Microsoft Flight Simulator

The data for Microsoft Flight Simulator, captured with the Intel Core i5-9400 and NVIDIA GeForce RTX 3080 Ti, presents a clear hierarchy of performance across its four graphics presets. At 1080p, the Low preset delivers a measured 129 FPS average, which is the highest frame rate recorded for this combination at any resolution. However, this settings tier appears to be more of a diagnostic baseline than a practical choice for a visually rich flight simulator. The Medium preset at 1080p produces a 115.3 FPS average, a substantial improvement in visual fidelity for a modest performance cost of roughly 11% relative to Low. The High preset at 1080p yields 94.5 FPS, which is still above the 60 FPS threshold for smooth gameplay, while the Ultra preset drops to 92.3 FPS.

Settings Recommendations

The benchmark data suggests that the High preset is the optimal balance for this CPU-GPU pairing. At 1080p, High produces 94.5 FPS, which is only a 2.4% reduction in frame rate compared to Ultra (92.3 FPS), yet it likely reduces the rendering load on the system, as indicated by the performance scaling at higher resolutions. Moving to 1440p, the High preset maintains a playable 76 FPS average, whereas Ultra drops to 74.9 FPS. The gap between High and Ultra narrows as resolution increases, but High consistently holds a small performance advantage. The Medium preset offers higher frame rates—115.3 FPS at 1080p and 100.3 FPS at 1440p—but the jump from Medium to High appears to be the point where the visual quality gains outweigh the frame rate loss.

For users targeting 4K, the High preset at 3840x2160 yields 55.4 FPS, which is just below the 60 FPS ideal but generally acceptable for a simulation genre where precise control input is more critical than competitive frame rates. The Ultra preset at 4K produces 55.6 FPS, a negligible difference of 0.2 FPS, suggesting that the graphics card is the limiting factor at this resolution, not the settings overhead. The Low preset at 4K, at 93.7 FPS, demonstrates that the hardware has significant headroom when visual effects are stripped away. However, recommending Low would be a disservice to the RTX 3080 Ti’s capabilities. The data indicates that High is the sweet spot—it provides a substantial visual upgrade over Medium while staying within a comfortable performance margin at all three tested resolutions.

CPU Role

The Intel Core i5-9400 is a six-core, six-thread processor from the Coffee Lake era, with a base clock of 2.90 GHz and a boost clock of 4.10 GHz. Its benchmark scores, such as a Cinebench R23 multi-core score of 7969 and a single-core score of 1125, place it at the 50th percentile among all CPUs, indicating a mid-range standing. In Microsoft Flight Simulator, which is known for being heavily dependent on single-thread performance for its simulation logic and draw-call processing, the i5-9400’s relatively modest single-core score becomes a bottleneck at lower resolutions. The data supports this: at 1080p, the frame rates are high (129 FPS on Low), but they do not scale infinitely with the GPU’s power, suggesting the CPU is setting a ceiling.

The CPU’s 9 MB of shared L3 cache and dual-channel DDR4 memory support are typical for its generation. The measured FPS deltas across resolutions show that the i5-9400 can adequately feed the RTX 3080 Ti at 1080p and 1440p, as evidenced by the 121.1 FPS average at 1440p Low. However, the performance drop from 1080p Low (129 FPS) to 4K Low (93.7 FPS) is a 27% reduction, which is a smaller relative decline than what would be expected if the GPU were the sole bottleneck, indicating that the CPU’s processing power is contributing to the frame rate ceiling. The processor’s nearest rivals, such as the Intel Core i3-10305 (deltaPct 0.2) and the Intel Core i7-8809G (deltaPct -0.6), have nearly identical average benchmark scores, reinforcing that this chip is a solid but unexceptional performer for this workload.

