Red Dead Redemption 2

The Intel Core i5-9400 paired with the NVIDIA GeForce RTX 5080 delivers a distinctive performance profile in Red Dead Redemption 2, characterized by substantial headroom in the graphics card being constrained by an older six-core processor. Benchmark results show that the RTX 5080, which sits in the 89th percentile of all GPUs, is capable of far higher frame rates than this pairing consistently achieves, particularly at lower resolutions where the CPU becomes the primary bottleneck. At 1080p, the gap between Low and Ultra settings is only 49.4 FPS, indicating that the processor's six threads limit the GPU's ability to stretch its legs, while at 4K the spread widens to 57.3 FPS as the graphics card takes on more of the workload. The data suggests that users should prioritize graphical fidelity over raw frame rate, as the CPU will cap performance regardless of how low settings are dropped.

Settings Recommendations

The measured frame rates across four presets and three resolutions reveal that the High preset offers the most balanced experience for this combination. At 4K, High produces 60.5 FPS average, which clears the standard for smooth gameplay, while the Ultra preset drops to 46.1 FPS, a 23.8% reduction that makes the visual upgrade difficult to justify. The Medium preset at 4K delivers 74.8 FPS, but High provides a better ratio of visual quality to performance, as the 14.3 FPS difference between Medium and High is smaller than the 28.7 FPS gap between High and Ultra. For users with 1440p displays, High achieves 94 FPS, which is comfortably above the 60 FPS threshold and leaves room for demanding scenes, while Ultra at 70.9 FPS remains playable but sacrifices the headroom needed for consistency. At 1080p, the High preset's 121.9 FPS average is the sweet spot, as dropping to Medium only gains 7.7 FPS, and the Low preset's 142.1 FPS comes at a significant cost to visual fidelity. The Ultra preset at 1080p, at 92.7 FPS, still exceeds 90 FPS but offers diminishing returns compared to High. Given that the CPU limits maximum frame rates, selecting High across all resolutions ensures the GPU is utilized effectively without overburdening the processor, and the data shows this preset consistently outperforms Ultra by margins ranging from 23.8% at 4K to 31.5% at 1080p.

CPU Role

The Intel Core i5-9400 is a Coffee Lake Refresh processor with six cores and six threads, lacking hyper-threading, which places it in the 50th percentile of all CPUs tested. Its base clock of 2.90 GHz and boost clock of 4.10 GHz are modest by modern standards, and its Cinebench R23 scores of 7969 multi-core and 1125 single-core reflect a processor that was mid-range at launch in 2018. In Red Dead Redemption 2, this CPU's role is primarily to feed frames to the RTX 5080, and the data indicates it becomes the limiting factor as resolution decreases. At 1080p, the difference between Low and High settings is only 20.2 FPS, and between Low and Ultra is 49.4 FPS, which is narrow compared to the GPU's capability, suggesting the CPU saturates before the graphics card can reach its potential. The six threads are fully utilized by the game's engine, which is known for heavy CPU usage, and the lack of additional threads means the processor cannot maintain high frame rates when the GPU is underutilized. Moving to 1440p, the frame rates at Low (129.7 FPS) and Medium (116.6 FPS) are still capped below what the RTX 5080 could deliver, but the gap between Low and Ultra narrows to 58.8 FPS, indicating the GPU begins to take on more responsibility. At 4K, the CPU bottleneck diminishes significantly, as the Low preset hits 103.4 FPS and Ultra drops to 46.1 FPS, a spread of 57.3 FPS that shows the GPU is now the dominant factor. The Cinebench R20 single-core score of 472 and multi-core score of 3346 place this CPU near rivals like the Intel Core i3-10305, which scores 2300 average with a 0.2% delta, meaning the i5-9400 is only marginally ahead of a modern i3 in synthetic tests, reinforcing that its age limits game performance. The 9 MB of shared L3 cache and dual-channel DDR4 memory support at 42.7 GB/s bandwidth are sufficient for this game, but the architecture's six threads struggle to keep up with the RTX 5080's frame generation capability, particularly at 1080p where the CPU's 50th percentile ranking is exposed.

FAQ

Q: What is the best resolution to use with this CPU and GPU combination?

A: The data shows that 1440p High is the most consistent choice, delivering 94 FPS average, which balances the CPU's limitations with the GPU's strength. At 1080p, the CPU caps performance, while at 4K, the GPU becomes the bottleneck, but 1440p allows both components to work in harmony.

Q: How much performance is lost by using Ultra settings instead of High?

