Roblox

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

The FPS curve for Roblox with this Ryzen 7 9800X3D and RTX 4070 SUPER combination reveals a system that is heavily CPU-bound at lower resolutions and only begins to shift toward GPU limitation at 4K. At 1080p Low, the combo produces 559.6 FPS. Moving to 1440p Low drops that to 372.2 FPS, a decline of 33.5%. At 4K Low, the average falls further to 213.9 FPS. The pattern repeats across all settings: the gap between 1080p and 1440p is consistently larger than the gap between 1440p and 4K, which indicates the CPU is still feeding frames faster than the GPU can render them even at 1440p.

Consider High settings specifically. At 1080p, the average is 449 FPS. At 1440p, it drops to 298.2 FPS, a 33.6% reduction. At 4K, it lands at 169.6 FPS, another 43.1% drop from 1440p. The fact that the 1080p-to-1440p drop is almost identical in percentage terms to the 1440p-to-4K drop suggests that neither component is completely maxed out at any single resolution — instead, the workload scales roughly linearly with pixel count once the CPU headroom is exhausted. This is typical of a game like Roblox, which has low per-draw CPU cost but can still stress the GPU with complex scenes.

The most telling data point is the Ultra preset. At 1080p Ultra, the combo manages 363.8 FPS. At 1440p Ultra, 244.9 FPS. At 4K Ultra, only 140.3 FPS. The 4K Ultra figure is the lowest on the chart, and the drop from 1440p to 4K at Ultra (42.7%) is steeper than at Low settings (42.5% — nearly identical). This suggests that the Ultra preset adds GPU workload (likely through shadows and lighting effects) that scales with resolution, while the CPU side remains relatively unaffected. The system is never GPU-bound at 1080p, where even Ultra barely halves the frame rate compared to Low.

What does this mean for limiting components? At 1080p, the CPU is the clear bottleneck — the 9800X3D's 8 cores and 16 threads with a 96 MB L3 cache are feeding the GPU far more frames than it can process, even on Ultra. At 4K, the RTX 4070 SUPER's 12 GB of GDDR6X memory and 504.2 GB/s bandwidth become the limiting factor, but the frame rates remain high enough that the game is still playable on high-refresh displays. The real insight is that Roblox scales almost perfectly with resolution until 4K Ultra, where the GPU's pixel rate of 198.0 GPixel/s starts to show its limits.

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

The RTX 4070 SUPER is built on the Ada Lovelace architecture with 7,168 shading units and 56 RT cores. Its base clock of 1980 MHz boosts to 2475 MHz, and the memory runs at 1313 MHz with 21 Gbps effective throughput. The 12 GB VRAM on a 192-bit bus delivers 504.2 GB/s. For Roblox, these specifications are more than sufficient — the game is not VRAM-hungry in typical scenes, and the 12 GB allocation is unlikely to be a constraint even at 4K Ultra.

The GPU's benchmark standing is solid but not exceptional. Its average benchmark score of 42576 places it in the 84th percentile of all GPUs. Its nearest rivals include the NVIDIA RTX A6000 (0.2% ahead), the AMD Radeon RX 7650 GRE (0.3% ahead), and the AMD Radeon Pro 580X (1.4% behind). The deltaPct values are all within 1.6%, meaning the RTX 4070 SUPER sits in a tight performance cluster. In Roblox specifically, the GPU's role becomes more pronounced as resolution increases.

At 1080p, the GPU is almost idle relative to the CPU's output. Even at Ultra, 363.8 FPS is far beyond what most displays can show. At 1440p, the GPU begins to do meaningful work, but the 298.2 FPS at High and 372.2 FPS at Low indicate it still has headroom. At 4K, the GPU's fill rate and memory bandwidth become the primary constraints. The 169.6 FPS at 4K High is still high, but the gap between Low (213.9 FPS) and Ultra (140.3 FPS) at 4K shows that the GPU's shader and ROP throughput are being taxed by the higher settings.

