Roblox

Roblox is a game where frame pacing and raw throughput matter more than visual fidelity, and the Intel Core i5-12400 with AMD Radeon RX 580 combination shows a clear pattern of diminishing returns as you push settings higher. The sweet spot for this pairing is the Medium preset, which consistently delivers a significant jump in smoothness over High without the steep performance penalty that Ultra incurs. At 1080p, Medium yields 147.2 FPS, which is 12.0 FPS higher than High (135.2 FPS) and only 17.9 FPS below the Low preset's 165.1 FPS. The gap between Medium and Ultra is far more punishing, with Ultra dropping to 107.7 FPS at 1080p—a 39.5 FPS loss from Medium. At 1440p, the pattern holds: Medium hits 102.9 FPS, comfortably above the 85.4 FPS of High and the 70.6 FPS of Ultra, while Low reaches 108.1 FPS. Even at 4K, Medium remains playable at 55.6 FPS, whereas Ultra falls to 42.6 FPS, which is below the threshold for a consistently smooth experience. The data suggests that Medium offers the best balance of visual quality and frame rate headroom across all resolutions, making it the recommended starting point for this build.

GPU Role

The AMD Radeon RX 580 is the primary limiting factor in this combination, and its memory configuration and clock speeds tell the story. The GPU operates with a base clock of 1257 MHz and a boost clock of 1340 MHz, which are modest figures by modern standards, and it relies on 8 GB of GDDR5 memory running at 2000 MHz (8 Gbps effective) across a 256-bit bus. This yields a memory bandwidth of 256.0 GB/s, which is sufficient for Roblox's blocky textures but becomes strained as resolution and settings increase. The GPU's compute capabilities are reflected in its 2304 shading units and 6.175 TFLOPS of FP32 performance, but the benchmark results show that raw compute is not the bottleneck—memory bandwidth and fill rate are. The pixel rate of 42.88 GPixel/s and texture rate of 193.0 GTexel/s are adequate for 1080p, but the 4K results indicate that the RX 580's 32 ROPs are overwhelmed when pushing 3840x2160 pixels. The GPU's percentile ranking of 53 against all GPUs places it in the mid-range, and its nearest rivals—the NVIDIA GeForce GTX 570 and GTX 950—are within a 0.1% deltaPct, confirming that this is an older-generation card that holds its own in lighter titles. The 4K Low preset (62.4 FPS) versus 4K High (48.6 FPS) shows a 13.8 FPS swing, which is a direct result of the GPU's memory system being taxed more heavily by higher-quality textures and effects.

Resolution Scaling

The FPS drop from 1080p to 4K is dramatic and reveals where the bottleneck shifts. At 1080p Medium, the combo produces 147.2 FPS; at 1440p Medium, it drops to 102.9 FPS—a 44.3 FPS reduction. Moving to 4K Medium, the frame rate falls to 55.6 FPS, which is another 47.3 FPS loss. This scaling pattern indicates that the RX 580 is the limiting component, as the CPU has enough headroom to handle the increased pixel count without a proportional drop. The 1080p Low preset (165.1 FPS) and 1440p Low (108.1 FPS) show a 57.0 FPS gap, while 4K Low (62.4 FPS) is only 45.7 FPS lower than 1440p Low. The fact that Low settings at 4K (62.4 FPS) are faster than High settings at 4K (48.6 FPS) by 13.8 FPS underscores that the GPU's memory bandwidth is the hard ceiling. At 1080p, the CPU can push frame rates high enough that the GPU becomes the sole bottleneck, but at 4K, the GPU's 256.0 GB/s bandwidth is saturated, and the FPS numbers flatten out. The 1080p Ultra (107.7 FPS) versus 4K Ultra (42.6 FPS) shows a 65.1 FPS drop, which is more than double the drop from 1080p Medium to 4K Medium (91.6 FPS difference). This suggests that the combination of high settings and high resolution taxes the GPU's 32 ROPs and 144 TMUs beyond their efficient operating range.

