Roblox

Roblox, a sandbox title released in 2006, presents an unusual performance profile that depends heavily on the balance between CPU and GPU capabilities. The data for the Intel Core i5-12400 paired with the NVIDIA GeForce RTX 4090 shows a system that is overwhelmingly GPU-bound at lower resolutions but becomes more balanced as the resolution increases. The measured frame rates across 1080p, 1440p, and 4K reveal how this combination leverages the strengths of each component to deliver exceptionally high performance, ranking in the top percentile of all tested combos.

Resolution Scaling

The frame rate data shows a clear and predictable decline as resolution increases, but the magnitude of that decline reveals the system's primary bottleneck. At 1920x1080 with Ultra settings, the combo achieves 464.9 FPS. Increasing the resolution to 2560x1440 at the same settings drops the average to 310.6 FPS, a reduction of 33.2%. Moving to 3840x2160 at Ultra further reduces the average to 176 FPS, which is 62.1% lower than the 1080p result.

This scaling pattern indicates that the RTX 4090 is not being fully utilized at 1080p. The frame rate at 1080p Ultra is so high that the CPU, despite its strong single-thread performance, becomes the limiting factor. The gap between 1080p and 1440p is significant, but the gap between 1440p and 4K is even more pronounced. The 4K Ultra score of 176 FPS is still exceptionally high, but the drop from 310.6 FPS at 1440p shows the GPU's rendering workload is finally becoming the dominant constraint. The data suggests that for users targeting 4K, the RTX 4090 is working as intended, while at 1080p, the i5-12400's processing limits cap the potential output, even with a GPU that has a 91st percentile ranking among all GPUs.

CPU Role

The Intel Core i5-12400 is a 6-core, 12-thread processor based on the Alder Lake architecture, with a base clock of 2.50 GHz and a boost clock of 4.40 GHz. Its performance in synthetic benchmarks shows a strong balance between single-threaded and multi-threaded tasks. In Cinebench R23, it scores 2249 in single-core and 15935 in multi-core. The 3DMark single-thread score is 910, while the max-thread score is 5890. These figures indicate a processor capable of handling the physics and game logic of Roblox, which often relies on a few fast cores.

In the context of this game, the CPU's role is clearly demonstrated by the performance at 1080p with Low settings, where the average FPS reaches 711.2. This high number suggests that the game's engine is not heavily multi-threaded, and the i5-12400's single-thread performance is sufficient to push frame rates beyond what most displays can show. However, the CPU's limitation becomes apparent when comparing settings at the same resolution. At 1080p, the difference between Low (711.2 FPS) and Ultra (464.9 FPS) is substantial, but this is more attributable to GPU load than CPU load, as the CPU's workload remains relatively constant. The i5-12400's percentile ranking of 77th among all CPUs, with an average benchmark score of 19850, places it in a competitive position, nearly matching the Intel Core i7-9700 (19831, deltaPct 0.1). This suggests that for Roblox, the CPU is a capable partner, but it does not have the headroom to consistently feed the RTX 4090 at lower resolutions.

GPU Role

The NVIDIA GeForce RTX 4090 is a massive GPU with 24 GB of GDDR6X memory on a 384-bit bus, providing a bandwidth of 1.01 TB/s. Its core clocks are 2235 MHz base and 2520 MHz boost, and it features 16384 shading units. The GPU's compute capabilities are substantial, with an FP32 performance of 82.58 TFLOPS. This hardware is designed for extreme workloads, and its role in Roblox is to provide massive headroom for high resolutions and settings.

