Roblox

Roblox is not the kind of title that typically stresses a flagship GPU, yet the measured data for the Intel Core i5-13400F paired with the NVIDIA GeForce RTX 5090 reveals a fascinating interplay between a modest 10-core CPU and the most powerful consumer graphics card on the market. The results show a combo that is undeniably fast, consistently delivering hundreds of frames per second, but the scaling patterns across resolutions and settings expose where the bottleneck truly lies.

Resolution Scaling

The FPS drop from 1080p to 4K is dramatic and tells a clear story about the limiting component in this system. At 1080p with Low settings, the combo produces an average of 737.2 FPS. Moving to 1440p Low drops that to 491.9 FPS, a reduction of roughly 33%. Pushing further to 4K Low, the average falls to 277.3 FPS, which is about 44% lower than the 1440p result and only 38% of the 1080p peak. This steep decline indicates that the GPU is finally being engaged as resolution increases, whereas at 1080p the CPU is likely holding the system back from reaching even higher frame rates.

The pattern holds across all settings. At High settings, the 1080p average is 590.5 FPS, dropping to 394.4 FPS at 1440p (a 33% decrease) and then to 221.4 FPS at 4K (a 44% decrease from 1440p). The consistency of these percentage drops—regardless of the graphics preset—suggests that the GPU load is scaling predictably with pixel count. However, the absolute numbers remain exceptionally high even at 4K Ultra, where the combo still averages 183.4 FPS. This implies that even at the highest resolution and settings, the RTX 5090 is not being pushed anywhere near its limits, as Roblox's rendering demands are modest relative to the card's 104.8 TFLOPS of FP32 compute power.

The data implies that the 1080p results are heavily CPU-limited. With a single-thread score of 960 in 3DMark and a Cinebench R23 single-core result of 3004, the Core i5-13400F is capable, but it is clearly the ceiling at lower resolutions where the GPU has excess headroom. The gap between 1080p Low (737.2 FPS) and 1440p Low (491.9 FPS) is 245.3 FPS, which is a larger absolute gap than the 214.6 FPS difference between 1440p and 4K Low. This indicates that the transition from 1080p to 1440p is where the GPU begins to take over as the primary bottleneck, while the 4K results are purely GPU-bound.

GPU Role

The RTX 5090's specifications are almost absurd for a game like Roblox, but the data shows how its raw power translates into playable results. With a 32 GB GDDR7 memory pool on a 512-bit bus, the card has a bandwidth of 1.79 TB/s, which is far more than any sandbox title would require. The memory clock is listed at 1750 MHz with an effective 28 Gbps, and the boost clock sits at 2407 MHz. These clocks and the massive memory subsystem ensure that even at 4K Ultra, the average FPS of 183.4 does not dip anywhere near the refresh rate of typical high-end monitors.

The GPU's benchmark data further contextualizes its role. Its Passmark G3D score of 39650 and 3DMark Steel Nomad DX12 score of 14411 put it in the 94th percentile of all GPUs. In this specific game, the average FPS at 4K Ultra is 183.4, which is roughly 75% of the 4K High result of 221.4 FPS. This 38 FPS difference between Ultra and High at 4K suggests that the Ultra preset introduces effects that are more demanding on the GPU's shading units and ROPs, but the card still has plenty of headroom. The RTX 5090's 21760 shading units and 176 ROPs are processing Roblox's geometry and textures with ease, but the data shows that the GPU is not the limiting factor until 4K, and even then only at the highest settings.

Notably, the GPU's nearest rivals in the benchmark database include the NVIDIA GeForce RTX 5090 D (deltaPct of 0.1) and the AMD Radeon PRO W6600 (deltaPct of 1.3), but these comparisons are based on synthetic benchmarks, not in-game FPS. The measured FPS here is what matters, and it shows that the GPU role is one of consistent, high-throughput delivery without any signs of strain.