GPU Role

The NVIDIA GeForce RTX 3080 Ti is a high-end Ampere architecture card with a GA102 chip, 12 GB of GDDR6X memory on a 384-bit bus, and a memory bandwidth of 912.4 GB/s. Its boost clock is 1665 MHz, and its FP32 compute rating is 34.10 TFLOPS. The GPU’s benchmark percentile of 83 indicates it outperforms the vast majority of graphics cards, and its average benchmark score of 41224 places it within 1.6% of the NVIDIA GeForce RTX 3090 (deltaPct -0.5) and the AMD Radeon Pro 5300 (deltaPct -0.9). This is a powerful card, but in this specific game, its role is heavily influenced by the CPU.

At 4K resolution, the GPU’s workload intensifies significantly. The measured FPS at 4K High is 55.4, which is a 41% drop from 1080p High (94.5 FPS). This substantial decline indicates that the RTX 3080 Ti is being taxed by the high pixel count and the game’s detailed scenery rendering. The 12 GB VRAM is likely sufficient for 4K textures, and the high memory bandwidth helps with streaming large terrain data. The data shows that at 4K, the frame rates across settings are tightly grouped (55.4 FPS High, 55.6 FPS Ultra, 73.4 FPS Medium), which suggests that the GPU is the primary limiting component at this resolution. The card’s 80 RT cores and 320 tensor cores do not appear to provide a specific advantage in this simulator’s standard benchmark runs, but its raw rasterization power is what drives the 4K numbers.

How This Combo Ranks

Within the database of tested CPU-GPU combinations for Microsoft Flight Simulator, this pairing of the Intel Core i5-9400 and the NVIDIA GeForce RTX 3080 Ti ranks 575th out of 1795 combos. This places it in the top third of all tested configurations, which is a respectable standing given the CPU’s mid-range status. The ranking reflects that the system’s performance is above average, but not exceptional. The i5-9400’s 50th percentile CPU performance likely drags down the combined ranking, as the RTX 3080 Ti’s 83rd percentile GPU performance is substantially higher. If paired with a stronger processor, the same GPU would likely achieve a higher combo rank, as the GPU’s potential is not fully realized in this pairing.

In terms of rivals, the GPU’s nearest competitors in the benchmark database include the RTX 3090 (deltaPct -0.5) and the RTX 5070 (deltaPct -1.1), showing that the 3080 Ti is within a narrow performance band of these cards. The combo’s rank of 575, out of 1795, indicates that while it is not a top-tier configuration, it is well above the median. The measured FPS data, particularly the 121.1 FPS at 1440p Low and the 100.3 FPS at 1440p Medium, shows that this combo is capable of high refresh rate gameplay at mainstream resolutions, which is a strong result for a simulator that often struggles with high frame rates.

Resolution Scaling

The transition from 1080p to 4K provides clear evidence of where the bottleneck lies. At High settings, the average FPS drops from 94.5 at 1080p to 76 at 1440p, a 19.6% reduction, and then to 55.4 at 4K, a further 27.1% reduction from 1440p. This scaling pattern is characteristic of a GPU-bound scenario at higher resolutions, where the rendering load increases exponentially with pixel count. Conversely, at Low settings, the FPS drops from 129 at 1080p to 121.1 at 1440p (a 6.1% drop) and then to 93.7 at 4K (a 22.6% drop from 1440p). The smaller drop from 1080p to 1440p at Low settings suggests that the CPU is holding the frame rate back at 1080p, as the GPU has spare capacity that cannot be utilized.

The data shows that the frame rate scaling from 1080p to 4K is non-linear. At Ultra settings, the 1080p score is 92.3 FPS, which drops to 74.9 FPS at 1440p and 55.6 FPS at 4K. The performance gap between 1080p and 4K at Ultra is 39.8%, which is less than the 41.4% drop at High settings. This indicates that at Ultra, the CPU is more involved in the performance ceiling, as the GPU is already heavily loaded. Overall, the resolution scaling analysis suggests that for this combo, 1440p is the sweet spot where the CPU and GPU are more balanced. At 1080p, the i5-9400 limits the maximum frame rate, while at 4K, the RTX 3080 Ti becomes the primary constraint. The medium preset at 4K (73.4 FPS) shows that a compromise is possible, but the high preset’s 55.4 FPS at 4K is the realistic ceiling for a visually rich experience without sacrificing detail.