Roblox

Roblox is a notoriously CPU-bound sandbox title, and the measured results for the Intel Core i5-14400F paired with the NVIDIA GeForce RTX 4090 confirm this dynamic with striking clarity. The data shows a system where the GPU is rarely the limiting factor, even at the highest resolutions, resulting in frame rates that far exceed display refresh rates across the board.

Resolution Scaling

The frame rate scaling from 1080p to 4K reveals a classic CPU-limited scenario. At 1920x1080 with Low settings, the combo produces an average of 714.2 FPS. Moving to 2560x1440 Low, the average drops to 478.7 FPS, a significant 32.9% reduction. Scaling further to 3840x2160 Low yields 269.1 FPS, another 43.8% drop from the 1440p figure. This steep decline as resolution increases indicates that while the CPU is the primary bottleneck at lower resolutions, the GPU begins to take on more work as pixel count rises.

The pattern holds across all settings presets. The Ultra preset shows the most dramatic scaling: 464.2 FPS at 1080p, 308.4 FPS at 1440p, and 172.6 FPS at 4K. The High preset follows a similar trajectory, with 570.2 FPS at 1080p, 384.6 FPS at 1440p, and 216.8 FPS at 4K. The consistent shape of these curves—a roughly 30-45% drop per resolution step—suggests that neither component is entirely idle at any point, but the CPU's performance ceiling is what caps the absolute maximum frame rate, particularly at 1080p where the RTX 4090 could theoretically render far more frames.

At 4K, the gap between Low and Medium settings narrows to 24.6 FPS (269.1 vs 244.5), whereas at 1080p the same settings gap is 65.1 FPS (714.2 vs 649.1). This compression at higher resolutions is the signature of the GPU becoming a more active participant in the bottleneck, though even at 4K Ultra the combo still delivers 172.6 FPS, which is well above the refresh rate of most high-end monitors.

How This Combo Ranks

Among the 1,800 tested CPU and GPU combinations for Roblox, this pairing sits at rank 53. That places it in the top 2.9% of all systems, a strong showing that reflects the i5-14400F's excellent single-threaded performance, which is critical for Roblox's physics and scripting workloads. The CPU's Cinebench R23 single-core score of 3,093 and Geekbench single-core score of 2,333 are the drivers here, as Roblox does not scale well across many threads.

The nearest rivals in the CPU benchmark database provide context for the processor's overall capability. The Intel Core i7-12800H scores essentially identically (0% delta), while the AMD Ryzen 5 PRO 7645 trails by just 0.2%. The Intel Core i7-13705H and AMD Ryzen 7 250 are within 0.2% in either direction. This tight clustering means the i5-14400F is operating at the very top of its performance class, and for Roblox specifically, the rank 53 result shows that this pairing outperforms the vast majority of systems, including many with higher-end CPUs that may have more cores but weaker single-thread performance.

The GPU's own benchmark standing reinforces this. The RTX 4090 sits at the 91st percentile among all GPUs, with an average benchmark score of 66,473. Its nearest rivals are all professional workstation cards—the NVIDIA Tesla T4 (-0.4%), Tesla P40 (+0.5%), AMD Radeon Pro Vega 56 (-0.9%), and Quadro P6000 (-1.3%)—which are not designed for gaming workloads. This means the RTX 4090 is effectively unmatched in consumer gaming scenarios, making the CPU the clear performance limiter in Roblox.

GPU Role

The NVIDIA GeForce RTX 4090 brings overwhelming specifications to this pairing. Its 24 GB of GDDR6X memory on a 384-bit bus delivers 1.01 TB/s of bandwidth, which is far beyond what Roblox requires. The GPU's 16,384 shading units and 176 ROPs are equally overkill for a game that is not graphically demanding by modern standards. The base clock of 2,235 MHz boosts to 2,520 MHz, and the memory runs at 21 Gbps effective.

In the measured data, the GPU's role is best understood by looking at the delta between Low and Ultra settings at each resolution. At 1080p, the gap is 250 FPS (714.2 vs 464.2). At 1440p, it narrows to 170.3 FPS (478.7 vs 308.4). At 4K, it shrinks further to 96.5 FPS (269.1 vs 172.6). The GPU's ability to absorb these quality increases without collapsing frame rates shows that even at 4K Ultra, the RTX 4090 is operating well within its capacity—the 172.6 FPS result would be impressive for most systems at 1080p, let alone 4K.

