Roblox

Roblox on the Intel Core i5-9400 and AMD Radeon RX 570 combo presents a compelling study in bottleneck dynamics for a massively popular sandbox title. The measured data reveals a system that is remarkably capable at mainstream resolutions, yet the performance curve as resolution climbs suggests a specific and predictable hardware limitation. The combination ranks 1747 out of 1800 tested combos in this game, placing it in the lower percentile of all systems measured, which makes its strong absolute frame rates at 1080p a notable data point for users on older hardware.

Resolution Scaling

The FPS progression across resolutions tells a clear story about where the system's limits lie. At 1920x1080 with High settings, the combo produces 116.5 FPS, which is a robust experience for a game like Roblox that often features user-generated worlds with variable optimization. Moving to 2560x1440 drops the average to 80.2 FPS, a 31% reduction in performance from the 1080p figure. Scaling further to 3840x2160 yields 43.1 FPS, which is another 46% drop from the 1440p result. This scaling pattern—where the largest percentage loss occurs between 1440p and 4K—strongly indicates that the AMD Radeon RX 570 is the primary limiting component as pixel count increases.

The data suggests that at 1080p, the CPU and GPU are relatively balanced, allowing the system to push high frame rates. However, the load on the GPU increases exponentially with resolution, and the RX 570's 4 GB of GDDR5 memory and 224.0 GB/s bandwidth begin to struggle to feed the frame buffer at 4K. The jump from 116.5 FPS at 1080p to 43.1 FPS at 4K on High settings is a 63% total performance loss, which is a steep curve but not unexpected for a GPU with a 256-bit memory interface. The fact that even at 4K the frame rate remains playable at above 30 FPS shows that the Polaris 20 chip still has headroom, but the data implies that for a consistently smooth 60 FPS experience, this resolution is out of reach for this pairing.

How This Combo Ranks

The combo's rank of 1747 out of 1800 systems in Roblox places it in the bottom 3% of all tested configurations. This is a curious statistic when juxtaposed with the measured FPS. At 1080p Low, the system achieves 150.7 FPS, which is objectively a very playable and high-frame-rate result. This indicates that while this specific CPU and GPU pairing is not a top-tier performer in the database's aggregate scoring, Roblox's specific engine characteristics allow it to perform admirably in absolute terms. The ranking likely reflects that many other combos include more modern CPUs and GPUs with higher benchmark scores, even if the actual FPS difference in this specific game is not massive.

Looking at the GPU's percentile rank of 74 versus all other GPUs, it shows that the RX 570 sits in the upper quartile of all graphics cards tested. Its nearest rivals include the NVIDIA GeForce RTX 5060 and the AMD Radeon RX 7700 XT, with average benchmark scores that are within 0.8% of the RX 570's score of 30158. This is unusual, as those are much newer and more powerful cards on paper, but the aggregate benchmark score suggests that in the specific workloads measured, the RX 570 holds its own. This context explains the combo's FPS output; the GPU is a solid performer, but the CPU's 50th percentile ranking among all CPUs (with a 2305 average benchmark score) may be holding the system back from higher frame rates, especially in CPU-bound scenarios at lower resolutions.

Settings Recommendations

For users prioritizing a smooth experience at 1920x1080, the data supports using High settings as a sweet spot. The 116.5 FPS average at this setting is significantly above the 98.2 FPS seen at Ultra, but the visual jump from High to Ultra often comes with a high performance cost. The measured difference of 18.3 FPS between High and Ultra at 1080p represents an 18.6% performance hit for what is typically a marginal visual improvement in Roblox's blocky aesthetic. For competitive play, Low settings at 1080p offer the maximum frame rate of 150.7 FPS, which can be beneficial for reducing input latency, though it sacrifices visual fidelity.

At 2560x1440, the data suggests that Medium settings are the most balanced option. The 87.5 FPS average at Medium is comfortably above the 60 FPS threshold, providing a smooth experience. Dropping to Low at 1440p yields 99.5 FPS, but the difference between Medium and Low is less impactful than the jump to High, which falls to 80.2 FPS. For users with 1440p monitors, the data shows that High is still playable, but Medium provides a safer buffer against frame drops in busy scenes. At 4K, the situation is more constrained; Low settings at 53.9 FPS is the only row that approaches a playable standard, and even then, it falls below 60 FPS, indicating that 4K gaming on this combo requires significant compromises.

Measured FPS Breakdown

The complete dataset provides a full picture of the combo's capabilities. At 1920x1080, the frame rates are as follows: Low settings produce 150.7 FPS, Medium produces 134.6 FPS, High produces 116.5 FPS, and Ultra produces 98.2 FPS. The scaling from Low to Ultra at 1080p shows a 52.5 FPS difference, which is a 34.8% drop from the lowest settings. This is a typical range for a GPU of this class, showing that the RX 570 has enough compute power to handle Roblox's rendering at high speeds even with increased visual effects.

