Roblox

Roblox is a notoriously CPU-bound sandbox title, and the pairing of AMD’s Ryzen 5 4600G with NVIDIA’s flagship RTX 5090 D creates an extreme test of that dynamic. The measured data reveals a system where the graphics card is almost never the limiting factor, even at 4K. This combination produces extraordinary frame rates that are ultimately capped by the processor’s Zen 2 architecture rather than the GPU’s immense Blackwell 2.0 compute power.

Resolution Scaling — how FPS drops from 1080p to 4K and what it says about the limiting component

The frame rate scaling across resolutions tells a clear story about where the bottleneck resides. At 1080p with High settings, the combo produces 562 FPS. Moving to 1440p High, that number drops to 417 FPS, a decrease of 145 FPS (approximately 26%). Stepping up to 4K High, the average falls to 236 FPS, which is 181 FPS lower than the 1080p result. This scaling pattern is surprisingly mild for a game, indicating that the GPU is not being stressed anywhere near its limits.

The data becomes even more telling when examining the Low preset. At 1080p Low, the system hits 606 FPS. At 1440p Low, it achieves 518 FPS. At 4K Low, it still manages 293 FPS. The gap between 1080p Low and 4K Low is 313 FPS, or roughly a 48% reduction. For a GPU with 32 GB of GDDR7 memory and a 512-bit bus, this drop is almost entirely attributable to the CPU’s inability to feed frames fast enough at lower resolutions, forcing the processor to work harder as pixel count decreases.

The most interesting observation comes from the Medium preset, which is the only setting tier with min/max FPS data. At 4K Medium, the average is 267 FPS with a minimum of 227 FPS and maximum of 307 FPS. At 1080p Medium, the average jumps to 587 FPS. The fact that the 4K Medium average (267 FPS) is higher than the 4K High average (236 FPS) suggests that the GPU has plenty of headroom, and the performance delta is driven by CPU workload rather than pixel throughput. The RTX 5090 D’s 104.8 TFLOPS FP32 performance is effectively wasted in this title, as the Ryzen 5 4600G becomes the ceiling.

GPU Role — VRAM, clocks, and how they relate to this game's results

The RTX 5090 D is a monster on paper: 32 GB of GDDR7 memory, a 512-bit bus delivering 1.79 TB/s of bandwidth, and a boost clock of 2407 MHz. In Roblox, however, these specifications are largely irrelevant. The game’s visual complexity is not demanding enough to utilize even a fraction of this memory capacity or bandwidth. The pixel rate of 423.6 GPixel/s and texture rate of 1,636.8 GTexel/s are far beyond what any sandbox-style rendering requires.

The GPU’s percentile ranking of 92 (vs all GPUs) and average benchmark score of 77,712 place it in the top tier of graphics hardware. Its nearest rivals, such as the AMD Radeon RX 6850M XT (deltaPct -1.6) and the NVIDIA Tesla P100 PCIe 16 GB (deltaPct -2.4), are all within a few percentage points in synthetic tests. Yet in Roblox, the 5090 D’s performance is dictated by the CPU’s output. The measured FPS at 4K Ultra (191 FPS) versus 4K High (236 FPS) shows a 45 FPS difference, which is a larger gap than between High and Medium. This suggests that even at Ultra settings, the GPU is not the limiting factor; the CPU is simply running out of headroom to generate draw calls.

Interestingly, the GPU’s DirectX 12 benchmark score (219 in Passmark) is lower than its DirectX 11 score (371), which is unusual. This indicates that the card’s architecture may not be perfectly optimized for all API paths, but Roblox’s engine likely doesn’t stress these paths heavily anyway. The 16-pin power connector and 575 W TDP are irrelevant in this context, as the GPU is likely idling or running at low utilization while waiting for the CPU to deliver frames.

CPU Role — cores, clocks, and how they relate to this game's results

The AMD Ryzen 5 4600G is a 6-core, 12-thread processor based on Zen 2 architecture, clocked at 3.70 GHz base and 4.20 GHz boost. Its Cinebench R23 multi-core score of 13,593 and single-core score of 1,919 place it in the 71st percentile of all CPUs. In Roblox, which is heavily dependent on single-thread performance, this CPU’s capabilities are the primary determinant of the system’s frame rates.

The data shows that the CPU’s single-thread score of 726 in 3DMark and 1,460 in Geekbench are modest by modern standards. Its nearest rivals in overall benchmark scores include the AMD Ryzen 3 PRO 5355GE (deltaPct 0.1) and the Intel Core 7 150U (deltaPct 0.6), which are all similarly positioned. This explains why the frame rates, while high, do not scale linearly with the GPU’s power. At 1080p Low, the 606 FPS result appears to be near the CPU’s practical limit, as increasing resolution to 1440p Low only drops to 518 FPS, and 4K Low still yields 293 FPS.

The 4600G’s 8 MB of shared L3 cache and 51.2 GB/s memory bandwidth are modest, but they are sufficient for Roblox’s relatively simple physics and world interactions. The 4000 series processor’s integrated Radeon Vega 7 graphics are irrelevant here, as the discrete GPU handles all rendering. What matters is the CPU’s ability to process game logic, player actions, and network updates. The 4.20 GHz boost clock is decent, but the Zen 2 architecture lacks the IPC improvements of newer generations, which is why the system cannot push beyond 606 FPS even at the lowest settings.

