Roblox

Roblox is an unusual benchmark target because its visual load is modest while its frame-rate ceiling is tied heavily to CPU draw-call throughput. For this Intel Core i5-13400F and NVIDIA GeForce RTX 4080 pairing, the measured data reveals a system that is overwhelmingly GPU-limited at 4K, but becomes increasingly CPU-bound as resolution drops. The combo ranks 250th out of 3711 tested combinations, placing it in the top 7% of all configurations, which is a strong result given that Roblox's engine often caps performance well before modern high-end hardware reaches its limits.

FAQ

Q: What is the best measured frame rate for this combo in Roblox?

A: The highest average FPS recorded is 643 at 1080p with Low settings. The lowest average is 158 FPS at 4K with Ultra settings, showing that even the most demanding preset stays well above refresh-rate territory.

Q: How does this combo rank against other tested systems?

A: It ranks 250th out of 3711 total combinations, which places it in the 93rd percentile. This is notable because many higher-ranked combos likely use newer or more expensive CPUs, but the i5-13400F's 10 cores and 16 threads appear sufficient for Roblox's workload.

Q: Does the RTX 4080's 16 GB VRAM matter for Roblox?

A: The measured data does not indicate any VRAM-related bottleneck. At 4K Ultra, the average FPS is 158, which suggests the GPU is processing frames well within its memory capacity. Roblox's blocky assets and moderate texture sizes are unlikely to stress the 16 GB GDDR6X pool.

Q: Which setting provides the largest FPS jump?

A: At 4K, moving from Ultra to High increases average FPS from 158 to 195, a gain of 37 FPS (23%). The jump from Low to Medium is smaller at 22 FPS (from 243 to 221), showing diminishing returns as settings drop.

Q: Is there a resolution where the CPU becomes the limiting factor?

A: Yes. At 1080p, the gap between Low (643 FPS) and High (517 FPS) is 126 FPS, while at 4K the same settings gap is only 48 FPS (243 vs 195). This compression at higher resolutions indicates the GPU is the primary constraint at 4K, while the CPU's single-thread performance (3,191 in Cinebench R23 single-core) starts to cap frame rates at 1080p.

Q: How does the RTX 4080 compare to its closest rivals in general benchmarks?

A: The RTX 4080 scores 54,247 average in GPU benchmarks, which is nearly identical to the RTX 4080 SUPER (54,209, 0.1% difference). It also outperforms the AMD Radeon Pro W5700X by 1.1% and the RX 6750 GRE by 2.6%, though these differences are minor in real-world Roblox play.

GPU Role

The RTX 4080's specifications are far beyond Roblox's graphical requirements, yet the data shows meaningful scaling with settings. The GPU runs at a boost clock of 2505 MHz with 9728 shading units, and its 16 GB of GDDR6X memory operates at 22.4 Gbps effective, yielding 716.8 GB/s of bandwidth. For a game like Roblox, which uses simple geometry and often relies on user-generated content with variable optimization, the GPU's raw compute (48.74 TFLOPS FP32) is rarely the deciding factor.

However, the measured FPS at 4K tells a clear story. At Ultra settings, the average is 158 FPS, which drops to 195 at High and 221 at Medium. This 63 FPS spread between Ultra and Medium suggests that the GPU's pixel throughput (280.6 GPixel/s) and texture rate (761.5 GTexel/s) are being exercised, particularly with effects like shadows and lighting that scale with resolution. The fact that Low settings at 4K reach 243 FPS indicates that the GPU can handle the resolution easily when shader complexity is reduced.

The RTX 4080's position in the benchmark hierarchy reinforces its capability. It sits at the 86th percentile of all GPUs, with an average benchmark score of 54,247. Its nearest rival, the RTX 4080 SUPER, is essentially tied at 0.1% difference, meaning the standard 4080 loses nothing meaningful in Roblox. The gap to the AMD Radeon RX 6750 GRE (-2.6%) and Radeon 8060S (-2.7%) is also negligible for this title, as Roblox rarely stresses the GPU to its limits at 1440p or below.

How This Combo Ranks

The combination of i5-13400F and RTX 4080 achieves rank 250 out of 3711 tested combos, placing it in the top 6.7% of all systems. This is a strong result, but it raises a question: why not higher? The CPU's percentile is 77th among all processors, while the GPU sits at 86th. The gap suggests that Roblox's engine may not fully utilize the CPU's multi-threading capabilities, leaving some performance on the table.

Looking at the CPU's nearest rivals in general benchmarks, the i5-13400F scores 25,292 average, which is essentially tied with the AMD Ryzen 9 6900HS (25,284, 0% difference) and Ryzen 7 6800H (25,201, 0.4% ahead). The Intel Core 5 120 and Ryzen 5 5600X3D are both 0.3% behind. In Roblox specifically, the i5-13400F's 10 cores (6 performance, 4 efficiency) and 16 threads provide ample headroom, but the game's single-threaded draw-call processing may cap performance around 600 FPS at 1080p, as seen in the Low settings result.

The combo's rank of 250 suggests that many systems with faster single-core CPUs or higher clock speeds achieve better Roblox performance. The i5-13400F boosts to 4.60 GHz, which is respectable, but not exceptional for a 2023 processor. For a game that rewards per-core performance, this CPU's 3,191 single-core score in Cinebench R23 is decent but not top-tier, explaining why the combo doesn't crack the top 100.

