Roblox

Roblox is not a typical GPU stress test, and the numbers for the Intel Core i5-12400F + NVIDIA GeForce RTX 4080 SUPER combo prove it. The data shows a platform that is heavily CPU-limited at lower resolutions, with the GPU only beginning to flex its muscles at 4K. The average frame rates are exceptionally high across the board, but the scaling pattern reveals where the real bottleneck lies.

Resolution Scaling

The most telling statistic is the drop from 1080p to 4K. At 1080p with Low settings, the combo produces 640.6 FPS. Moving to 1440p drops that to 427.8 FPS, and at 4K it falls to 242.1 FPS. That is a 62% reduction from 1080p to 4K on Low settings. For High settings, the descent is from 513.4 FPS at 1080p to 344.8 FPS at 1440p, and finally to 196.2 FPS at 4K — a 62% total drop as well. This steep decline indicates that while the RTX 4080 SUPER is capable, the i5-12400F is holding things back at lower resolutions.

At 1080p, the gap between Low and Ultra is 223 FPS (640.6 vs 417.6). At 4K, that same gap shrinks to 83.3 FPS (242.1 vs 158.8). This compression of the settings gap at higher resolutions is a classic sign of the CPU becoming less of a factor. When the pixel count rises, the GPU workload increases, and the 4080 SUPER starts to show its true potential. The data suggests that at 1080p, you are essentially measuring the i5-12400F's single-thread speed, not the GPU's raw power.

The 4K Ultra result of 158.8 FPS is still remarkably high for a sandbox game, but it is the only point where the RTX 4080 SUPER's 52.22 TFLOPS of FP32 performance seems relevant. The scaling from 1440p to 4K on Ultra — a drop from 276.7 to 158.8 FPS — is a 43% reduction, which is a much more typical GPU-bound curve. In short, the limiting component shifts from the CPU at 1080p/1440p to the GPU only at 4K with maximum settings.

FAQ

Q: Can this system run Roblox at 4K with high settings?

A: Yes. The measured data shows an average of 196.2 FPS at 3840x2160 with High settings. This is well above the refresh rate of most monitors, indicating a smooth experience.

Q: Is the RTX 4080 SUPER wasted on this game?

A: Not entirely, but it is underutilized. At 1080p Low, the system hits 640.6 FPS, which is a CPU-bound result. The GPU only becomes a significant factor at 4K, where the difference between Low and Ultra settings is more pronounced.

Q: What is the best resolution for maximum frame rates?

A: 1080p Low yields the highest average at 640.6 FPS. However, even at 1440p High, the system maintains 344.8 FPS, which is still exceptionally fast for competitive play.

Q: How does the i5-12400F perform in synthetic benchmarks compared to its rivals?

A: The i5-12400F has an average benchmark score of 19221, which is 0.1% higher than the Intel Core i7-8700K and 0.3% higher than the Intel Core i5-1335U. It is 0.7% slower than the AMD Ryzen 5 7533HS. This places it in the 77th percentile of all CPUs.

Q: Does the GPU have enough VRAM for this game?

A: Yes, the RTX 4080 SUPER has 16 GB of GDDR6X memory. Roblox is not a VRAM-intensive title, so the memory capacity is far beyond what is required at any of the measured settings.

Q: What is the performance ranking of this specific PC combo in Roblox?

A: This combination ranks 122nd out of 1800 tested combos in Roblox. This places it in the top 7% of all systems tested for this game.

Settings Recommendations

For players with high-refresh-rate 1080p or 1440p monitors, the choice is about balancing visual fidelity against raw frame rates. The data shows that at 1440p, Medium settings produce 391.1 FPS, while High settings produce 344.8 FPS. The 46 FPS difference is not massive, but the visual upgrade might be worth it. For strictly competitive play, Low settings at 1080p (640.6 FPS) or 1440p (427.8 FPS) are the optimal choices to minimize input latency.

At 4K, the situation changes. High settings (196.2 FPS) are a better choice than Ultra (158.8 FPS) because the visual difference between High and Ultra is often negligible in Roblox, but the 37.4 FPS performance gain is significant. Medium settings at 4K (221.6 FPS) offer a good middle ground for those who want a higher frame rate without sacrificing too much visual quality. The sweet spot for a 4K 144Hz display is Medium or High, as both exceed the 144 FPS threshold.

