Roblox

Roblox is a sandbox title that leans heavily on single-threaded CPU performance for its core simulation logic, while the GPU handles rendering of the blocky worlds and post-processing effects. The Intel Core i5-9400 presents a six-core, six-thread configuration from the Coffee Lake architecture, with a base clock of 2.90 GHz and a boost clock of 4.10 GHz. Its 9 MB of shared L3 cache helps keep frequently accessed game data close to the cores, which is beneficial in a game like Roblox where physics and script execution can create sudden CPU load spikes. The CPU’s benchmark scores place it at the 50th percentile among all CPUs, indicating it is a mid-pack performer; in Cinebench R23, it scores 7969 multi-core and 1125 single-core. Its nearest rival in average benchmark score is the Intel Core i7-8809G, which scores 2319, a delta of -0.6%, meaning the i5-9400 is slightly behind that part. Conversely, it holds a 0.2% advantage over the Intel Core i3-10305 and Intel Core i3-1125G4, both scoring 2300 and 2299 respectively, showing the i5-9400 sits in a tightly contested performance band.

The AMD Radeon RX 7600 XT is the GPU component, representing the RDNA 3.0 architecture with a Navi 33 chip. It features a substantial 16 GB of GDDR6 memory on a 128-bit bus, yielding a bandwidth of 288.0 GB/s. The memory clock is listed as 2250 MHz with an effective 18 Gbps data rate. The GPU’s boost clock reaches 2755 MHz, while the game clock is 2470 MHz. This combination of large VRAM capacity and high bandwidth is well-suited for Roblox’s often unoptimized texture streaming, which can bloat memory usage at higher settings. The GPU scores at the 63rd percentile of all GPUs, with an average benchmark score of 20146. Its closest rivals include the AMD Radeon RX 7600, which scores 20258 and is 0.6% ahead, and the NVIDIA GeForce RTX 3070 Mobile at 20534, which is 1.9% ahead. The RX 7600 XT is notably ahead of the NVIDIA GeForce RTX 2060 SUPER, which scores 19774, giving the AMD card a 1.9% advantage in aggregate benchmarks.

CPU Role — cores, clocks, and how they relate to this game's results

The Intel Core i5-9400’s six physical cores without hyper-threading mean the operating system sees six threads, which is adequate for Roblox’s typical load profile. Roblox is not a highly parallel game; it often relies on a primary simulation thread that cannot be easily split across many cores. The CPU’s single-core performance, evidenced by a Cinebench R20 single-core score of 472, is what drives the game’s logic. The boost clock of 4.10 GHz is the key figure here, as it determines how fast the CPU can execute those sequential instructions. The data shows that at 1080p with Low settings, the combo achieves 318.9 FPS, but as settings rise, the frame rate drops to 255.9 FPS on High and 208.9 FPS on Ultra. This scaling pattern suggests that even at lower settings, the CPU is not fully bottlenecked, but the increasing load from rendering adds pressure to the CPU’s draw-call processing.

Comparing to its nearest rivals, the i5-9400 is effectively tied with the i3-10305, which has a higher boost clock but fewer cores. The delta of 0.2% in average benchmark score between them is negligible. The i7-8809G, while having a slightly higher average score, is a mobile-derived part with a different thermal profile. In Roblox, the i5-9400’s 2.90 GHz base clock is rarely the limiting factor because the CPU can boost to 4.10 GHz when needed. The benchmark results indicate that the CPU’s memory bandwidth of 42.7 GB/s over dual-channel DDR4 is sufficient for the game’s data streaming, as the measured FPS does not collapse at high resolutions where more data is moved per frame. The CPU’s position at the 50th percentile means half of all tested CPUs are faster, but for a game like Roblox, the absolute ceiling is often lower than other titles, allowing this mid-range chip to keep up.

GPU Role — VRAM, clocks, and how they relate to this game's results

The AMD Radeon RX 7600 XT is the dominant component in this pairing for raw rendering throughput. Its 16 GB VRAM buffer is a notable asset, as Roblox worlds can contain a vast number of unique assets without proper level-of-detail management, leading to high memory consumption. The 128-bit memory bus and 288.0 GB/s bandwidth provide enough data throughput to feed the 2048 shading units without starving them. The GPU’s boost clock of 2755 MHz is high, and the game clock of 2470 MHz represents the sustained frequency under load, which is what the measured FPS reflects. The GPU’s pixel rate of 176.3 GPixel/s and texture rate of 352.6 GTexel/s indicate it can handle the fill-rate demands of Roblox’s simple geometry, but the game’s lighting and post-processing effects at Ultra settings still tax the GPU.

The benchmark data shows a clear GPU influence at higher resolutions. At 4K Ultra, the combo drops to 76.8 FPS, while at 4K Low it reaches 119.2 FPS. This 42.4 FPS difference is primarily a GPU workload change, as the CPU’s role in processing game logic remains constant regardless of resolution. The GPU’s 63rd percentile ranking among all GPUs suggests it is above average, and its nearest rival, the RX 7600, is only 0.6% faster on average, confirming they are closely matched. The RTX 2060 SUPER, which is 1.9% slower, would likely produce lower frame rates in Roblox at the same settings. The RX 7600 XT’s support for DirectX 12 Ultimate, as indicated in the API list, is a plus, though Roblox primarily uses older rendering paths unless the user enables specific graphics features.