Measured FPS Breakdown

At 3840x2160, the measured results show a clear hierarchy. Low settings deliver 62.4 FPS, which is the only playable option at this resolution, while Medium drops to 55.6 FPS—a 6.8 FPS loss that might be acceptable for less demanding scenes. High settings fall to 48.6 FPS, and Ultra bottoms out at 42.6 FPS. The spread from Low to Ultra at 4K is 19.8 FPS, which is the smallest absolute range across all resolutions, indicating that the GPU is uniformly bottlenecked regardless of settings. At 2560x1440, the results improve substantially. Low hits 108.1 FPS, Medium reaches 102.9 FPS, and High maintains 85.4 FPS, while Ultra drops to 70.6 FPS. The 1440p Medium result is particularly notable because it exceeds the 1080p High result of 135.2 FPS by a wide margin, showing that the resolution is not the primary constraint at this level. At 1920x1080, the combo performs best. Low reaches 165.1 FPS, Medium achieves 147.2 FPS, High produces 135.2 FPS, and Ultra still manages 107.7 FPS. The 1080p results show a 57.4 FPS spread from Low to Ultra, which is the largest spread, meaning the CPU and GPU have enough headroom to differentiate settings meaningfully. Across all resolutions, the Low-to-Ultra penalty is consistent: 19.8 FPS at 4K, 37.5 FPS at 1440p, and 57.4 FPS at 1080p. This progression shows that as resolution decreases, the cost of higher settings becomes more pronounced, which is the opposite of what a CPU-bound scenario would produce.

How This Combo Ranks

The Intel Core i5-12400 + AMD Radeon RX 580 combination ranks 1681 out of 1800 tested combos in Roblox, placing it in the bottom 7% of all systems. This ranking is directly attributable to the GPU's age and the CPU's mid-range position. The CPU itself is not the issue—it ranks in the 77th percentile of all CPUs and sits within 0.4% of the Intel Core i5-11600K and within 0.1% of the Intel Core i7-9700 in average benchmark scores. The GPU, however, ranks in the 53rd percentile of all GPUs and is effectively tied with the NVIDIA GeForce GTX 570 (0.0% deltaPct) and GTX 950 (0.1% deltaPct). The combination of a strong modern CPU with an older mid-range GPU creates a system that is heavily GPU-limited in Roblox, which is why the ranking is so low. The measured FPS data confirms this: even at 1080p Low, the system only reaches 165.1 FPS, which is far below what a high-end CPU could push if paired with a more capable GPU. The combo's rank of 1681 out of 1800 suggests that while it can run Roblox, it does so at frame rates that are significantly lower than most other tested configurations. For context, the CPU's nearest rivals (i7-9700, i7-8700) would likely perform similarly with the same GPU, as the bottleneck is clearly on the graphics side.

CPU Role

The Intel Core i5-12400 provides a solid foundation for this system, with 6 cores and 12 threads running at a base clock of 2.50 GHz and a boost clock of 4.40 GHz. This Alder Lake-S chip has an 18 MB shared L3 cache and supports DDR4 and DDR5 memory, though the data shows that the CPU is rarely the limiting factor in Roblox. The single-thread performance is strong, with a Cinebench R23 single-core score of 2249 and a 3DMark single-thread score of 910, which is crucial for Roblox's physics and scripting workloads that are often single-thread bound. However, the multi-threaded results—such as the Cinebench R23 multi-core score of 15935 and the PassMark multi-thread score of 18747—indicate that the CPU has ample headroom for the game's parallel tasks. The CPU's 65W TDP and 10 nm process node keep it efficient, and its 77th percentile ranking against all CPUs places it well above the GPU's 53rd percentile. In practice, this means the CPU can easily feed the RX 580 at 1080p, but at higher resolutions, the GPU cannot keep up, and the CPU's extra capacity goes unused. The 1080p Low preset (165.1 FPS) versus 1440p Low (108.1 FPS) shows a 57.0 FPS drop that is purely GPU-driven, as the CPU would have no trouble maintaining 165 FPS at 1440p if the GPU were faster. The 4K results reinforce this: the CPU's boost clock of 4.40 GHz is sufficient to handle the game logic, but the GPU's 256.0 GB/s bandwidth and 32 ROPs cap the frame rate. The data indicates that a stronger GPU would unlock the CPU's full potential—the i5-12400's PassMark single-thread score of 3456 and 3DMark 4-thread score of 3012 suggest it could drive 200+ FPS in Roblox if paired with a more powerful graphics card.