Roblox

The Intel Core i5-9400 paired with the AMD Radeon RX 7800 XT ranks 653rd out of 1,800 tested combinations in Roblox. This places the combo in the upper-middle tier of the database, meaning it outperforms roughly two-thirds of all recorded configurations while sitting below the top performers. The ranking reflects a system that is far from the ceiling for this title, but one that delivers a consistently smooth experience at most settings, as the measured frame rates demonstrate.

How This Combo Ranks

The 653rd position out of 1,800 combos indicates that this pairing is competitive but not elite for Roblox. The CPU’s standalone percentile of 50 versus all processors suggests it is exactly mid-pack, while the GPU’s percentile of 76 versus all graphics cards shows it is the stronger half of this duo. In practice, the data shows the GPU doing most of the heavy lifting, which is typical for a sandbox title where draw calls and object counts can stress the processor. The CPU’s nearest rivals include the Intel Core i3-10305 with an average score of 2,300 (0.2% ahead), the Intel Core i3-1125G4 at 2,299 (0.2% ahead), and the Intel Xeon E-2134 at 2,295 (0.4% ahead); the only faster adjacent chip is the Intel Core i7-8809G at 2,319, which sits 0.6% ahead. These deltas are minuscule, meaning the i5-9400 is effectively interchangeable with those parts in raw compute, but Roblox’s engine appears responsive to the RX 7800 XT’s capabilities, pushing the combo’s overall rank higher than the CPU’s percentile alone would suggest.

GPU Role

The AMD Radeon RX 7800 XT is built on the RDNA 3.0 architecture with a Navi 32 chip, featuring 16 GB of GDDR6 memory on a 256-bit bus. Its memory bandwidth of 624.1 GB/s is substantial for a game like Roblox, which often loads many small assets; the high bandwidth helps maintain smooth traversal through user-generated worlds. The GPU’s base clock is 1295 MHz, with a game clock of 2124 MHz and a boost clock of 2430 MHz. These clocks are relatively high, allowing the card to sustain high frame rates without relying solely on the CPU. The 60 ray tracing cores and 3840 shading units provide ample parallelism, though Roblox does not heavily utilize ray tracing in most experiences. The GPU’s Passmark G3D score of 24,176 and its 76th percentile ranking confirm it is a strong performer, and in this title it appears to be the primary driver of the measured FPS, since the frame rates scale more dramatically with resolution than with settings changes alone.

Resolution Scaling

The measured data shows a clear pattern: as resolution increases, average FPS drops, but the drops are not uniform across settings. At 1920x1080 Low, the combo achieves 451.4 FPS, while at 2560x1440 Low it falls to 299.3 FPS, a reduction of roughly one-third. Moving to 3840x2160 Low yields 170 FPS, which is about 57% lower than the 1440p figure. This steep decline indicates that at lower settings, the GPU is being pushed harder as pixel count grows, but the CPU still has headroom. For High settings, the pattern is similar: 363.8 FPS at 1080p, 244.8 FPS at 1440p, and 139.1 FPS at 4K. The Ultra preset shows the most significant scaling penalty, dropping from 295.5 FPS at 1080p to 199 FPS at 1440p, then to 113.4 FPS at 4K. The fact that even 4K Ultra stays above 60 FPS suggests the limiting component shifts from CPU-bound at 1080p to GPU-bound at 4K, but the i5-9400 still manages to feed the RX 7800 XT adequately in most scenarios.

Settings Recommendations

The optimal experience depends on the target resolution. At 1920x1080, the Medium preset delivers 408.7 FPS, which is only about 42 FPS behind Low but offers better visual quality; the Ultra preset still hits 295.5 FPS, so players with high-refresh monitors can afford to max out settings. At 2560x1440, High is the sweet spot at 244.8 FPS, as it stays well above the 200 FPS mark while Medium (273.7 FPS) offers only a modest gain for a noticeable drop in fidelity; Ultra at 199 FPS is still playable but begins to show the CPU’s limitations. At 3840x2160, Medium at 157.3 FPS provides a balanced mix, since High (139.1 FPS) is only 18 FPS slower but visually richer; Low (170 FPS) is unnecessary unless chasing the absolute maximum refresh rate. For most users, High at 1440p or Medium at 4K will yield the best combination of smoothness and visual detail, given that the data shows diminishing returns beyond those points.

Measured FPS Breakdown

At 1920x1080, the combo produces its highest frame rates across all presets. Low averages 451.4 FPS, Medium 408.7 FPS, High 363.8 FPS, and Ultra 295.5 FPS. The gap between Low and Ultra is 155.9 FPS, indicating that the GPU has plenty of headroom at this resolution and the CPU is likely the bottleneck at lower presets. At 2560x1440, the numbers drop but remain high: Low 299.3 FPS, Medium 273.7 FPS, High 244.8 FPS, and Ultra 199 FPS. The difference between Low and Ultra narrows to 100.3 FPS, showing that the GPU starts to take on more load. At 3840x2160, the pattern shifts dramatically: Low 170 FPS, Medium 157.3 FPS, High 139.1 FPS, and Ultra 113.4 FPS. Here, the spread from Low to Ultra is only 56.6 FPS, meaning the GPU is the dominant constraint, and even the lowest preset cannot exceed 170 FPS. Across all resolutions, the Ultra preset consistently sits about 15-20% below High, while Low is always the fastest but with diminishing returns as resolution climbs.

FAQ

Q: Is this combo capable of 4K gaming in Roblox?

A: Yes. At 3840x2160, the average FPS ranges from 113.4 on Ultra to 170 on Low, all well above the 60 FPS threshold for smooth play.

Q: Which preset gives the highest frame rate at 1080p?

A: Low settings produce the highest average at 451.4 FPS, followed by Medium at 408.7 FPS, High at 363.8 FPS, and Ultra at 295.5 FPS.

Q: How does the CPU compare to its nearest rivals?

A: The Intel Core i5-9400 has an average benchmark score of 2,305, which is 0.2% ahead of the Intel Core i3-10305 (2,300) and the Intel Core i3-1125G4 (2,299), 0.4% ahead of the Intel Xeon E-2134 (2,295), and 0.6% behind the Intel Core i7-8809G (2,319).

Q: What is the GPU’s memory configuration?

A: The AMD Radeon RX 7800 XT features 16 GB of GDDR6 memory on a 256-bit bus, with a bandwidth of 624.1 GB/s and an effective memory clock of 19.5 Gbps.

Q: Does the frame rate drop more from 1080p to 1440p or from 1440p to 4K?

A: The drop is larger from 1440p to 4K. For example, on High settings, moving from 1080p to 1440p reduces FPS by 119, while moving from 1440p to 4K reduces it by 105.7, but the percentage drop is steeper at higher resolutions.

Q: What is the launch MSRP of the GPU?

A: The AMD Radeon RX 7800 XT has a launch MSRP of 499 USD.