Measured FPS Breakdown

At 1080p, the RTX 4080 delivers exceptional frame rates across all settings. Low settings produce an average of 643 FPS, which drops to 585 at Medium and 517 at High. Ultra settings still manage 420 FPS. The Medium preset shows a minimum of 497 FPS and maximum of 673 FPS, indicating consistent performance without severe dips. The 126 FPS difference between Low and High suggests that the CPU is beginning to limit the GPU at these high frame rates, as the RTX 4080 should theoretically push beyond 600 FPS even at High settings.

Moving to 1440p, the averages are still very high: 429 FPS at Low, 390 at Medium, 345 at High, and 280 at Ultra. The Medium preset records a minimum of 332 FPS and maximum of 449 FPS. The scaling from 1080p to 1440p shows a reduction of roughly 33% across settings, which is less than the theoretical pixel count increase (2.25x), indicating that the GPU is not the sole bottleneck. At 1440p, the system is still delivering well above any monitor's refresh rate.

At 4K, the frame rates become more moderate but remain impressive. Low settings average 243 FPS, Medium 221 FPS, High 195 FPS, and Ultra 158 FPS. The Medium preset shows a minimum of 188 FPS and maximum of 254 FPS, meaning even the worst-case scenario stays above 144 Hz. The drop from 1440p to 4K is significant: 429 to 243 FPS at Low (43% reduction) and 280 to 158 FPS at Ultra (44% reduction). This consistency across settings suggests that resolution scaling is the dominant factor, not settings complexity.

Settings Recommendations

For players seeking the highest frame rates at 1080p, Low settings deliver 643 FPS, but the jump to Medium only costs 58 FPS (585 FPS) while providing better visual quality. Given that most 1080p monitors cap at 240 Hz or 360 Hz, Medium is the optimal choice as it stays well above those thresholds with a minimum of 497 FPS.

At 1440p, the data supports High settings as the best balance. The average of 345 FPS is still far above any 1440p monitor's refresh rate (typically 165-240 Hz), and the gap from Medium (390 FPS) is only 45 FPS. Ultra at 280 FPS is also viable, but High offers a 23% FPS improvement with minimal visual impact in Roblox's art style.

For 4K, the recommendation depends on the display. If using a 144 Hz monitor, Ultra at 158 FPS is playable but leaves no headroom for drops. Medium at 221 FPS with a minimum of 188 FPS is the safest choice, ensuring consistent frame times even in complex scenes. High at 195 FPS is a middle ground, but the Medium preset's minimum of 188 FPS versus High's lack of min/max data suggests Medium has better frame pacing. For maximum smoothness, Medium at 4K provides the best combination of visual fidelity and performance.

CPU Role

The Intel Core i5-13400F is a 10-core, 16-thread processor based on Raptor Lake architecture, manufactured on Intel's 10 nm process. It has a base clock of 2.50 GHz and boost clock of 4.60 GHz, with 20 MB of shared L3 cache. In general benchmarks, it scores 22,604 in Cinebench R23 multi-core and 3,191 in single-core, placing it at the 77th percentile of all CPUs.

Roblox is primarily a single-threaded game for physics and game logic, but the rendering pipeline can use multiple threads. The i5-13400F's performance cores handle the primary game thread, while the efficiency cores assist with background tasks. The 3dmark single-thread score of 960 and the 2-thread score of 1,880 indicate that the CPU's per-core performance is adequate for Roblox's needs, but not exceptional.

The measured FPS at 1080p Low (643 FPS) is likely near the CPU's limit for this game. The fact that 1440p Low only drops to 429 FPS (33% reduction) while 4K Low drops to 243 FPS (62% reduction from 1080p) suggests that the CPU is the primary limiter at 1080p and 1440p. The i5-13400F's 4.60 GHz boost clock is sufficient to keep up with the RTX 4080 at these resolutions, but at 1080p, the GPU is often waiting for the CPU to process draw calls.

Resolution Scaling

The FPS scaling from 1080p to 4K reveals where the bottleneck shifts. At Low settings, the averages are 643 (1080p), 429 (1440p), and 243 (4K). This represents a 33% drop from 1080p to 1440p and a 43% drop from 1440p to 4K. The pixel count increases by 2.25x from 1080p to 4K, but FPS only drops by 62%, indicating that the GPU is not fully saturated until 4K.

At Ultra settings, the pattern is similar: 420 (1080p), 280 (1440p), and 158 (4K). The drop from 1080p to 1440p is 33%, and from 1440p to 4K is 44%. This consistency across settings suggests that resolution scaling is governed by the GPU's fill rate and memory bandwidth, not by settings complexity. The RTX 4080's 716.8 GB/s bandwidth and 280.6 GPixel/s pixel rate are being exercised more heavily at 4K, but the GPU still maintains playable frame rates.

The data implies that at 1080p, the system is CPU-bound, as evidenced by the relatively small FPS difference between Low (643) and High (517) — only 20%. At 4K, the same settings difference is 35% (243 vs 195), showing that the GPU becomes the limiting factor. For users with high-refresh 1080p monitors, the CPU is the constraint; for 4K users, the GPU is doing most of the work. This is a classic example of a balanced system where the bottleneck shifts based on resolution, with the i5-13400F proving adequate for 1440p and the RTX 4080 excelling at 4K.