Roblox

Roblox is a sandbox title with a long history, but the measured results for this pairing show it is anything but a lightweight load. The AMD Ryzen 5 8400F and NVIDIA GeForce RTX 4090 produce frame rates that are consistently far beyond display refresh rate targets, making this a combo that is effectively held back by the game’s engine limits rather than by hardware capability. The data indicates that at every tested resolution, even the most demanding preset stays well above the threshold for smooth play, and the main question for a builder is not whether this system can run Roblox, but which settings waste the least of its enormous headroom.

CPU Role

The AMD Ryzen 5 8400F is a 6-core, 12-thread processor based on the Zen 4 architecture, built on a 4 nm process at TSMC. Its base clock is 4.20 GHz and its boost clock reaches 4.70 GHz. The chip carries 64 KB of L1 cache per core, 1 MB of L2 per core, and a shared 16 MB of L3 cache. Memory support is DDR5 over a dual-channel bus, with a bandwidth of 83.2 GB/s. The CPU’s benchmark profile shows a single-thread score of 951 in 3DMark, a Cinebench R23 single-core score of 2943, and a multicore score of 20851. In PassMark, the single-thread result is 3685 and the multithread score is 24389. Its average benchmark score is 25005, placing it in the 77th percentile of all CPUs tested.

For Roblox, the CPU’s role is significant because the game is known for being heavily single-thread dependent in many of its simulation and physics tasks. The measured FPS data reveals that the Ryzen 5 8400F never becomes the limiting factor in this pairing. At 1920x1080 with Low settings, the average FPS reaches 711, which is a clear indicator that the CPU is feeding the GPU with far more frames than any display can show. Even at the most demanding tested condition — 3840x2160 Ultra — the average FPS is 175, which is still far above the 144 Hz mark that many high-refresh monitors use. The gap between the low and ultra presets at 1080p is 247 FPS (711 vs 464), which suggests that the CPU’s performance is not the bottleneck; if it were, lowering resolution would not yield such large gains. Instead, the data shows that the GPU is doing most of the heavy lifting at higher settings, while the CPU’s 6 cores and 12 threads provide ample headroom for Roblox’s single-threaded workloads.

Compared to its nearest rivals, the Ryzen 5 8400F sits within a narrow band. The AMD Ryzen 5 7500F has an average score of 24964, which is 0.2% lower, while the Intel Core i7-11850H is 0.3% higher at 24935, and the Intel Core i7-13620H is 0.4% higher at 24911. The AMD EPYC 9474F is 0.4% higher at 25103. This means the 8400F’s CPU performance is essentially tied with those parts, and in Roblox, the measured FPS shows that this level of single-thread and multicore performance is more than sufficient. The CPU’s 16 MB of L3 cache is modest compared to larger desktop parts, but the game’s low complexity means it rarely stresses cache capacity. The 4.70 GHz boost clock is the key metric here, as it directly influences the single-thread performance that Roblox relies on.

GPU Role

The NVIDIA GeForce RTX 4090 is built on the Ada Lovelace architecture, using the AD102 chip fabricated on a 5 nm process at TSMC. It has 16384 shading units, 512 texture mapping units, and 176 ROPs. The GPU’s base clock is 2235 MHz and its boost clock is 2520 MHz. Memory consists of 24 GB of GDDR6X on a 384-bit bus, delivering 1.01 TB/s of bandwidth, with a memory clock of 1313 MHz (21 Gbps effective). The card’s compute capability is reflected in its FP32 performance of 82.58 TFLOPS and its pixel rate of 443.5 GPixel/s. The RTX 4090’s benchmark scores include a 3DMark Steel Nomad DX12 result of 9223, a Geekbench OpenCL score of 255416, and a Vulkan score of 271631. Its PassMark G3D score is 38194, and its average benchmark score is 60347, placing it in the 88th percentile of all GPUs.

