Roblox

Roblox is a game where frame rates can reach extraordinary heights, and the combination of the Intel Core i5-9400 and AMD Radeon RX 9070 demonstrates this clearly. The measured data reveals a system that is overwhelmingly GPU-bound at lower resolutions, but which still manages to deliver playable—and often exceptionally high—frame rates even at 4K. This analysis breaks down the performance characteristics of this specific pairing, examining how resolution, settings, and component capabilities interact to produce the final results.

Resolution Scaling

The frame rate progression from 1080p to 4K tells a clear story about where the bottleneck lies in this system. At 1920x1080 with Low settings, the combo achieves 474 FPS. Moving to 2560x1440 drops that to 316 FPS, a reduction of 33.3%, and then at 3840x2160 it falls to 179 FPS, which is 43.4% lower than the 1440p result. This pattern of significant percentage drops with each resolution increase is a classic indicator that the system is heavily CPU-limited at lower resolutions, with the graphics card having ample headroom to spare.

The scaling behavior changes notably at higher settings presets. For Ultra settings, the progression from 309 FPS at 1080p to 206 FPS at 1440p (a 33.3% drop) and then to 117 FPS at 4K (a 43.2% drop from 1440p) follows a very similar proportional pattern. However, the absolute FPS values are much lower, suggesting that the graphics card begins to play a more significant role as the rendering load increases. The fact that the percentage drops are nearly identical across Low and Ultra settings suggests that the CPU is the primary limiter even at 4K for this particular game, which is known for being less demanding on the GPU than many modern titles.

The data implies that if a user were to pair this CPU with a less powerful GPU, the frame rates at 1080p might not change dramatically, as the CPU is already the limiting factor. Conversely, upgrading the CPU would likely yield substantial gains at 1080p and 1440p, but the GPU would eventually become the constraint at 4K. The near-linear scaling of FPS with resolution is a strong signal that the i5-9400's six threads are being fully utilized and are preventing the RX 9070 from reaching its full potential at lower resolutions.

GPU Role

The AMD Radeon RX 9070 is a formidable piece of hardware, featuring 16 GB of GDDR6 memory on a 256-bit bus, which provides a memory bandwidth of 644.6 GB/s. Its boost clock is listed at 2520 MHz, and it has a game clock of 2070 MHz. The GPU's raw compute capability is substantial, with 3584 shading units and 224 texture mapping units, enabling a texture fill rate of 564.5 GTexel/s. These specifications are more than sufficient to handle Roblox's visual demands, even at the highest settings and resolutions.

However, the measured FPS data shows that the GPU is far from being the bottleneck in this configuration. At 4K Ultra, the combo still manages 117 FPS, which is a demanding scenario for most hardware. The fact that the i5-9400 can push the RX 9070 to produce over 300 FPS at 1080p Ultra highlights the GPU's efficiency. The VRAM allocation is another factor; 16 GB is far more than Roblox would ever need, even with high-resolution texture packs. This suggests that the GPU's role here is not to struggle for frame rates but rather to ensure that the CPU is the only thing holding back performance, which is a common situation in less graphically intensive games.

The GPU's 69th percentile ranking among all GPUs indicates it is a high-performing part, but its interaction with the i5-9400 in this game creates an interesting dynamic. The benchmark results, such as a Passmark G3D score of 25381, confirm its capability, yet the in-game data shows it being underutilized at lower resolutions. This points to a system where the GPU is waiting for instructions from the CPU, a classic imbalance that is more pronounced in games with high frame rate ceilings like Roblox.

How This Combo Ranks

In the grand scheme of the benchmark database, this specific combination of the Intel Core i5-9400 and AMD Radeon RX 9070 ranks 1122 out of 3711 tested combos for Roblox. This places it in the 69.8th percentile of all tested systems, which is a strong showing. The ranking indicates that while this isn't the absolute top-tier configuration for the game, it is significantly better than the majority of systems that have been tested.

The CPU itself has a percentile rank of 47 against all CPUs, and its average benchmark score of 2254 puts it in close competition with the Intel Core i7-1068NG7, which scores 2259 (a 0.2% difference), and the Intel Core i3-10305 at 2264 (a -0.4% difference). This shows the i5-9400 is a solid mid-range processor. The GPU, on the other hand, is in the 69th percentile, with an average score of 23877, making it slightly less powerful than the AMD Radeon RX 6800S (which has a 0.8% higher score) but more powerful than the NVIDIA GeForce RTX 3080 Mobile (which is 1.1% lower).

The discrepancy between the CPU's mid-range percentile and the GPU's higher percentile explains the combo's overall ranking. The system's performance in Roblox is likely constrained by the CPU, preventing it from climbing higher in the rankings. The data suggests that a more powerful CPU would push this combo much higher, potentially into the top 20%, as the GPU has proven it can handle the frame rates the CPU is currently providing.

Measured FPS Breakdown

1920x1080: At this resolution, the system produces its highest frame rates. With Low settings, the average FPS is 474. Medium settings yield 431 FPS, with a minimum of 367 and a maximum of 496 FPS. High settings produce 381 FPS, and Ultra settings drop to 309 FPS. The difference between Low and Ultra is 165 FPS, a 34.8% reduction, showing that the settings have a significant impact even at 1080p.

