Roblox

The Intel Core i5-12400F paired with the AMD Radeon RX 6800 XT is a high-refresh-rate monster in Roblox, delivering playable frame rates even at 4K Ultra. The data shows this combo is heavily GPU-limited at 4K, but at 1080p and 1440p, the CPU becomes the primary bottleneck, capping performance well below what the GPU can theoretically produce.

Resolution Scaling

The frame rate drop from 1080p to 4K is drastic and reveals a clear shift in the limiting component. At 1920x1080 with Ultra settings, the combo averages 306.8 FPS. Moving to 2560x1440 Ultra drops that to 205.3 FPS, a reduction of roughly 33%. At 3840x2160 Ultra, the average falls to 117.1 FPS, which is about 62% lower than the 1080p result. This steep decline indicates that at 1080p, the system is not fully utilizing the RX 6800 XT's capabilities; the i5-12400F's single-thread performance is the ceiling. As resolution increases, the GPU workload grows, and the frame rate begins to reflect the graphics card's true rendering power.

Comparing Low settings across resolutions tells the same story. At 1080p Low, the combo hits 464.9 FPS. At 1440p Low, it drops to 313.4 FPS, and at 4K Low, it falls to 179 FPS. The relative drop from 1080p to 4K at Low settings is about 61.5%, which is nearly identical to the drop seen at Ultra. This consistency suggests that even at Low settings, the GPU is still the dominant factor at 4K, while the CPU's limitation is most pronounced at 1080p where the frame rate is extremely high.

The scaling pattern indicates that 1440p is the sweet spot for this pairing. At 1440p Ultra, the 205.3 FPS average is still far above the refresh rate of most high-end monitors, and the system is balancing CPU and GPU loads more evenly. Pushing to 4K Ultra yields a still-playable 117.1 FPS, but the 62% performance hit from 1080p shows that the RX 6800 XT is doing the heavy lifting at that resolution, making the CPU's role less critical.

Settings Recommendations

For competitive play or maximum frame rates, the Low preset at 1080p delivers an exceptional 464.9 FPS average. This is ideal for players using 360Hz monitors or those who prioritize the highest possible responsiveness. The jump from Low to Medium at 1080p costs about 41.8 FPS (from 464.9 to 423.1), while the jump from Medium to High costs another 51.7 FPS (down to 371.4). The drop from High to Ultra is more severe, costing 64.6 FPS (down to 306.8), which is a 17.4% reduction.

At 1440p, the Medium preset provides a strong balance, delivering 281.2 FPS. This is only 32.2 FPS lower than Low (313.4 FPS) but offers significantly better visual fidelity. High at 1440p drops to 249.7 FPS, which is still excellent for high-refresh displays. Ultra at 1440p is the most demanding option, yielding 205.3 FPS, which remains smooth but represents a 26.9% drop from Medium.

For 4K gaming, the data suggests using Medium settings to prioritize frame rate. Medium at 4K averages 157.6 FPS, which is a 40.5 FPS improvement over Ultra (117.1 FPS) and a 21.4 FPS improvement over High (142.6 FPS). The Low preset at 4K offers the highest average at 179 FPS, but the visual compromise is substantial. Given that Medium provides over 144 FPS at 4K, it is the recommended preset for a smooth high-resolution experience without sacrificing too much visual quality.

CPU Role

The Intel Core i5-12400F features 6 cores and 12 threads, with a base clock of 2.50 GHz and a boost clock of 4.40 GHz. Its benchmark scores show strong single-thread performance, with a 3dmark_single_thread score of 909 and a passmark_single_thread score of 3481. In Cinebench R23, it scores 2332 in single-core and 16518 in multi-core. These numbers indicate that the CPU is well-suited for Roblox, a game that relies heavily on single-thread performance for its simulation and physics logic.

The data confirms that the CPU is the limiting factor at 1080p. At 1080p Low, the combo reaches 464.9 FPS, but the GPU is capable of much more in this lightweight title. The CPU's performance ceiling appears to be around 465 FPS in this scenario. This is evident because the frame rate does not scale linearly with GPU load at lower resolutions. The CPU's passmark_multithread score of 19433 and 3dmark_max_threads score of 5912 show it has enough multi-threaded headroom, but Roblox's engine likely doesn't utilize all 12 threads effectively.