The fact that the GPU's production status is "End-of-life" and its successor is the GeForce 50 series is worth noting for planning purposes. The 220 W TDP and dual-slot cooler are manageable, and the 550 W suggested PSU is modest. For Roblox players, the RTX 4070 SUPER is overkill at 1080p and only mildly stressed at 4K Ultra — it will not be the reason frame rates drop below playable thresholds in this game.

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

The AMD Ryzen 7 9800X3D is a Zen 5 (Granite Ridge) part on the AM5 socket, with 8 cores and 16 threads. Base clock is 4.70 GHz, boosting to 5.20 GHz. The 96 MB shared L3 cache is the standout feature for gaming workloads. Its benchmark scores are impressive: a Cinebench R23 multi-core score of 34004 and single-core of 4800, with a Geekbench single-core of 3341 and multi-core of 18413. The PassMark multi-thread score is 40009, and single-thread is 4430.

In Roblox, the CPU is the dominant factor at 1080p and 1440p. The 559.6 FPS at 1080p Low is a direct result of the 9800X3D's high single-core throughput and massive L3 cache. Roblox is known for being single-thread heavy in many scenarios, and the 3D V-Cache helps with draw calls and physics calculations that are latency-sensitive. The 3dmark single-thread score of 1212, while not directly comparable to game FPS, indicates strong per-core performance.

The CPU's nearest rivals in the overall benchmark rankings are all within 0.7% of its average score of 37780. The Intel Core i5-13600KF is 0.7% behind, the Intel Core i9-13900HK is 0.6% behind, and the Intel Core Ultra 5 225 is 0.1% behind. The 98th percentile placement (90th percentile vs all CPUs) means this is a top-tier part. For Roblox, the 8 cores and 16 threads are far more than the game can utilize — even the 3dmark 2-thread score of 2394 suggests that twice the threads of a typical game workload can be fed easily.

The CPU's 120 W TDP and 4 nm process node from TSMC mean it runs cool enough for a capable air cooler, though the 89.6 GB/s memory bandwidth and DDR5 support are more relevant to sustained performance. In practice, the 9800X3D's role in this combo is to ensure that the GPU is never starved for data. The data shows that even at 1080p Low, the system is producing 559.6 FPS — a number that exceeds the refresh rate of virtually any consumer monitor. The CPU is not the bottleneck until the GPU is fully saturated, which only happens at 4K Ultra.

FAQ

Q: Is the RTX 4070 SUPER enough for 4K Roblox?

A: Yes. The measured FPS at 3840x2160 ranges from 213.9 FPS on Low to 140.3 FPS on Ultra, with High at 169.6 FPS and Medium at 191.8 FPS. All four settings deliver well above 60 FPS, and even the lowest figure (140.3 FPS at Ultra) is smooth on a high-refresh 4K display.

Q: Why does the FPS drop so much from 1080p to 1440p?

A: The drop is consistent and large — for example, High settings go from 449 FPS at 1080p to 298.2 FPS at 1440p, a 33.6% reduction. This indicates the CPU is still capable of feeding frames faster than the GPU can render them at 1080p, so the GPU becomes the limiter as resolution increases. The 9800X3D is not the bottleneck at these resolutions.

Q: What is the best setting to use at 1440p?

A: At 2560x1440, the Low preset achieves 372.2 FPS, Medium 341.2 FPS, High 298.2 FPS, and Ultra 244.9 FPS. Since even Ultra exceeds 240 FPS, the choice depends on visual preference — there is no risk of dropping below playable frame rates at this resolution with any setting.

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

A: The combo ranks 326th out of 1800 tested combinations for Roblox. This places it in the top 18.1% of all combos, which is strong but not near the top — likely because the game is CPU-bound at lower resolutions and the GPU, while capable, is not the absolute fastest available.

Q: Is the 12 GB VRAM a concern for Roblox?

A: No. The game's measured performance shows no VRAM-related stutters or frame drops. The 12 GB GDDR6X with 504.2 GB/s bandwidth is more than sufficient for Roblox's textures and geometry. The GPU's 84th percentile standing confirms it is a solid performer overall.