In Roblox, the RTX 4090’s massive VRAM and bandwidth are largely irrelevant because the game does not use such resources heavily. However, the data shows that the GPU is still the primary driver of FPS changes when settings are adjusted. At 1920x1080, moving from Low to Ultra drops the average FPS from 711 to 464, a reduction of 247 FPS. That is a 34.7% decrease, which is substantial. At 2560x1440, the same settings change goes from 474 to 310, a drop of 164 FPS (34.6%). At 3840x2160, the Low to Ultra transition goes from 268 to 175, a drop of 93 FPS (34.7%). The consistency of this percentage drop across all resolutions indicates that the GPU’s work scales predictably with settings, and the RTX 4090’s raw power is what enables those high absolute numbers. The GPU’s boost clock of 2520 MHz is high, and the 24 GB of VRAM never becomes a constraint, as the game’s textures and geometry are simple.

The RTX 4090’s nearest rivals in the database are professional and workstation cards, which is unusual for a gaming GPU. The Intel Arc Pro A60 has an average score of 60326, which is 0% different, while the AMD Radeon Pro Vega 48 is 0.3% higher at 60140. The AMD Radeon Pro W6600M is 2.5% higher at 61896, and the AMD Radeon PRO V710 is 2.9% higher at 58657. These comparisons are based on aggregate benchmark scores, not Roblox-specific performance, but they indicate that the RTX 4090’s compute capabilities are in a class of its own for gaming. In Roblox, the measured FPS shows that the GPU is never bottlenecked by its memory bandwidth or its core count; instead, the game’s engine becomes the limiting factor at high settings, which is why the FPS does not scale linearly with resolution.

Settings Recommendations

The measured FPS data provides clear guidance for settings selection. At every resolution, the Low preset delivers the highest average FPS, but the question is whether that is necessary. For a game like Roblox, which is often played on laptops and low-end PCs, this hardware is overkill, so the goal should be to maximize visual quality while maintaining a comfortable frame rate.

At 1920x1080, the Ultra preset averages 464 FPS, which is far above any display’s refresh rate. The High preset averages 572 FPS, and Medium averages 647 FPS. The Low preset averages 711 FPS. Since the difference between Ultra and Low is 247 FPS, and Ultra still provides 464 FPS, the Ultra preset is the best choice for 1080p because it offers the best visuals without any playability concern. The minimum FPS is only recorded for Medium (550 FPS), but even that is exceptionally high. For a 144 Hz monitor, Ultra is the clear pick.

At 2560x1440, the Ultra preset averages 310 FPS, which is still more than double a 144 Hz refresh rate. High averages 382 FPS, Medium 432 FPS, and Low 474 FPS. The 164 FPS gap between Low and Ultra is noticeable, but 310 FPS is still far beyond what any consumer display can show. Ultra is the recommended setting here as well, because the visual quality improvement is worth the FPS drop, and the average remains high enough to avoid any stutter on typical high-refresh panels.

At 3840x2160, the Ultra preset averages 175 FPS, which is just above a 144 Hz target but below a 240 Hz target. High averages 216 FPS, Medium 244 FPS, and Low 268 FPS. For 4K gaming, the Ultra preset is still viable, especially for a 144 Hz display, because 175 FPS is above that threshold. However, if a user has a 240 Hz 4K monitor (which is rare), the High preset at 216 FPS would be a better fit. The Medium preset at 244 FPS offers the best balance for very high refresh 4K displays, but for most users, Ultra at 175 FPS is the recommended choice because the visual quality is highest and the frame rate remains smooth.

The data shows that the Medium preset is the only one with recorded minimum FPS values (208 at 4K, 367 at 1440p, 550 at 1080p). This suggests that Medium may have more consistent frame pacing, but the lack of min FPS data for other presets means we cannot definitively compare stability. Still, given the high averages, any preset will provide a smooth experience.

How This Combo Ranks

This combination of the AMD Ryzen 5 8400F and NVIDIA GeForce RTX 4090 ranks 144th out of 3711 tested combos in Roblox, placing it in the top 4% of all systems tested. This is a strong result, but it is not the absolute top, which suggests that other CPU/GPU pairings can achieve even higher FPS in this game. The ranking is based on actual measured FPS data, not synthetic benchmarks, so it reflects real-world performance.

The rank of 144 out of 3711 means that there are 143 other combos that perform better in Roblox. Given that the RTX 4090 is one of the most powerful GPUs available, the limiting factor is likely the CPU’s single-thread performance. The Ryzen 5 8400F’s 3DMark single-thread score of 951 is respectable, but other CPUs with higher single-thread scores (such as those with higher boost clocks) could push FPS even higher. However, the measured FPS at 1080p Low (711) suggests that the game is already running near its engine’s limits, so the improvement from a faster CPU would be marginal.