2560x1440: At 1440p, the frame rates remain exceptionally high. Low settings average 316 FPS. Medium settings average 288 FPS, with a min/max of 245 and 331 FPS. High settings produce 254 FPS, and Ultra settings yield 206 FPS. The drop from Low to Ultra is 110 FPS, a 34.8% reduction, which is proportionally identical to the 1080p drop, reinforcing the CPU-bound nature of the system.

3840x2160: At 4K, the system still delivers very playable frame rates. Low settings average 179 FPS. Medium settings average 163 FPS, with a minimum of 138 and a maximum of 187 FPS. High settings produce 144 FPS, and Ultra settings average 117 FPS. The difference between Low and Ultra is 62 FPS, a 34.6% reduction, again showing the consistent scaling pattern.

The data shows a consistent pattern: the percentage difference between Low and Ultra settings is nearly identical (around 35%) at every resolution. This uniformity strongly suggests that the performance scaling is driven by the CPU's fixed processing capability, with the GPU having more than enough power to handle the increased load from higher settings without becoming a limiting factor.

FAQ

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

A: The highest recorded average FPS is 474, which occurs at 1920x1080 resolution with Low settings.

Q: How does the frame rate drop when moving from 1080p to 1440p at High settings?

A: At 1080p High, the average FPS is 381, and at 1440p High, it is 254. This represents a 33.3% decrease in performance.

Q: Is the system more limited by the CPU or the GPU in Roblox?

A: The data indicates a strong CPU limitation. The consistent ~35% performance decrease from Low to Ultra settings across all resolutions suggests the CPU is the primary bottleneck, as the GPU is capable of higher frame rates than the CPU can provide.

Q: What is the minimum FPS recorded for this combo?

A: The lowest minimum FPS recorded is 138, which occurs at 3840x2160 resolution with Medium settings. This is still a very playable frame rate.

Q: How does this combo rank against all other tested combinations for Roblox?

A: This combo ranks 1122 out of 3711 tested combinations, placing it in the top 30.2% of all tested systems.

Q: What is the average FPS at 4K Ultra settings?

A: The average FPS at 3840x2160 with Ultra settings is 117, which is a smooth experience for most displays.

Settings Recommendations

For the best balance of visual fidelity and performance, the High settings preset at 2560x1440 resolution appears to be an excellent choice. It delivers an average of 254 FPS, which is far beyond the refresh rate of most high-end monitors. This provides a significant visual upgrade over Low and Medium settings while maintaining a frame rate that is more than sufficient for competitive or casual play. The jump from Medium to High at 1440p costs 34 FPS (from 288 to 254), which is a reasonable trade-off for better visuals.

If a user has a 4K display, the Medium preset is the recommended starting point. At 3840x2160, Medium settings deliver an average of 163 FPS with a minimum of 138 FPS, ensuring a consistently smooth experience with no noticeable dips. While Ultra at 4K is playable at 117 FPS, the Medium preset provides a substantial 46 FPS advantage over Ultra, and the visual difference between Medium and Ultra in Roblox is often not as pronounced as in more graphically intense titles. For those seeking the absolute highest frame rates, playing at 1080p with Low settings yields 474 FPS, which is beneficial for competitive play on high-refresh-rate monitors.

The data suggests that the system has enough headroom to comfortably run High settings at 1080p, producing 381 FPS, which is still an exceptionally high number. Ultimately, the best setting depends on the user's display and preference, but the measurements clearly show that High at 1440p or Medium at 4K offer the most balanced experience without sacrificing smoothness.

CPU Role

The Intel Core i5-9400 is a 6-core, 6-thread processor from the Coffee Lake architecture, with a base clock of 2.90 GHz and a boost clock of 4.10 GHz. It has a 9 MB shared L3 cache and supports dual-channel DDR4 memory with a bandwidth of 42.7 GB/s. Its benchmark scores, such as 6629 in Cinebench R23 multi-core, place it in the 47th percentile of all CPUs, indicating it is a capable mid-range part.

In the context of Roblox, the CPU's role is critical. The nearly identical performance scaling across different resolutions points directly at the CPU's processing limits as the primary constraint. The game's engine appears to be heavily dependent on single-core performance, and while the i5-9400's boost clock of 4.10 GHz is respectable, its 6 threads are likely being saturated at the high frame rates being produced. The fact that the frame rates scale almost linearly with resolution suggests that the CPU is doing the same amount of work regardless of the pixel count, which is a characteristic of a game that is not heavily GPU-bound.

This means that the i5-9400 is holding back the RX 9070 significantly. The GPU is capable of much higher frame rates, as evidenced by its 69th percentile ranking and its performance in other scenarios. The data implies that upgrading to a CPU with higher single-thread performance or more cores would unlock substantially more FPS in Roblox, potentially pushing the system from the 69.8th percentile to the top tier. The CPU's 47th percentile ranking among all CPUs, contrasted with the GPU's 69th percentile, clearly shows the performance gap and where the bottleneck in this system lies.