How This Combo Ranks

This pairing achieves a combo rank of 30 out of 1800 tested combinations in Roblox, placing it in the top 1.7% of all configurations. That ranking is impressive, but it also reflects the fact that Roblox is often CPU-bound at lower resolutions, meaning that many combos with faster CPUs can match or exceed this result despite having weaker GPUs. The rank of 30 out of 1800 indicates that this is a very high-performing setup, but not the absolute best, which suggests that a more powerful CPU could push the 1080p numbers even higher.

The CPU itself sits at the 82nd percentile among all processors, with an average benchmark score of 25236. Its nearest rival, the Intel Core i7-13620H, has an average score of 25201, a deltaPct of just 0.1, meaning they are effectively tied in synthetic tests. The AMD Ryzen 5 5600X3D is 0.5% higher, while the AMD EPYC 9474F is 0.5% lower. These tiny margins show that the i5-13400F is right in the middle of a cluster of similarly performing CPUs, and in Roblox, the single-thread performance is what matters most for high FPS. The combo's top-30 rank is therefore evidence of the RTX 5090's ability to maintain high frame rates even when the CPU is the theoretical bottleneck.

FAQ

Q: Why does the FPS drop so much from 1080p to 4K?

A: The data shows a consistent pattern where 4K averages are roughly 38-44% of the 1080p averages across all settings. For example, Low settings drop from 737.2 FPS at 1080p to 277.3 FPS at 4K. This indicates that the GPU is becoming the limiting factor as pixel count increases, whereas at 1080p the CPU is likely limiting performance.

Q: Is this combo overkill for Roblox?

A: The measured FPS values are exceptionally high, with even 4K Ultra averaging 183.4 FPS. Given that the RTX 5090 has 32 GB of GDDR7 memory and a 1.79 TB/s bandwidth, it is far more capable than Roblox demands. The combo rank of 30 out of 1800 suggests it is one of the fastest setups, but the GPU headroom is largely unused at lower resolutions.

Q: What is the best resolution to play this game with this combo?

A: Based on the data, 1440p Ultra provides an average of 323.5 FPS, which is well above any monitor's refresh rate. 4K Ultra at 183.4 FPS is also very playable. The 1080p results exceed 482 FPS even at Ultra, which is beyond what most displays can show.

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

A: The Core i5-13400F has an average benchmark score of 25236, which is nearly identical to the Intel Core i7-13620H (25201, deltaPct 0.1) and the AMD Ryzen 5 5600X3D (25365, deltaPct -0.5). This means the CPU is well-matched to its peers in synthetic tests, and its 10 cores and 16 threads are sufficient for Roblox.

Q: Does the Ultra preset significantly reduce FPS compared to High?

A: Yes, the data shows a clear step down. At 4K, Ultra averages 183.4 FPS versus 221.4 FPS for High, a difference of 38 FPS. At 1080p, the gap is larger in absolute terms: 482.4 FPS for Ultra versus 590.5 FPS for High, a 108.1 FPS difference.

Q: Is the RTX 5090's performance in Roblox limited by its drivers or the game engine?

A: The data only shows measured FPS, but the fact that 1080p Low and High differ by only 146.7 FPS (737.2 vs 590.5) suggests that the game engine or CPU is the limiting factor, not the GPU. The GPU's synthetic scores (Passmark G3D 39650, 94th percentile) indicate it is far more powerful than what Roblox utilizes.

Settings Recommendations

The measured rows provide a clear hierarchy of performance, and the choice of settings depends on the target display refresh rate. For 4K displays capped at 240 Hz, the Ultra preset at 183.4 FPS is the only option that approaches the refresh limit, but High at 221.4 FPS is smoother and still visually rich. The data suggests that High is the sweet spot for 4K, as it offers a 20% FPS increase over Ultra with minimal visual compromise in a sandbox game.