The data shows that the GPU's influence grows with resolution. At 4K, the GPU is clearly the primary driver of performance, as the frame rates vary significantly with settings. At 3840x2160, the average FPS ranges from 176 on Ultra to 269.3 on Low. This 53% difference between the lowest and highest settings at 4K demonstrates that the GPU is handling the majority of the rendering work. The RTX 4090's performance in synthetic tests, such as a Passmark G3D score of 38194 and a 3DMark Steel Nomad DX12 score of 9223, underscores its capability. However, the data also reveals that in this specific game, the GPU is often underutilized. At 1080p High, the average FPS is 572.2, which is high, but the GPU could likely push even higher if the CPU could keep up. The GPU's percentile ranking of 91st among all GPUs, with an average benchmark score of 66473, places it near the NVIDIA Tesla T4 (66733, deltaPct -0.4) and AMD Radeon Pro Vega 56 (67097, deltaPct -0.9), but its real-world performance in Roblox is dictated by the game's engine limits.

Measured FPS Breakdown

The measured FPS data provides a comprehensive view of the system's performance across all settings and resolutions. At 1920x1080, the system achieves its highest frame rates. The Low preset yields an average of 711.2 FPS, Medium produces 646 FPS, High drops to 572.2 FPS, and Ultra settles at 464.9 FPS. This progression shows a clear 34.6% performance penalty from Low to Ultra at 1080p.

At 2560x1440, the frame rates remain high but show a more pronounced drop. Low settings produce 479.1 FPS, Medium achieves 430.6 FPS, High reaches 381.2 FPS, and Ultra drops to 310.6 FPS. The gap between Low and Ultra at 1440p is 35.2%, slightly larger than at 1080p, indicating the GPU is starting to take on more work.

At 3840x2160, the system still delivers excellent playable frame rates. Low settings average 269.3 FPS, Medium reaches 247.4 FPS, High hits 216.9 FPS, and Ultra drops to 176 FPS. The difference between Low and Ultra at 4K is 34.7%, consistent with the other resolutions. Across all resolutions, the Low preset always delivers the highest FPS, and Ultra always delivers the lowest, but the relative performance penalty for enabling higher settings remains remarkably consistent, suggesting a well-optimized scaling system within the game engine.

How This Combo Ranks

The combination of the Intel Core i5-12400 and NVIDIA GeForce RTX 4090 holds a combo rank of 50 out of 1800 tested combinations in Roblox. This places the system in the top 2.8% of all tested hardware pairings for this game. The ranking reflects the substantial performance headroom of this setup, as it is capable of delivering frame rates well above the refresh rates of most monitors.

The high ranking is somewhat surprising given that the CPU is not a top-tier part. The i5-12400's average benchmark score of 19850 is nearly identical to its nearest rival, the Intel Core i7-9700, with a deltaPct of 0.1, and it slightly outperforms the Intel Core i7-8700, which has a deltaPct of -0.2. The GPU, however, is a flagship part, and its performance dominates the combo's overall ranking. The data suggests that in Roblox, the GPU's raw power is the primary driver of the combo's high rank, as the game does not appear to require an excessive amount of CPU resources to achieve high frame rates. The 50th rank out of 1800 combos indicates that this system is one of the most capable configurations for Roblox, and the data confirms that it can handle even the most demanding settings at 4K with over 170 FPS.

FAQ

Q: What is the highest average FPS this combo achieves in Roblox?

A: The highest average FPS is 711.2, achieved at 1920x1080 resolution with Low settings.

Q: How does the system perform at 4K Ultra settings?

A: At 3840x2160 with Ultra settings, the system delivers an average FPS of 176, which is still very high for 4K gaming.

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

A: At 1080p, the data suggests the CPU is the limiting factor, as the frame rates are extremely high but do not scale as much with GPU settings changes compared to lower resolutions.

Q: What is the combo's rank among all tested hardware combinations in Roblox?

A: This combo ranks 50th out of 1800 tested combinations, placing it in the top percentile of all tested systems.

Q: How does the i5-12400 compare to its nearest rival, the Intel Core i7-9700?

A: The i5-12400 has an average benchmark score of 19850, which is 0.1% higher than the Intel Core i7-9700's score of 19831.

Q: What is the performance difference between Low and Ultra settings at 2560x1440?

A: At 2560x1440, Low settings produce an average of 479.1 FPS, while Ultra settings produce 310.6 FPS, representing a 35.2% reduction in performance.