How This Combo Ranks — use comboRankInGame vs other tested combos

In the database of tested combinations, this specific pairing of Ryzen 5 4600G and RTX 5090 D ranks 105th out of 3,010 combos for Roblox. This places it in the top 3.5% of all tested systems, which is impressive given the CPU’s age. However, the ranking is somewhat misleading. The RTX 5090 D is a top-tier GPU that should theoretically rank higher, but the CPU drags the overall performance down.

The rank of 105 means there are 104 other combinations that achieve higher frame rates in Roblox. These are likely systems with newer, higher-clocked CPUs that can better feed the GPU. The fact that this combo still ranks in the top 3.5% speaks to the raw power of the RTX 5090 D, even when bottlenecked. If the CPU were upgraded, the same GPU would likely push this combo into the top 10 or even top 5, given that the GPU’s average benchmark score of 77,712 is in the 92nd percentile of all GPUs.

The deltaPct values for the CPU’s rivals (ranging from -0.8% to +0.6%) show that the 4600G is essentially on par with its closest competitors in synthetic tests. Yet in Roblox, these small CPU differences can translate to large FPS swings. This is a case where the combo rank is more indicative of the CPU’s limitations than the GPU’s strengths. The 105th rank out of 3,010 is a solid result, but it leaves performance on the table.

Measured FPS Breakdown — resolution by resolution, settings by settings, exact numbers

At 1920x1080, the system delivers its highest frame rates. The Low preset achieves 606 FPS, which is the peak measurement across all configurations. Medium settings yield 587 FPS with a minimum of 499 FPS and a maximum of 675 FPS. High settings produce 562 FPS, and Ultra settings drop to 507 FPS. The spread from Low to Ultra is 99 FPS, indicating that even at 1080p, the CPU is the primary constraint, as the GPU could easily handle higher settings without a significant penalty.

Moving to 2560x1440, the frame rates remain exceptionally high. Low settings produce 518 FPS, Medium yields 471 FPS (with a min of 401 FPS and max of 542 FPS), High delivers 417 FPS, and Ultra drops to 338 FPS. The delta between Low and Ultra at 1440p is 180 FPS, which is larger than at 1080p, suggesting that the GPU is starting to contribute slightly to the workload, but the CPU still dominates.

At 3840x2160, the system still maintains triple-digit frame rates. Low settings produce 293 FPS, Medium yields 267 FPS (with a min of 227 FPS and max of 307 FPS), High delivers 236 FPS, and Ultra drops to 191 FPS. The spread from Low to Ultra is 102 FPS, which is similar to the 1080p spread. This consistency across resolutions strongly suggests that the limiting factor is the CPU’s single-thread performance, not the GPU’s rendering capabilities. The minimum FPS at 4K Medium (227 FPS) is still higher than the average FPS at 4K Ultra (191 FPS), showing that settings play a significant role in CPU load.

FAQ

Q: Why does the RTX 5090 D not produce higher frame rates in Roblox?

A: The data shows that the Ryzen 5 4600G CPU is the bottleneck. The frame rates scale minimally across resolutions (from 606 FPS at 1080p Low to 293 FPS at 4K Low), indicating the GPU is never fully utilized.

Q: Is this combo better at 1080p or 4K for Roblox?

A: The measured FPS is highest at 1080p, reaching 606 FPS on Low settings and 507 FPS on Ultra. However, even at 4K Ultra, the system maintains 191 FPS, which is far above playable thresholds for most users.

Q: What is the impact of the Medium preset's min/max FPS readings?

A: The Medium preset is the only one with complete min/max data. At 1080p, it ranges from 499 to 675 FPS, while at 4K it ranges from 227 to 307 FPS. This shows frame time consistency is better at lower resolutions.

Q: How does the CPU's benchmark performance relate to its Roblox results?

A: The Ryzen 5 4600G has a Cinebench R23 single-core score of 1,919 and a Geekbench single-core score of 1,460. These modest scores correlate with the system's inability to exceed 606 FPS, as Roblox relies heavily on single-thread performance.

Q: Does the GPU's 32 GB VRAM matter for Roblox?

A: The measured data does not show any VRAM-related limitations. The game's visual complexity is low, and the GPU's 32 GB GDDR7 memory is far more than needed, even at 4K Ultra settings.

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

A: It ranks 105th out of 3,010 tested combos for Roblox, placing it in the top 3.5%. This is a strong result, but the CPU's age prevents the GPU from achieving its full potential.

Settings Recommendations

For the best experience, the data suggests that the High preset at 1440p offers an optimal balance. At 2560x1440 High, the system delivers 417 FPS, which is well above any display’s refresh rate. The drop to 4K High (236 FPS) is still excellent, but the 1440p High setting provides a 181 FPS advantage over 4K while looking nearly as sharp in most sandbox scenarios.

If maximum frame rates are the goal, the 1080p Low preset at 606 FPS is the clear winner, but this sacrifices visual quality. The Medium preset at 1080p (587 FPS) is nearly as fast and likely offers better visual fidelity for a minimal performance cost. At 4K, the Medium preset (267 FPS) is the best choice, as it outperforms High (236 FPS) by 31 FPS while still looking good. The Ultra preset at any resolution provides diminishing returns: at 1080p it drops to 507 FPS, and at 4K it falls to 191 FPS, which is still playable but represents a significant performance hit for marginal visual gains. Given the CPU bottleneck, the Medium preset appears to be the sweet spot, offering the best frame rate stability (as shown by the min/max data) without sacrificing too much visual quality.