Resolution Scaling — how FPS drops from 1080p to 4K and what it says about the limiting component

Analyzing the measured FPS across resolutions reveals the bottleneck structure of this combo. At 1080p with Low settings, the system produces 318.9 FPS. Moving to 1440p Low drops this to 211.4 FPS, a reduction of 107.5 FPS or roughly 34%. The drop from 1440p Low to 4K Low is even steeper, going from 211.4 FPS to 119.2 FPS, a 92.2 FPS decline. These significant drops at lower settings indicate that the GPU is the primary limiter, because the CPU’s workload does not scale with resolution. If the CPU were the bottleneck, we would expect to see similar FPS figures across resolutions at the same settings, but the data clearly shows a strong negative correlation between resolution and frame rate.

At Ultra settings, the scaling is more compressed. The FPS goes from 208.9 at 1080p, to 140.9 at 1440p, to 76.8 at 4K. The percentage drop from 1080p to 4K at Ultra is 63%, which is larger than the 63% drop seen at Low settings. This suggests that at Ultra, the GPU is under heavier load due to increased shading and post-processing, making it even more of a limiting factor. The gap between Low and Ultra at 4K is 42.4 FPS, while at 1080p that same gap is 110 FPS. This compression of the settings spread at higher resolutions is a classic sign of a GPU bottleneck, where the GPU is saturated and cannot deliver the higher frame rates that lower settings would otherwise allow. The data indicates that for this combo, the GPU is the limiting component across all tested configurations, with the CPU providing a sufficiently high frame rate ceiling that is not hit in these benchmarks.

How This Combo Ranks — use comboRankInGame vs other tested combos

The combination of the Intel Core i5-9400 and AMD Radeon RX 7600 XT ranks 1177 out of 1800 tested combos in Roblox. This places it in the lower third of the performance distribution, which is surprising given the individual component rankings. The CPU is at the 50th percentile and the GPU is at the 63rd percentile, yet the combo ranks at the 65th percentile from the bottom. This suggests that Roblox’s performance is sensitive to other factors, such as memory latency or specific CPU instructions, where this pairing does not excel. The rank of 1177 indicates that there are 623 combos that perform worse, but also 1176 combos that perform better. The deltaPct values for the GPU’s rivals show that the RX 7600 XT is very close to the RX 7600, so a combo with that GPU would likely rank similarly.

The ranking implies that while this system is capable of high frame rates in absolute terms, many other tested systems deliver even higher performance. This is likely due to the CPU’s modest single-thread performance relative to newer parts. The i5-9400’s Cinebench R23 single-core score of 1125 is not low, but it is outclassed by many modern CPUs that boost higher and have better IPC. The combo’s rank of 1177 out of 1800 means it is in the 65th percentile of all combos, which is above the median but not by a large margin. For a user with a 144Hz monitor, this system would be sufficient at 1080p, but at 4K Ultra, the 76.8 FPS average might not be smooth enough for a high-refresh display.

Measured FPS Breakdown — resolution by resolution, settings by settings, exact numbers

The measured FPS data provides a detailed view of performance across twelve configurations. Starting with 1920x1080, the lowest resolution tested, the system achieves its highest frame rates. With Low settings, the average FPS is 318.9. Medium settings reduce this to 292.9 FPS, a drop of 26 FPS. High settings yield 255.9 FPS, and Ultra settings produce 208.9 FPS. The scaling from Low to Ultra at 1080p is a 110 FPS reduction, indicating that the GPU has headroom at lower settings but is progressively more taxed as visual quality increases.

At 2560x1440, the frame rates are lower but still high. Low settings deliver 211.4 FPS, which is a 33.7% reduction from the 1080p Low figure. Medium settings average 195 FPS, High settings average 169.8 FPS, and Ultra settings drop to 140.9 FPS. The gap between Low and Ultra at 1440p is 70.5 FPS, smaller than the 110 FPS gap at 1080p. This trend continues at 3840x2160, where Low settings produce 119.2 FPS, Medium produces 109.6 FPS, High produces 99.7 FPS, and Ultra produces 76.8 FPS. The Low-to-Ultra gap at 4K is 42.4 FPS, showing that the GPU is nearing its limits and the differences between settings are compressed. The data shows that at 1080p, the system is capable of exceeding 300 FPS on Low, which is well above most display refresh rates, while at 4K Ultra, it dips below 80 FPS, which is borderline for smooth gameplay on a standard 60Hz monitor.

FAQ

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

A: The highest average FPS is 318.9, achieved at 1920x1080 resolution with Low settings.

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

A: At 3840x2160 with Ultra settings, the average FPS is 76.8, which is the lowest score recorded in the measured data.

Q: Is the CPU or GPU more likely to be the bottleneck in this system?

A: The data indicates the GPU is the primary limiting factor, as frame rates drop significantly with increasing resolution, while the CPU’s workload is largely resolution-independent.

Q: How does the AMD Radeon RX 7600 XT compare to its nearest rival, the RX 7600?

A: The RX 7600 XT has an average benchmark score of 20146, while the RX 7600 scores 20258, making the RX 7600 0.6% faster on average.

Q: What is the combo’s rank among all tested CPU-GPU combinations in Roblox?

A: The combo ranks 1177 out of 1800 tested combinations, placing it in the lower third of the performance distribution.

Q: What is the difference in FPS between Low and Ultra settings at 1080p?

A: At 1920x1080, Low settings produce 318.9 FPS and Ultra settings produce 208.9 FPS, a difference of 110 FPS.