Roblox

The Intel Core i5-9400 paired with the NVIDIA GeForce RTX 4070 delivers exceptional performance in Roblox, with frame rates that far exceed display refresh rate capabilities across all tested resolutions and settings. The data indicates that this combination is severely GPU-bound at lower resolutions, while the scaling to 4K reveals a system that still maintains remarkably high playability, positioning it in the top quartile of all tested combinations.

Resolution Scaling

The measured FPS data shows a clear and consistent pattern of performance degradation as resolution increases from 1920x1080 to 3840x2160. At 1080p with High settings, the combo achieves 407 FPS, which drops to 268.6 FPS at 1440p, and further to 152.4 FPS at 4K. This represents a 62.6% reduction from 1080p to 4K, indicating that the rendering load scales almost linearly with pixel count, a typical characteristic for a GPU-bound scenario in a lightweight title like Roblox.

Analyzing the Low settings preset across resolutions provides the clearest view of the scaling behavior. At 1080p Low, the system produces 504.2 FPS, which decreases to 336 FPS at 1440p (a 33.4% drop) and then to 190.7 FPS at 4K (a 43.2% drop from 1440p). The diminishing returns at higher resolutions suggest that the RTX 4070's 12 GB of GDDR6X memory and 504.2 GB/s bandwidth are sufficient to feed the rendering pipeline, but the GPU's compute resources become the limiting factor as pixel count increases.

The Medium preset follows a similar trajectory: 456.2 FPS at 1080p, 303.5 FPS at 1440p, and 171.3 FPS at 4K. Interestingly, the gap between High and Medium settings narrows as resolution increases. At 1080p, the difference is 49.2 FPS (407 vs 456.2), but at 4K, the difference shrinks to 18.9 FPS (152.4 vs 171.3). This compression of performance gaps at higher resolutions indicates that the GPU's pixel throughput becomes the dominant constraint, rather than the specific shader complexity differences between presets.

The Ultra preset shows the most significant scaling penalty. From 329.5 FPS at 1080p to 221.7 FPS at 1440p (a 32.7% drop), and then to 125.9 FPS at 4K (a 43.2% drop from 1440p). The 4K Ultra result of 125.9 FPS is the lowest measured value in the entire dataset, yet it still represents a frame rate that is more than double the typical 60 Hz display refresh rate. This suggests that even at the most demanding settings, the i5-9400's six cores and six threads are not bottlenecking the RTX 4070's capabilities.

FAQ

Q: What is the highest frame rate achievable with this combination?

A: The peak measured performance is 504.2 FPS, achieved at 1920x1080 resolution with Low settings. This indicates the RTX 4070 is capable of extremely high output in Roblox when the CPU is not constrained by higher resolution rendering.

Q: How does the i5-9400 compare to its nearest rivals in CPU benchmarks?

A: The i5-9400 has an average benchmark score of 2305, placing it nearly identical to the Intel Core i3-10305 (2300, +0.2% delta) and the Intel Core i3-1125G4 (2299, +0.2% delta). It is 0.4% ahead of the Intel Xeon E-2134 (2295) and 0.6% behind the Intel Core i7-8809G (2319).

Q: Is the RTX 4070's performance consistent with its GPU benchmark standing?

A: The RTX 4070 has an average benchmark score of 37283, which places it in the 81st percentile of all GPUs. Its nearest rival, the AMD Radeon RX Vega 56, scores 37507 (0.6% higher), indicating the two cards have nearly identical average performance in synthetic benchmarks, though the RTX 4070's real-world Roblox results are substantially high.

Q: What is the performance gap between Low and Ultra settings at 4K?

A: At 3840x2160, the Low preset produces 190.7 FPS, while Ultra produces 125.9 FPS. This represents a 64.8 FPS difference, or a 33.9% reduction in frame rate when moving from Low to Ultra, showing that the visual quality settings have a moderate impact at this resolution.

Q: How does the combo rank among all tested configurations?

A: This specific combo ranks 433rd out of 1800 tested combinations in Roblox, placing it in the top 24.1% of all configurations. This ranking reflects the strong performance of both the CPU and GPU working together.

Q: Does the CPU hold back the GPU at any resolution?