The CPU's percentile ranking of 77 indicates it performs better than most CPUs on the market. Its nearest rival, the Intel Core i7-8700K, scores nearly identically with an average of 19210, a deltaPct of just 0.1%. This means the i5-12400F is effectively on par with that older flagship. The AMD EPYC 7773X, a server chip, scores 18979, which is 1.3% lower, showing that high-core-count workstation chips do not necessarily translate to better gaming performance in this title.

How This Combo Ranks

In the database of tested combos for Roblox, this specific pairing of the Intel Core i5-12400F and AMD Radeon RX 6800 XT ranks at position 633 out of 1800 total combinations. This places it in the top 35% of all tested systems, which is a strong result given the game's low system requirements. The rank indicates that while this combo is powerful, there are many other configurations that achieve higher frame rates, likely with newer CPUs that have even stronger single-thread performance.

The GPU's benchmark scores are notably high. The RX 6800 XT has a passmark_g3d score of 24980 and a passmark_gpu_compute score of 13245. Its percentileVsAllGpus is 87, meaning it outperforms 87% of all GPUs. In 3DMark Steel Nomad DX12, it scores 3689. Its nearest rival, the NVIDIA GeForce RTX 4070 Ti SUPER, has an average score of 48704, which is 2.6% lower than the RX 6800 XT's average of 49982. This suggests the AMD card holds its own against current-generation NVIDIA offerings in raw compute.

The combo's rank of 633 is somewhat lower than what the individual component percentiles might suggest. This discrepancy is likely due to the CPU bottleneck observed at lower resolutions. While the GPU is in the top 13% (87th percentile), the CPU is in the top 23% (77th percentile), and the combination of the two may not be optimal for a game that is so heavily CPU-dependent. A newer CPU with higher single-thread scores would likely push this combo higher in the rankings.

FAQ

Q: What is the highest average frame rate achievable with this combo in Roblox?

A: The highest recorded average is 464.9 FPS at 1920x1080 with Low settings.

Q: How does this combo perform at 4K Ultra settings?

A: At 3840x2160 with Ultra settings, the combo averages 117.1 FPS, which is playable but represents a significant drop from lower resolutions.

Q: Is the CPU or GPU the main bottleneck at 1080p?

A: The data indicates the CPU is the limiting factor at 1080p, as the frame rate at Low settings (464.9 FPS) is likely near the CPU's maximum output, while the GPU has more headroom.

Q: What is the frame rate difference between Low and Ultra at 1440p?

A: At 2560x1440, Low settings average 313.4 FPS, while Ultra settings average 205.3 FPS, a difference of 108.1 FPS.

Q: How does the i5-12400F compare to its closest rival, the i7-8700K?

A: The i5-12400F has an average benchmark score of 19221, which is only 0.1% higher than the i7-8700K's score of 19210, making them effectively equal in performance.

Q: What is the best preset for 4K gaming with this hardware?

A: For 4K, the Medium preset offers the best balance, delivering 157.6 FPS, which is significantly higher than Ultra's 117.1 FPS while maintaining decent visual quality.

Measured FPS Breakdown

At 1920x1080, the combo delivers its highest frame rates. Low settings average 464.9 FPS, Medium averages 423.1 FPS, High averages 371.4 FPS, and Ultra averages 306.8 FPS. The scaling from Low to Ultra shows a total drop of 158.1 FPS.

At 2560x1440, performance remains very high. Low settings average 313.4 FPS, Medium averages 281.2 FPS, High averages 249.7 FPS, and Ultra averages 205.3 FPS. The drop from Low to Ultra at this resolution is 108.1 FPS.

At 3840x2160, the GPU is stressed more heavily. Low settings average 179 FPS, Medium averages 157.6 FPS, High averages 142.6 FPS, and Ultra averages 117.1 FPS. The difference between Low and Ultra at 4K is 61.9 FPS, the smallest absolute gap across all resolutions, confirming the GPU's increasing dominance as the pixel count rises.