Roblox

The Intel Core i5-11400F and NVIDIA GeForce RTX 4090 pairing in Roblox produces an extraordinary performance ceiling, but the data reveals a system where the CPU is the primary bottleneck at lower resolutions. This combination delivers playable 4K Ultra frame rates, yet the GPU's immense power is left largely untapped as resolution drops, with the 6-core processor struggling to feed the flagship graphics card.

CPU Role

The Intel Core i5-11400F is a 6-core, 12-thread processor from the Rocket Lake architecture, running on a 14 nm process. Its base clock of 2.60 GHz boosts up to 4.40 GHz, providing the single-threaded performance that Roblox’s engine typically relies upon. The CPU’s 12 MB of shared L3 cache and dual-channel DDR4 memory support contribute to its overall capability, but its position in the benchmark hierarchy is telling. With a percentile ranking of 75 against all CPUs and an average benchmark score of 17181, the i5-11400F sits in the upper-midrange tier.

The benchmark results show a clear pattern: single-thread performance is modest, with a 3dmark_single_thread score of 868 and a Passmark single-thread score of 2981. Multi-threaded scores are more robust, with Cinebench R23 multicore reaching 14372. In Roblox, this translates to a situation where the CPU can handle the game’s logic and physics at high frame rates, but it cannot keep pace with the RTX 4090’s raw output. The data indicates that at 1080p, the i5-11400F is the limiting factor, as the FPS figures plateau despite the GPU having significant headroom. The CPU’s nearest rivals, such as the AMD Ryzen 7 5700U and Intel Core i7-1260P, show nearly identical average scores (17189 and 17212 respectively), placing the i5-11400F in a competitive but not dominant position for this workload.

GPU Role

The NVIDIA GeForce RTX 4090 is a behemoth built on the Ada Lovelace architecture with a 5 nm process. It features 16384 shading units, 512 TMUs, and 176 ROPs, backed by 24 GB of GDDR6X memory on a 384-bit bus, delivering a staggering 1.01 TB/s of bandwidth. Its boost clock of 2520 MHz and 82.58 TFLOPS of FP32 performance place it in the 91st percentile of all GPUs, with an average benchmark score of 66473. The GPU’s Passmark G3D score of 38194 and 3dmark Steel Nomad DX12 score of 9223 confirm its flagship status.

In Roblox, the RTX 4090’s role is paradoxical: it provides the theoretical capability to run the game at thousands of FPS, but the measured data shows it is heavily constrained by the CPU. At 4K Ultra, the GPU is finally given enough work to stretch its legs, but even then, the 173.1 FPS average is far below what the card could theoretically deliver in less CPU-bound titles. The GPU’s 24 GB VRAM is more than sufficient for Roblox’s modest texture requirements, meaning memory capacity is never a limiting factor. The RTX 4090’s nearest rivals, including the NVIDIA Tesla T4 and Tesla P40, have comparable average scores (66733 and 66127), but none of these are gaming-focused cards, highlighting the 4090’s unique position in the desktop segment.

Resolution Scaling

The measured FPS data reveals a textbook case of CPU bottlenecking that diminishes as resolution increases. At 1080p, the average frame rates across settings range from 465.4 FPS (Ultra) to 681.1 FPS (Low). The jump from Low to Ultra represents a 31.6% drop in performance, but more importantly, the absolute numbers are capped by the processor. Moving to 1440p, the FPS figures decrease by roughly 20-30% across all settings, with the Low preset dropping from 681.1 to 479.2 FPS. This scaling suggests the GPU is beginning to take on more of the workload, but the CPU is still the primary limiter.

At 4K, the picture changes dramatically. The Low preset yields 270.1 FPS, which is 60.3% lower than the 1080p Low result. The Ultra preset drops to 173.1 FPS, a 62.8% reduction from its 1080p counterpart. This scaling pattern is consistent with a system where the GPU load increases significantly at higher resolutions, allowing the RTX 4090 to finally become the dominant factor. The data indicates that the crossover point occurs somewhere between 1440p and 4K, where the GPU’s rendering workload becomes heavy enough to obscure the CPU’s limitations. At 4K, the gap between Low and Ultra narrows to 56%, compared to the 46% gap at 1080p, showing that resolution scaling compresses the settings-based performance differences.

Measured FPS Breakdown

The benchmark results provide exact figures for twelve combinations of resolution and settings. At 1920x1080, the Low preset delivers an average of 681.1 FPS, Medium drops to 646.1 FPS, High to 575 FPS, and Ultra to 465.4 FPS. These numbers show a consistent downward trend, with the Ultra preset costing 31.6% of the Low preset’s performance. At 2560x1440, the averages are 479.2 FPS (Low), 433.1 FPS (Medium), 381.3 FPS (High), and 309.5 FPS (Ultra). The relative drop from Low to Ultra is 35.4%, slightly steeper than at 1080p.