A: The data suggests the i5-9400 does not bottleneck the RTX 4070 in Roblox. At 1080p Low, the system reaches 504.2 FPS, which is far beyond what most displays can show, and the performance scales predictably with resolution, indicating the GPU is the primary driver of frame rates.

Settings Recommendations

For players prioritizing maximum visual fidelity without sacrificing smoothness, the Ultra preset at 1440p presents the best balance. The measured 221.7 FPS at 2560x1440 Ultra is well above the threshold for high-refresh-rate gaming, and it delivers the highest visual quality available in the test set while maintaining frame rates that are unlikely to show any perceptible stutter. At 4K, the Ultra preset drops to 125.9 FPS, which is still playable but represents a more significant compromise between visuals and performance.

If the target is a locked 240 Hz experience, the High settings at 1440p (268.6 FPS) and even the High settings at 4K (152.4 FPS) offer substantial headroom. The Medium preset at 1440p provides 303.5 FPS, which is sufficient for the most demanding 240 Hz displays, while the Low preset at 1080p (504.2 FPS) is the only configuration that approaches the theoretical maximum output of the system.

For 4K gaming specifically, the Medium preset (171.3 FPS) is the recommended choice. It provides a 12.4% improvement over High settings (152.4 FPS) while delivering noticeably better visual quality than Low settings (190.7 FPS). The 45.4 FPS gap between Medium and Ultra at 4K (171.3 vs 125.9) suggests that the additional visual features in Ultra come at a significant performance cost, making Medium the optimal compromise for 4K displays.

Measured FPS Breakdown

At 1920x1080, the system demonstrates its peak performance ceiling. The Low preset achieves 504.2 FPS, the highest value in the entire dataset. Medium settings produce 456.2 FPS, representing an 9.5% reduction from Low. High settings deliver 407 FPS, and Ultra drops to 329.5 FPS. The spread from Low to Ultra is 174.7 FPS, showing that settings have a substantial impact on frame rates at this resolution.

Moving to 2560x1440, the performance scales down consistently. Low settings produce 336 FPS, Medium delivers 303.5 FPS, High achieves 268.6 FPS, and Ultra reaches 221.7 FPS. The gap between Low and Ultra narrows to 114.3 FPS at this resolution, compared to 174.7 FPS at 1080p, indicating that the GPU's pixel processing becomes more demanding as resolution increases.

At 3840x2160, the system still delivers excellent playability across all presets. Low settings produce 190.7 FPS, Medium achieves 171.3 FPS, High delivers 152.4 FPS, and Ultra bottoms out at 125.9 FPS. The performance delta between Low and Ultra at 4K is 64.8 FPS, which is the smallest absolute spread across all resolutions, confirming that the GPU is becoming the limiting component at this resolution.

How This Combo Ranks

The combination of the Intel Core i5-9400 and NVIDIA GeForce RTX 4070 achieves a rank of 433 out of 1800 tested combos in Roblox, placing it in the top 24.1% of all configurations. This rank is particularly strong given that the i5-9400 is an older Coffee Lake processor with only 6 cores and 6 threads, while the RTX 4070 is a modern Ada Lovelace GPU with 5888 shading units.

The CPU's benchmark position helps contextualize this ranking. With an average score of 2305 and a 50th percentile standing among all CPUs, the i5-9400 is an average performer in synthetic tests. However, in Roblox, the game's relatively simple physics and logic systems do not heavily tax the CPU, allowing the RTX 4070 to operate near its full potential. The GPU's 81st percentile ranking among all GPUs, with an average score of 37283, is the primary driver of the combo's strong overall position.

The ranking also reflects the efficiency of the pairing. The RTX 4070's nearest rivals in GPU benchmarks — the AMD Radeon RX Vega 56 (37507, -0.6% delta) and the NVIDIA GeForce MX570 A (38008, -1.9% delta) — have similar synthetic scores, but the RTX 4070's modern architecture and 12 GB of GDDR6X memory provide advantages in real-world gaming scenarios. The fact that this combo ranks 433rd out of 1800, despite using a mid-range CPU from 2018, suggests that GPU performance is the dominant factor in Roblox, and users with faster processors would see only marginal improvements in this specific title.