At 1440p, the Ultra preset delivers 323.5 FPS, which is sufficient for even the fastest 360 Hz monitors. Medium settings at 446.3 FPS provide a significant boost for competitive play, but the difference between High (394.4 FPS) and Ultra (323.5 FPS) is only 70.9 FPS. For 1080p, the Low preset at 737.2 FPS is only useful for extreme esports scenarios; Medium at 669.1 FPS or High at 590.5 FPS are more balanced. The Ultra preset at 482.4 FPS is still very fast, but the data shows diminishing returns in FPS per setting step at this resolution.

Given that the GPU has massive headroom, the recommendation is to prioritize visual quality. The Ultra preset at 1440p (323.5 FPS) or 4K High (221.4 FPS) are the most sensible choices, as they provide high frame rates while utilizing the RTX 5090's capabilities. For players with 1080p 240 Hz monitors, the High preset at 590.5 FPS is overkill, and Ultra at 482.4 FPS will look better.

CPU Role

The Intel Core i5-13400F has 10 cores and 16 threads, with a base clock of 2.50 GHz and a boost clock of 4.60 GHz. Its cache hierarchy includes 80 KB of L1 per core, 1.25 MB of L2 per core, and a 20 MB shared L3. In Roblox, which is known for being lightly threaded, the single-core performance is critical. The CPU's 3DMark single-thread score of 960 and Cinebench R23 single-core score of 3004 place it in a competitive position, but the data suggests it may be the limiting factor at 1080p.

The evidence for this is the FPS scaling. At 1080p Low, the combo hits 737.2 FPS. If the GPU were the limit, we would expect a more linear drop in FPS as settings increase, but the gap between Low and Ultra at 1080p is 254.8 FPS (737.2 vs 482.4). This large spread, combined with the fact that the GPU's synthetic benchmarks place it in the 94th percentile, indicates that the CPU is the bottleneck at lower resolutions. The CPU's Passmark single-thread score of 3634 further confirms that it is a solid performer, but not exceptional.

The multi-threaded performance is also relevant for background tasks, with a Cinebench R23 multicore score of 21279 and a Passmark multithread score of 25032. These numbers show that the CPU can handle system overhead while maintaining high FPS in Roblox, but the game itself likely does not utilize all 10 cores. The CPU's nearest rivals, such as the AMD Ryzen 5 5600X3D, have similar average scores, which means that swapping the CPU would not yield a major FPS change in this game.

Measured FPS Breakdown

The measured data covers three resolutions and four settings presets, providing a complete picture of performance. At 1920x1080, the Low preset averages 737.2 FPS, Medium averages 669.1 FPS, High averages 590.5 FPS, and Ultra averages 482.4 FPS. The step from Low to Medium is a drop of 68.1 FPS, while the step from High to Ultra is a drop of 108.1 FPS, indicating that Ultra is disproportionately demanding.

At 2560x1440, the averages are 491.9 FPS for Low, 446.3 FPS for Medium, 394.4 FPS for High, and 323.5 FPS for Ultra. The relative drops are smaller than at 1080p, with the Low-to-Ultra gap being 168.4 FPS. The scaling is more consistent here, with roughly 45-50 FPS differences between each preset step, suggesting a more balanced load between CPU and GPU.

At 3840x2160, the averages are 277.3 FPS for Low, 252.5 FPS for Medium, 221.4 FPS for High, and 183.4 FPS for Ultra. The Low-to-Ultra gap is 93.9 FPS, and the differences between presets are smaller in absolute terms but similar in percentage. The 4K results show that the GPU is now the primary bottleneck, as the FPS is tightly clustered around the 200 FPS mark regardless of settings.

The overall trend is clear: as resolution increases, the FPS drops consistently, and the impact of settings increases. At 1080p, the CPU limits the maximum FPS, so settings changes have a larger relative impact. At 4K, the GPU is more engaged, and the FPS is more stable across settings, but the absolute numbers remain high enough for any display.