Roblox

The Intel Core i5-9400 paired with the AMD Radeon RX 7700 XT delivers a remarkably fluid Roblox experience across all tested resolutions, but the performance scaling reveals a system that is heavily front-loaded for high refresh-rate gaming. The data indicates that the CPU becomes the primary constraint as resolution drops, while the GPU remains capable of pushing frame rates well beyond what most displays can render.

Resolution Scaling

The FPS deltas between 1080p, 1440p, and 4K clearly illustrate where the bottleneck shifts. At 1080p with Low settings, the combo produces 421.1 FPS, which is an extraordinary figure for a sandbox game. Moving to 1440p Low, the average drops to 278.5 FPS, a reduction of roughly 34%. At 4K Low, the average falls further to 157.3 FPS, which is still exceptionally playable but represents a 63% decrease from the 1080p result.

This scaling pattern suggests that at 1080p, the Intel Core i5-9400 is the limiting factor. The 6-core, 6-thread processor simply cannot feed the RX 7700 XT enough draw calls to saturate its rendering pipeline. The 4.10 GHz boost clock helps, but the lack of additional threads caps performance in a title that is not heavily multi-threaded. As resolution increases to 4K, the GPU's workload grows, and the frame rate drops to a level where the CPU can keep up with the GPU's demands.

The gap between Low and Ultra settings widens with resolution. At 1080p, the difference between Low and Ultra is 148.7 FPS (421.1 vs 272.4). At 1440p, that gap shrinks to 94 FPS (278.5 vs 184.5). At 4K, the gap is 54 FPS (157.3 vs 103.3). This indicates that the GPU is becoming more dominant in determining performance at higher resolutions, while at 1080p, the CPU's limitations prevent the GPU from fully flexing its muscle even at Ultra settings.

GPU Role

The AMD Radeon RX 7700 XT brings 12 GB of GDDR6 memory on a 192-bit bus, providing 432.0 GB/s of bandwidth. This memory configuration is more than sufficient for Roblox's asset streaming, even at 4K Ultra, where the game's blocky textures and simple geometry do not stress VRAM capacity. The 3456 shading units and 96 ROPs are the key drivers of the raw pixel throughput, which is why the card maintains 103.3 FPS at 4K Ultra.

The GPU's clock behavior is telling. With a base clock of 1435 MHz and a boost clock of 2544 MHz, the card has a significant overclocking headroom built into its boost algorithm. The game clock of 2171 MHz is the sustained frequency under typical gaming loads, and the data suggests that Roblox is not a worst-case power scenario. The card's FP32 throughput of 35.17 TFLOPS is ample for the simple shaders used in Roblox, meaning the GPU is rarely the limiting factor except at the highest resolution and quality settings.

The RX 7700 XT's percentile rank of 73 among all GPUs, with an average benchmark score of 30097, places it in the upper tier of graphics cards. Its nearest rival, the NVIDIA GeForce RTX 5060, scores 30109 with a deltaPct of 0%, indicating these two cards are effectively tied in synthetic benchmarks. In real-world Roblox testing, the RX 7700 XT proves its worth by delivering 4K Ultra performance that exceeds the 60 FPS threshold by a comfortable margin.

How This Combo Ranks

This specific pairing achieves a combo rank of 799 out of 1800 tested combinations in Roblox. That places it in the 56th percentile of all tested combos, which is a solid middle-tier result. Given that the CPU is a modest 6-core part from the Coffee Lake generation and the GPU is a modern RDNA 3.0 card, this ranking is largely attributable to the GPU pulling the combo upward.

The CPU's average benchmark score of 2305 puts it at the 50th percentile of all CPUs, with its nearest rivals being the Intel Core i3-10305 (2300, +0.2%) and the Intel Core i3-1125G4 (2299, +0.2%). This suggests the i5-9400 is a thoroughly average processor in synthetic tests. However, in Roblox, the combination with the RX 7700 XT yields frame rates that are far above what the CPU's percentile alone would suggest. This is because Roblox is not a heavily threaded workload, and the i5-9400's 4.10 GHz boost clock is sufficient for the game's single-threaded logic.

The GPU's percentile of 73 is the dominant factor in this ranking. The RX 7700 XT's average benchmark score of 30097 is 13 times higher than the CPU's score, indicating that the GPU is the star of this combo. The 799th rank out of 1800 combos is a reasonable outcome for a pairing of a mid-range CPU from 2018 with a high-end GPU from 2023.