At 3840x2160, the performance falls to 270.1 FPS (Low), 247.2 FPS (Medium), 214.7 FPS (High), and 173.1 FPS (Ultra). The Low-to-Ultra penalty increases to 35.9%, indicating that the GPU is becoming the more significant constraint. The data shows that even at 4K Ultra, the system maintains an average FPS well above the 144 Hz refresh rate of most gaming monitors, meaning this combo never drops below playable thresholds in any tested configuration. The margin between High and Ultra at 4K is 41.6 FPS, while at 1080p it is 109.6 FPS, further confirming that the CPU is the limiting factor at lower resolutions.

How This Combo Ranks

In the database of tested combinations, the i5-11400F and RTX 4090 pairing ranks 69th out of 1800 combos for Roblox. This places it in the top 4% of all tested systems, which is impressive but not the absolute peak. The ranking suggests that while the GPU is one of the most powerful available, the CPU holds the combo back from the very top tier. The 69th rank implies that there are 68 other combinations that achieve higher average FPS in Roblox, likely featuring more powerful processors paired with this same GPU or similar high-end cards.

The rank is particularly notable when considering the CPU’s 75th percentile standing against all CPUs. The discrepancy between the CPU’s relative position (75th percentile) and the combo’s top-4% ranking highlights the outsized influence of the RTX 4090. The data suggests that the GPU is doing the heavy lifting in this pairing’s overall performance, but the CPU prevents it from reaching the absolute top. The combo’s rank of 69 also indicates that while the system is exceptionally fast, there is measurable headroom for improvement if paired with a stronger processor, as evidenced by the 68 combos that outperform it.

FAQ

Q: Is the Intel Core i5-11400F sufficient for the RTX 4090 in Roblox?

A: The data shows the CPU is the limiting factor at 1080p and 1440p, with FPS capped around 681.1 at 1080p Low. At 4K, the GPU becomes more relevant, with the combo achieving 173.1 FPS at Ultra, indicating the CPU can still deliver high frame rates but leaves significant GPU performance unused.

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

A: The highest measured average is 681.1 FPS at 1920x1080 with Low settings. The lowest is 173.1 FPS at 3840x2160 with Ultra settings, meaning every tested configuration exceeds 170 FPS.

Q: How does the RTX 4090’s 24 GB VRAM affect Roblox performance?

A: Roblox’s texture and geometry requirements are well below the 24 GB capacity, so VRAM is never a bottleneck. The GPU’s 1.01 TB/s bandwidth and 82.58 TFLOPS compute are the relevant factors, but they are constrained by the CPU at lower resolutions.

Q: What is the combo’s rank among all tested systems?

A: The combo ranks 69th out of 1800 tested combinations, placing it in the top 4% of all systems in the database for Roblox performance.

Q: Does increasing resolution from 1080p to 4K reduce FPS proportionally?

A: No, the drop is steeper than proportional. The 1080p Low average of 681.1 FPS falls to 270.1 FPS at 4K Low, a 60.3% reduction. This indicates the GPU workload increases significantly at higher resolutions, shifting the bottleneck away from the CPU.

Q: Is there a significant difference between High and Ultra settings?

A: At 1080p, the gap is 109.6 FPS (575 vs 465.4). At 4K, the gap narrows to 41.6 FPS (214.7 vs 173.1), showing that Ultra settings have a larger relative impact when the GPU is more heavily loaded.

Settings Recommendations

The measured data supports a clear recommendation for 4K Ultra as the best experience, despite it having the lowest average FPS of 173.1. This frame rate is still exceptionally high, and the visual fidelity gains from Ultra settings in a sandbox game like Roblox are substantial. For users with 144 Hz or 165 Hz monitors, the 4K High preset at 214.7 FPS offers a better balance, providing a 24% performance increase over Ultra while maintaining high visual quality.

For 1440p displays, the Ultra preset at 309.5 FPS is the recommended choice, as it remains far above any refresh rate ceiling while delivering maximum graphical detail. At 1080p, the Ultra preset at 465.4 FPS is the obvious pick, as the CPU bottleneck means lower settings do not yield proportionally higher frame rates—the jump from Ultra to Low only adds 215.7 FPS, which is imperceptible on most monitors. The data shows that the Low preset at any resolution does not meaningfully improve the experience beyond what the CPU can deliver, so users should prioritize higher settings. The Ultra preset is only advisable if the GPU is the limiting factor, which occurs predominantly at 4K, where the 173.1 FPS average still exceeds the refresh rate of virtually all consumer displays.