The combo rank also reflects the fact that this is a desktop pairing with a high-end GPU, which is overkill for Roblox. Many lower-end GPUs paired with faster CPUs might achieve similar FPS because the game is not graphically demanding. This rank of 144 is therefore proof of the GPU’s raw power, but it also indicates that a more balanced build (e.g., a mid-range GPU with a high-clock CPU) could offer similar Roblox performance at lower cost. For a builder focused solely on Roblox, this combo is far beyond what is necessary, but the data shows it still performs admirably.

FAQ

Q: Is the AMD Ryzen 5 8400F sufficient for Roblox, or does it bottleneck the RTX 4090?

A: The measured FPS data shows no CPU bottleneck. At 1920x1080 Low, the average FPS is 711, which is far beyond any display’s refresh rate. The CPU’s single-thread performance (3DMark single-thread score of 951, Cinebench R23 single-core of 2943) is more than enough for Roblox’s demands.

Q: What is the best settings preset to use with this combo at 1440p?

A: The Ultra preset at 2560x1440 averages 310 FPS, which is more than double a 144 Hz refresh rate. Since the visual quality is highest and the frame rate is still exceptionally high, Ultra is the recommended preset for 1440p.

Q: How much FPS difference is there between Low and Ultra settings at 4K?

A: At 3840x2160, the Low preset averages 268 FPS, while the Ultra preset averages 175 FPS. This is a drop of 93 FPS, or approximately 34.7%. Even at Ultra, the frame rate remains above 144 Hz.

Q: Does the RTX 4090’s 24 GB of VRAM matter for Roblox?

A: No. Roblox is not a graphically demanding game and does not use large amounts of VRAM. The 24 GB of GDDR6X memory is far more than the game requires, and the measured FPS shows no memory-related limitations.

Q: How does this combo rank compared to other tested systems in Roblox?

A: The combo rank is 144 out of 3711 tested combos, which places it in the top 4% of all systems. This is a strong result, though it indicates that some other CPU/GPU pairings achieve even higher FPS, likely due to faster single-thread CPU performance.

Q: Is the 711 FPS result at 1080p Low a realistic representation of gameplay?

A: The data shows 711 FPS as the average for 1920x1080 Low settings. This is a measured result, and while it is exceptionally high, it reflects the hardware’s capability. Most displays cannot show this many frames, so the practical benefit is limited to lower latency and headroom for frame drops.

Measured FPS Breakdown

The measured FPS data covers three resolutions and four settings presets, providing a complete picture of performance.

At 1920x1080, the Low preset delivers the highest average FPS at 711. The Medium preset averages 647 FPS, with a minimum of 550 and a maximum of 744. High averages 572 FPS, and Ultra averages 464 FPS. The gap between Low and Ultra is 247 FPS, and even the lowest average (Ultra) is far above any common refresh rate.

At 2560x1440, the Low preset averages 474 FPS. Medium averages 432 FPS, with a minimum of 367 and a maximum of 496. High averages 382 FPS, and Ultra averages 310 FPS. The difference between Low and Ultra is 164 FPS, and all presets remain above 300 FPS.

At 3840x2160, the Low preset averages 268 FPS. Medium averages 244 FPS, with a minimum of 208 and a maximum of 281. High averages 216 FPS, and Ultra averages 175 FPS. The difference between Low and Ultra is 93 FPS, and even the Ultra preset stays above 144 FPS.

The data shows a consistent pattern: as resolution increases, the FPS drops across all presets, but the relative difference between Low and Ultra remains roughly constant at about 34-35%. This indicates that the GPU’s workload scales uniformly with settings, and the RTX 4090’s performance is sufficient to maintain high frame rates at all tested configurations. The only minimum FPS values recorded are for Medium presets, which suggests that Medium may have more stable frame pacing, but the lack of min data for other presets prevents a full comparison. Overall, this combo delivers playable frame rates at every resolution and setting, with the only practical limitation being the refresh rate of the connected display.