Given the CPU-bound nature at lower resolutions, there is little reason to drop to Low settings at 1440p if you have a 144Hz monitor, as even Ultra settings (276.7 FPS) exceed that refresh rate. For a 240Hz monitor at 1440p, you would want to stick to Medium (391.1 FPS) or High (344.8 FPS). The data indicates that the i5-12400F can feed the RTX 4080 SUPER well enough to hit high frame rates, but the GPU will never be the limiting factor until you reach 4K.

Measured FPS Breakdown

The measured data provides a complete matrix of performance across three resolutions and four settings levels. At 1920x1080, the average FPS ranges from a peak of 640.6 on Low to a minimum of 417.6 on Ultra. The progression is linear: Low (640.6), Medium (579.3), High (513.4), and Ultra (417.6). This represents a 35% penalty for maxing out settings at 1080p.

Moving to 2560x1440, the results are 427.8 FPS on Low, 391.1 FPS on Medium, 344.8 FPS on High, and 276.7 FPS on Ultra. The drop from Low to Ultra at this resolution is 151.1 FPS, or 35%. This is a similar percentage drop to 1080p, suggesting the CPU is still a major factor. The absolute numbers are lower, but the scaling pattern is consistent.

At 3840x2160, the frame rates are 242.1 FPS on Low, 221.6 FPS on Medium, 196.2 FPS on High, and 158.8 FPS on Ultra. The penalty for Ultra over Low is 83.3 FPS, or 34%. Interestingly, the percentage penalty remains roughly constant across all resolutions, but the absolute delta shrinks as the total FPS decreases. This indicates that the settings menu has a consistent impact on GPU load, but the CPU becomes the primary limiter as resolution drops.

The data shows that even the lowest measured result (158.8 FPS at 4K Ultra) is higher than what most users would consider a playable frame rate. This system never dips below 150 FPS in any tested configuration, which reflects the combination's capability in Roblox.

GPU Role

The NVIDIA GeForce RTX 4080 SUPER is a high-end card with 16 GB of GDDR6X memory and a 256-bit bus, providing 736.3 GB/s of bandwidth. Its boost clock is 2550 MHz, and it has 10240 shading units. In Roblox, this hardware is largely overkill. The card's passmark G3D score of 34245 places it in the 88th percentile of all GPUs, and its average benchmark score is 53610, which is 0.2% higher than the AMD Radeon RX 6900 XT.

However, the measured FPS data shows that the GPU is not the bottleneck until 4K. At 1080p, the difference between Low and Ultra settings is 223 FPS, which is a GPU workload difference, but the absolute FPS numbers are so high that the CPU is clearly the limiting factor. The card's 52.22 TFLOPS of FP32 performance is not being fully utilized at lower resolutions.

At 4K, the GPU's role becomes more apparent. The jump from High (196.2 FPS) to Ultra (158.8 FPS) represents a 19% performance hit, which is a more typical GPU-bound scaling. The card's 16 GB of VRAM is more than sufficient for Roblox, and its 112 ROPs and 320 TMUs handle the game's simple geometry with ease. The data suggests that this GPU is future-proof for Roblox even as the game evolves, but for now, its power is only partially tapped.

CPU Role

The Intel Core i5-12400F is a 6-core, 12-thread processor from the Alder Lake architecture, with a base clock of 2.50 GHz and a boost clock of 4.40 GHz. It has 18 MB of L3 cache and supports both DDR4 and DDR5 memory. Its passmark single-thread score is 3481, and its multithread score is 19433. In the 3dmark single-thread test, it scores 909, which is a strong indicator of its gaming capability.

This CPU is the primary driver of Roblox's performance at 1080p and 1440p. The fact that the system hits 640.6 FPS at 1080p Low, but only 242.1 FPS at 4K Low, shows that the CPU can push a massive number of frames, but the GPU cannot keep up when the pixel count increases. The i5-12400F's percentile rank of 77th among all CPUs, with an average benchmark score of 19221, puts it in the same league as the Intel Core i7-8700K (deltaPct 0.1) and the AMD Ryzen 5 7533HS (deltaPct -0.7).

The CPU's 6 cores and 12 threads are more than enough for Roblox's single-threaded nature. The boost clock of 4.40 GHz is critical for achieving the high FPS numbers seen in the data. The benchmark results show that the CPU's single-thread performance (3dmark single-thread score of 909) is what matters most here, as Roblox does not scale well with additional cores. The i5-12400F's performance is essentially the ceiling for this game at lower resolutions, and the RTX 4080 SUPER is simply waiting for the CPU to feed it more data.