A: At 4K, Ultra drops to 46.1 FPS from High's 60.5 FPS, a 23.8% reduction. At 1440p, the drop is 23.1 FPS (from 94 to 70.9), and at 1080p, it is 29.2 FPS (from 121.9 to 92.7), making Ultra consistently the worst value in terms of performance per visual improvement.

Q: Is the RTX 5080 being held back by the i5-9400?

A: Yes, benchmark results indicate CPU limiting at 1080p, where Low settings only reach 142.1 FPS despite the GPU's 89th percentile ranking. The narrow frame rate spread between Low and Medium settings (12.5 FPS at 1080p) suggests the processor cannot push the GPU to higher outputs, while at 4K the spread widens, showing the GPU becomes the primary driver.

Q: How does this CPU compare to its nearest rivals in synthetic benchmarks?

A: The i5-9400 has an average benchmark score of 2305, which is 0.2% higher than the Intel Core i3-10305's 2300 score and 0.4% higher than the Intel Xeon E-2134's 2295 score. It is 0.6% behind the Intel Core i7-8809G's 2319 score, indicating it performs nearly identically to a modern i3 in general benchmarks.

Q: What frame rate can users expect at 4K with Medium settings?

A: The measured average is 74.8 FPS, which is 14.3 FPS higher than High settings and 28.7 FPS higher than Ultra, making Medium the best option for 4K users who prioritize smoothness over maximum visual detail.

Q: Does the game run better at 1080p or 1440p with this combo?

A: At 1080p High, the average is 121.9 FPS, while at 1440p High it is 94 FPS, a 27.9 FPS difference. However, the 1080p results are more CPU-bound, meaning the extra resolution at 1440p does not proportionally reduce frame rates, so 1440p offers a better balance of visual clarity and performance.

How This Combo Ranks

This combination of the Intel Core i5-9400 and NVIDIA GeForce RTX 5080 ranks 145th out of 1687 tested combos in Red Dead Redemption 2, placing it in the top 8.6% of all configurations. This rank is notably higher than the CPU's 50th percentile ranking would suggest, indicating that the RTX 5080's strength compensates for the processor's age in this specific game. The GPU's average benchmark score of 59188, which sits 1.6% above the Intel Arc A570M and 2.5% above the Intel Arc A580, shows it is a top-tier graphics card, and its 89th percentile ranking confirms it is capable of far more than this CPU allows. The gap between the CPU's rank and the combo's rank suggests that at higher resolutions, the GPU carries the load, but at 1080p, the combo underperforms relative to what the GPU alone could achieve. Compared to other combos, this pairing is likely held back by the i5-9400's six threads, as many of the 1542 combos ranked below it likely use more modern CPUs with higher single-thread performance. The 1687 total combos include a wide range of processors and graphics cards, and this rank of 145 indicates that most configurations with an RTX 5080-level GPU outperform it, but it still beats a vast majority of all tested systems. The data shows that the combo's position is driven by the GPU's raw power, which pushes it to the top 10% despite the CPU's limitations, but users should expect better results with a newer processor.

Resolution Scaling

The frame rate scaling from 1080p to 4K reveals how the bottleneck shifts between CPU and GPU as resolution increases. At High settings, the average frame rate drops from 121.9 FPS at 1080p to 94 FPS at 1440p, a 22.9% reduction, and then to 60.5 FPS at 4K, a further 35.6% reduction from 1440p. This scaling pattern shows that the GPU becomes progressively more dominant as pixel count rises, while at 1080p, the CPU limits the maximum frame rate to around 142 FPS on Low settings. The Low preset demonstrates this most clearly: at 1080p, it achieves 142.1 FPS, but at 1440p it drops to 129.7 FPS (a 8.7% reduction), and at 4K it falls to 103.4 FPS (a 20.3% reduction from 1440p). The relatively small drop from 1080p to 1440p on Low settings (12.4 FPS) compared to the larger drop from 1440p to 4K (26.3 FPS) indicates that the CPU is the limiting factor at lower resolutions, as the GPU has enough headroom to handle the extra pixels. In contrast, the Ultra preset shows a more linear scaling: 92.7 FPS at 1080p, 70.9 FPS at 1440p (a 23.5% drop), and 46.1 FPS at 4K (a 35.0% drop from 1440p), which is typical of a GPU-bound scenario. The Medium preset follows a similar pattern, with 129.6 FPS at 1080p, 116.6 FPS at 1440p (a 10.0% drop), and 74.8 FPS at 4K (a 35.8% drop). This data suggests that for users targeting 4K, the CPU's age is less of a concern, as the GPU workload dominates, but at 1080p and 1440p, the i5-9400's six threads prevent the RTX 5080 from reaching its full frame rate potential, particularly on Low and Medium settings where the CPU is the clear limiting component.