drops from 307.7 FPS at 1920x1080 to 208.8 FPS at 2560x1440, a reduction of 98.9 FPS or roughly 32.1%. Moving to 3840x2160, the High preset yields 116.2 FPS, which is a further drop of 92.6 FPS, or about 44.3% from the 1440p result. This scaling indicates that the GPU is becoming progressively more stressed as pixel count increases, while the CPU's workload remains relatively constant.

This scaling behavior suggests that at 1080p, the system may be partially limited by the CPU, as the i5-9400's six cores and six threads handle the game's logic, while the GPU has significant headroom. The frame rate difference between 1080p and 1440p is substantial, but the percentage drop is less than the 2.25x pixel count increase, indicating the GPU is not fully saturated at 1080p. Conversely, the drop from 1440p to 4K is proportionally larger, suggesting the GPU becomes the primary bottleneck at higher resolutions.

The data for the Low preset shows a similar trend: 387.2 FPS at 1080p, 256.4 FPS at 1440p, and 147.2 FPS at 4K. The ratio of 1080p to 4K performance is roughly 2.63x, which is close to the 4x pixel count difference, indicating that at Low settings, the GPU is more fully utilized. This analysis points to a balanced system where the CPU can keep up with the GPU at lower resolutions, but the GPU's workload scales predictably with resolution.

Measured FPS Breakdown

The complete set of measured average frame rates provides a clear picture of the system's capabilities. At 1920x1080, the data shows 387.2 FPS on Low, 349.7 FPS on Medium, 307.7 FPS on High, and 254.7 FPS on Ultra. The progression from Low to Ultra results in a 132.5 FPS reduction, or about 34.2% fewer frames, demonstrating the performance cost of increasing visual quality. The step between Medium and High is 42 FPS, while the step between High and Ultra is 53 FPS, showing an increasing performance penalty per setting tier.

At 2560x1440, the measured values are 256.4 FPS on Low, 232 FPS on Medium, 208.8 FPS on High, and 169 FPS on Ultra. The drop from Low to Ultra is 87.4 FPS, a 34.1% reduction, which is proportionally similar to the 1080p scaling. The difference between Medium and High is 23.2 FPS, and between High and Ultra is 39.8 FPS, indicating that the Ultra preset is particularly demanding at this resolution.

At 3840x2160, the frame rates are 147.2 FPS on Low, 133.5 FPS on Medium, 116.2 FPS on High, and 95.8 FPS on Ultra. The spread from Low to Ultra is 51.4 FPS, or about 34.9%, which is consistent with the other resolutions. The data shows that even at the most demanding configuration tested, the system maintains an average above 95 FPS, which is impressive for a Sandbox game. The consistent percentage drop across resolutions suggests that the rendering pipeline scales uniformly, with no unexpected bottlenecks emerging at any specific setting.

How This Combo Ranks

The combination of the Intel Core i5-9400 and AMD Radeon RX 6750 XT holds a rank of 891 out of 1800 tested combos in Roblox, placing it in the 49.5th percentile of all combinations. This mid-pack ranking is notable given the high absolute frame rates achieved, indicating that many other hardware pairings can deliver similar or better performance in this specific title. The ranking suggests that while this combo is more than capable of providing a smooth experience, it is not at the top tier of performance for Roblox.

The CPU's individual percentile of 50 places it exactly in the middle of all processors, while the GPU's percentile of 79 is significantly higher. This disparity suggests that the CPU may be the limiting factor in this pairing's overall ranking. The i5-9400's nearest rivals in the benchmark database include the Intel Core i3-10305 and Core i3-1125G4, both with average scores within 0.2% of the i5-9400, indicating that this processor is closely matched with more modern mid-range parts. The GPU's rivals, including the RTX 3080 and RX 5600M, show that the graphics card is competitive with higher-end options.

The data implies that upgrading the CPU to a more powerful model would likely improve the combo's rank in Roblox, as the GPU has demonstrated headroom at lower resolutions. However, the measured frame rates are already so high that the practical benefit would be minimal for most users. The rank of 891 out of 1800 suggests that roughly half of tested combos perform better, but the absolute performance is excellent, with even the lowest tested configuration exceeding 95 FPS average. This combination represents a balanced, high-performance pairing for Roblox, with the GPU providing the majority of the rendering power and the CPU adequately supporting it.