Measured FPS Breakdown

The measured data provides a clear picture of performance across all settings and resolutions. At 1080p, the Low preset delivers 421.1 FPS, Medium 380.7 FPS, High 336.7 FPS, and Ultra 272.4 FPS. All four settings exceed 240 FPS, making this combo ideal for high-refresh-rate 1080p monitors. The step from Low to Medium costs 40.4 FPS, while the step from High to Ultra costs 64.3 FPS, showing that Ultra is a significant load increase.

At 1440p, the results remain exceptionally high. Low delivers 278.5 FPS, Medium 256.3 FPS, High 224.3 FPS, and Ultra 184.5 FPS. Even the Ultra preset stays above 180 FPS, which is well beyond the refresh rate of most 1440p gaming monitors. The scaling from 1080p to 1440p is roughly 66-68% of the 1080p frame rate, indicating a predictable GPU-bound scaling pattern.

At 4K, the frame rates become more moderate but still playable. Low delivers 157.3 FPS, Medium 146.2 FPS, High 129 FPS, and Ultra 103.3 FPS. The 4K Ultra result is just above the 100 FPS mark, which is impressive for a game that is not known for heavy graphics demands. The drop from Medium to High at 4K is 17.2 FPS, and from High to Ultra is 25.7 FPS, showing that Ultra has a substantial cost at this resolution.

CPU Role

The Intel Core i5-9400 has 6 cores and 6 threads, with a base clock of 2.90 GHz and a boost clock of 4.10 GHz. This is a Coffee Lake Refresh part built on Intel's 14 nm process, with 9 MB of shared L3 cache. The lack of Hyper-Threading means it can only handle 6 concurrent threads, which is a limitation in modern multi-threaded games. However, Roblox is not a multi-threaded-heavy title, and the data confirms that the CPU can sustain high frame rates when the GPU is not the bottleneck.

The CPU's Cinebench R23 multi-core score of 7969 and single-core score of 1125 indicate a balanced performance profile. The single-core score is what matters most for Roblox, as the game's physics and scripting often run on a single thread. The 4.10 GHz boost clock is sufficient to keep frame rates high at 1080p, but the 1080p Low result of 421.1 FPS is likely near the CPU's practical limit. Pushing beyond that would require a CPU with higher single-thread performance or more cores.

The memory bandwidth of 42.7 GB/s from dual-channel DDR4 is adequate for this workload. Roblox does not require massive memory throughput, and the CPU's L3 cache of 9 MB helps keep frequently accessed data close. The CPU's TDP of 65 W indicates a power-efficient part that won't generate excessive heat in a compact build.

Settings Recommendations

For 1080p gaming, the High preset at 336.7 FPS is the sweet spot. It offers a 64.3 FPS improvement over Ultra while maintaining a frame rate that far exceeds any display's refresh rate. The Medium preset at 380.7 FPS is only a 44 FPS gain over High, so High provides a better visual experience for a minimal performance cost. Low at 421.1 FPS is unnecessary unless the user has a 360 Hz monitor and wants to maximize frame pacing.

For 1440p, the High preset at 224.3 FPS is recommended. It provides a 39.8 FPS advantage over Ultra while still being an extremely fluid experience. The Medium preset at 256.3 FPS is a viable alternative for users who prioritize frame rate over graphical fidelity, but High offers a better balance of visual quality and performance. The Ultra preset at 184.5 FPS is still playable, but it is not worth the performance hit when High is so close in visual quality.

For 4K, the Medium preset at 146.2 FPS is the best choice. It provides a 17.2 FPS advantage over High and a 42.9 FPS advantage over Ultra, while the visual difference between Medium and High in Roblox is minimal due to the game's art style. The Low preset at 157.3 FPS is only 11.1 FPS faster than Medium, so Medium is clearly the superior option. The Ultra preset at 103.3 FPS is playable but leaves no headroom for frame drops during intense gameplay moments.

Across all resolutions, the data shows that High at 1080p, High at 1440p, and Medium at 4K deliver the best balance of visual quality and performance for this combo. The RX 7700 XT has enough headroom to handle these presets without thermal or power constraints, and the i5-9400 can keep up with the frame rates at these settings.