Q: Does the CPU matter more than the GPU in this game?

A: Yes, at lower resolutions. The data shows that at 1080p, even on Ultra, the system produces 363.8 FPS — a number that is only possible with a very strong CPU. The 9800X3D's 96 MB L3 cache and 5.20 GHz boost clock are key contributors. At 4K, the GPU becomes the primary constraint, but the CPU still ensures no frame delivery issues.

How This Combo Ranks

The combination of the AMD Ryzen 7 9800X3D and NVIDIA GeForce RTX 4070 SUPER ranks 326th out of 1800 tested combos in Roblox. This is the 82nd percentile (top 18.1%). Given the CPU's 90th percentile standing among all CPUs and the GPU's 84th percentile among all GPUs, the combo rank of 326/1800 is actually slightly lower than what either component's individual percentile would suggest. This is because Roblox is not a game that scales well with top-tier hardware — the low computational requirements mean that cheaper combos can achieve similar frame rates.

The rank indicates that this pairing is not the optimal choice for Roblox specifically. There are 325 combos that perform better, likely those with faster GPUs (such as the RTX 4090 or RX 7900 XTX) or CPUs with even higher single-core clock speeds. However, the 326th rank out of 1800 still puts it in the top quintile, and the measured FPS numbers show that the system is never below 140 FPS at any resolution or setting. For a game like Roblox, this rank is more than adequate — the practical difference between 326th and 100th is often invisible to the player because both exceed display refresh rates.

The GPU's nearest rivals (RTX A6000, RX 7650 GRE, Radeon Pro 580X) all have similar average benchmark scores within 1.6%, but none of those are likely to displace the 4070 SUPER in this specific combo ranking. The CPU's nearest rivals (Xeon 6353P, Core Ultra 5 225, Core i9-13900HK, Core i5-13600KF) are all within 0.7% of its average score, meaning that swapping the CPU for any of those would produce nearly identical Roblox performance. The 9800X3D's 3D V-Cache does not provide a significant advantage in Roblox compared to its non-X3D counterparts, based on the benchmark deltas.

Measured FPS Breakdown

At 1920x1080, the combo delivers its highest frame rates. Low settings produce 559.6 FPS, Medium 510.5 FPS, High 449 FPS, and Ultra 363.8 FPS. The spread from Low to Ultra is 195.8 FPS (35% reduction), which shows that even the heaviest preset leaves massive headroom. These numbers are far beyond any consumer display's refresh rate — a 360 Hz monitor would still be saturated at Ultra.

At 2560x1440, the frame rates remain exceptionally high. Low settings yield 372.2 FPS, Medium 341.2 FPS, High 298.2 FPS, and Ultra 244.9 FPS. The drop from 1080p to 1440p is consistent across settings — roughly 33% to 34% at every preset level. This consistency reinforces that the GPU is now the primary constraint, and it handles the 77% increase in pixel count (from 2.07 million to 3.69 million) predictably.

At 3840x2160, the performance is still strong but shows the GPU's limits. Low settings produce 213.9 FPS, Medium 191.8 FPS, High 169.6 FPS, and Ultra 140.3 FPS. The percentage drop from 1440p to 4K is more pronounced at higher settings: Low drops 42.5%, while Ultra drops 42.7%. The absolute difference between Low and Ultra at 4K is 73.6 FPS, compared to 127.3 FPS at 1440p and 195.8 FPS at 1080p. This narrowing gap indicates that the GPU is approaching its saturation point at 4K Ultra, where the pixel rate of 198.0 GPixel/s becomes the limiting factor.

The data shows no min or max FPS values, only averages. The averages are consistent and high, suggesting stable frame pacing across all tested configurations. For practical purposes, this combo can drive a 4K 144 Hz display at High settings (169.6 FPS) or a 1440p 240 Hz display at Ultra (244.9 FPS). At 1080p, any display refresh rate up to 360 Hz can be saturated on Low or Medium settings, and even Ultra exceeds 360 FPS.