The GPU's 3DMark Steel Nomad DX12 score of 9,223 and Passmark G3D score of 38,194 are among the highest recorded, but in Roblox these benchmarks matter less than the CPU's ability to feed the renderer. The RTX 4090 is effectively waiting for the i5-14400F to supply draw calls, which is why the frame rate differences between settings are relatively modest in absolute terms.

Settings Recommendations

The measured rows suggest that the High preset offers the best balance of visual quality and performance. At 4K High, the system delivers 216.8 FPS, which is a 25.7% improvement over Ultra's 172.6 FPS while still maintaining a very high visual fidelity. The gap between High and Medium at 4K is 27.7 FPS (216.8 vs 244.5), meaning High captures most of the visual benefit of Ultra with a meaningful performance headroom.

For users with high-refresh-rate displays, the 1440p High setting at 384.6 FPS is the sweet spot. This resolution and settings combination provides frame rates that will saturate virtually any consumer monitor, including 240 Hz and 360 Hz panels. The 1080p High result of 570.2 FPS is excessive for all but the most extreme esports displays, and the visual uplift from 1080p to 1440p is generally more impactful than the difference between High and Ultra settings.

The Low preset delivers the highest raw frame rates—714.2 FPS at 1080p and 269.1 FPS at 4K—but these numbers come at a significant visual cost. Given that even Ultra at 4K produces 172.6 FPS, there is no practical reason to use Low settings in Roblox with this hardware, as the CPU and GPU combination has ample headroom to run higher presets at frame rates that remain far above typical display refresh rates.

Measured FPS Breakdown

At 1920x1080, the system produces its highest frame rates. The Low preset averages 714.2 FPS, Medium reaches 649.1 FPS, High hits 570.2 FPS, and Ultra drops to 464.2 FPS. The progression from Low to Ultra represents a 35% reduction in frame rate, but even the lowest result is more than double what most gaming monitors can display.

At 2560x1440, the averages are 478.7 FPS (Low), 431.3 FPS (Medium), 384.6 FPS (High), and 308.4 FPS (Ultra). The percentage drop from 1080p to 1440p is consistent across settings: Low falls by 33%, Medium by 33.5%, High by 32.5%, and Ultra by 33.5%. This uniformity indicates that the scaling penalty is largely resolution-driven rather than settings-driven, reinforcing the CPU-bound analysis.

At 3840x2160, the averages are 269.1 FPS (Low), 244.5 FPS (Medium), 216.8 FPS (High), and 172.6 FPS (Ultra). The drop from 1440p to 4K is steeper: Low falls by 43.8%, Medium by 43.3%, High by 43.6%, and Ultra by 44%. The larger percentage decrease at 4K compared to 1440p shows the GPU starting to assert its influence, though the absolute numbers remain exceptionally high. The difference between Low and Ultra at 4K is 96.5 FPS, compared to 250 FPS at 1080p, demonstrating that settings have less impact on frame rate as resolution increases.

FAQ

Q: Is the RTX 4090 wasted in this Roblox configuration?

A: The data shows the GPU is underutilized at lower resolutions. At 1080p Low, the system produces 714.2 FPS, which is far beyond what any display can show, indicating the CPU is the limiting factor. However, at 4K Ultra, the combo still delivers 172.6 FPS, showing the RTX 4090 does contribute at higher resolutions, even if it is never fully saturated.

Q: How does this combo rank against other tested systems?

A: It ranks 53rd out of 1,800 tested combinations, placing it in the top 2.9% of all systems tested for Roblox. This is driven by the CPU's strong single-core performance, which Roblox relies on heavily.

Q: What is the best resolution for this setup?

A: The 2560x1440 High preset at 384.6 FPS provides the best combination of visual quality and frame rate headroom. This resolution and settings level will saturate virtually any consumer monitor while maintaining high image quality.

Q: How much performance is lost going from Low to Ultra settings?

A: At 1080p, the difference between Low (714.2 FPS) and Ultra (464.2 FPS) is 250 FPS, a 35% reduction. At 4K, the gap narrows to 96.5 FPS (269.1 vs 172.6), a 35.8% reduction. The relative penalty is consistent across resolutions.

Q: Is the CPU or GPU the bottleneck in Roblox?

A: The CPU is clearly the primary bottleneck. The frame rate drops of 33% from 1080p to 1440p and 44% from 1440p to 4K are much smaller than would be expected if the GPU were the limiting factor, given the RTX 4090's massive compute resources.

Q: What is the highest frame rate this combo can achieve?

A: The highest measured average is 714.2 FPS at 1080p with Low settings. The lowest measured average is 172.6 FPS at 4K with Ultra settings. No other settings or resolutions were tested in the data.