At 2560x1440, the measured averages are 99.5 FPS on Low, 87.5 FPS on Medium, 80.2 FPS on High, and 63.3 FPS on Ultra. The drop from Low to Ultra here is 36.2 FPS, a 36.4% reduction, which is proportionally similar to the 1080p scaling but with lower absolute numbers. At 3840x2160, the performance tiers compress: Low yields 53.9 FPS, Medium yields 49.6 FPS, High yields 43.1 FPS, and Ultra yields 38 FPS. The spread from Low to Ultra at 4K is only 15.9 FPS, indicating that at this resolution, the GPU is so heavily loaded that the settings differences have a smaller relative impact on the final frame rate.

GPU Role

The AMD Radeon RX 570 is the clear workhorse for rendering Roblox, and its specifications directly correlate with the measured performance. The GPU's 4 GB of GDDR5 memory is a critical factor; at 4K resolution, the larger frame buffer requirements likely cause the system to rely more heavily on memory bandwidth, which is rated at 224.0 GB/s. The memory clock of 1750 MHz (7 Gbps effective) is a standard figure for this generation, and the data suggests it is sufficient for 1080p but becomes a bottleneck at higher resolutions.

The GPU has a base clock of 1168 MHz and a boost clock of 1244 MHz, with a pixel rate of 39.81 GPixel/s and a texture rate of 159.2 GTexel/s. These figures explain why the GPU can handle the simple geometry of Roblox efficiently; the 2048 shading units and 128 TMUs provide ample parallel processing power. The GPU's FP32 performance of 5.095 TFLOPS is respectable for a card of its age, and its 74th percentile ranking among all GPUs confirms that it is still a relevant performer. The fact that its nearest rivals include cards like the RTX 5060 and RX 7700 XT, with average scores within 0.8%, reflects the Polaris architecture's longevity in the benchmark database.

CPU Role

The Intel Core i5-9400 provides the foundation for this combo, and its 6 cores and 6 threads are a crucial element. With a base clock of 2.90 GHz and a boost clock of 4.10 GHz, the CPU has a decent speed for gaming, but its lack of hyper-threading means it may struggle with heavily multi-threaded tasks. In Roblox, which often relies on a single primary game thread, the i5-9400's single-core performance is key. The Cinebench R23 single-core score of 1125 and multi-core score of 7969 show that the CPU is capable, but its 50th percentile ranking among all CPUs suggests it is average.

The CPU's 9 MB of shared L3 cache is a moderate amount, and its dual-channel DDR4 memory support with 42.7 GB/s bandwidth is standard. The data implies that at 1080p Low settings, where the GPU is not heavily taxed, the CPU's single-threaded performance is the limiting factor for reaching the 150.7 FPS figure. If the CPU were stronger, the FPS at low settings might be even higher. The CPU's nearest rival, the Intel Core i3-10305, has an average benchmark score within 0.2% of the i5-9400, confirming that the i5-9400 is a solid mid-range performer, but not a high-end one. This is reflected in the combo's overall ranking of 1747, as the CPU's average performance relative to other processors drags the combined score down.

FAQ

Q: What is the best resolution for this combo to achieve 60 FPS?

A: The measured data shows that at 2560x1440 with Ultra settings, the combo achieves 63.3 FPS, which is just above the 60 FPS threshold. For a more comfortable margin, 1440p on High settings yields 80.2 FPS, and 1080p on Ultra yields 98.2 FPS.

Q: How much performance is lost when moving from 1080p to 4K?

A: On High settings, the average frame rate drops from 116.5 FPS at 1920x1080 to 43.1 FPS at 3840x2160. This represents a 73.4 FPS difference, or a 63% reduction in average FPS.

Q: Is this system better suited for CPU-bound or GPU-bound games?

A: The data indicates this combo is more balanced at 1080p, but the GPU becomes the clear limiting factor at higher resolutions. The CPU's 50th percentile ranking and the GPU's 74th percentile ranking suggest the system may be slightly more GPU-dependent in Roblox.

Q: What are the FPS differences between Low and Ultra settings at 1080p?

A: At 1920x1080, Low settings produce 150.7 FPS, while Ultra settings produce 98.2 FPS. The difference is 52.5 FPS, meaning Ultra is about 34.8% slower than Low.

Q: Does the GPU's 4 GB of VRAM impact 4K performance?

A: The data shows that at 3840x2160, even Low settings only achieve 53.9 FPS. The 4 GB VRAM and 224.0 GB/s bandwidth are likely contributing factors to the significant performance drop at this resolution.

Q: How does this combo rank against all other tested systems in Roblox?

A: The combo rank is 1747 out of 1800 tested combos. This places it in the bottom 3% of all systems in the database, even though it achieves playable frame rates at 1080p and 1440p.