Microsoft Flight Simulator

# Microsoft Flight Simulator with Intel Core i5-9400 + AMD Radeon RX 6650 XT

The Intel Core i5-9400 paired with the AMD Radeon RX 6650 XT produces a highly resolution-sensitive experience in Microsoft Flight Simulator, with the measured frame rates showing a clear transition from CPU-bound behavior at 1080p to GPU-bound behavior at 4K. Across the full resolution sweep, the combo averages between 33.5 FPS at 4K Ultra and 102.3 FPS at 1080p Low, placing it at rank 1123 out of 1795 tested combinations. The data indicates this pairing is best suited for 1080p or 1440p flight simulation, with 4K requiring significant visual compromises to remain playable.

Resolution Scaling

The FPS drop from 1080p to 4K is substantial across all settings, but the magnitude varies dramatically depending on the preset. At Low settings, the transition from 1920x1080 (102.3 FPS) to 3840x2160 (61 FPS) represents a 40.4% reduction in frame rate. At Medium settings, the drop is from 85 FPS at 1080p to 49.2 FPS at 4K, a 42.1% decline. High settings show a steeper curve: 59.6 FPS at 1080p falls to 47 FPS at 1440p and then to 39.1 FPS at 4K, a cumulative 34.4% loss from the 1080p baseline. Ultra settings exhibit the most severe scaling, with 60 FPS at 1080p dropping to 47.1 FPS at 1440p and finally to 33.5 FPS at 4K — a 44.2% total reduction.

The pattern reveals that at 1080p, the processor is the primary limiting factor. Between 1080p and 1440p, the frame rate drops are moderate (7.6 FPS on High, 16.8 FPS on Medium, and 16.5 FPS on Low), suggesting the GPU begins to take over the workload as pixel count rises. However, the largest single resolution step occurs between 1440p and 4K, where the RX 6650 XT's 8 GB of GDDR6 memory and 128-bit bus (280.3 GB/s bandwidth) become the bottleneck. The 4K Low result of 61 FPS versus the 1080p Low result of 102.3 FPS indicates that even at minimal graphical load, the 4K pixel count overwhelms the GPU's shading throughput.

The scaling behavior also shows diminishing returns when lowering settings at 4K. Going from Ultra to High at 4K improves FPS by 5.6 (33.5 to 39.1), while going from High to Medium adds 10.1 FPS (39.1 to 49.2), and Medium to Low adds another 11.8 FPS (49.2 to 61). This suggests that at 4K, each tier of settings reduction yields meaningful gains, unlike at 1080p where the CPU limits total throughput regardless of preset.

CPU Role

The Intel Core i5-9400 is a 6-core, 6-thread Coffee Lake processor with a base clock of 2.90 GHz and a boost clock of 4.10 GHz. Its benchmark profile shows a Cinebench R23 multi-core score of 7969 and a single-core score of 1125, placing it at the 50th percentile among all CPUs. In Microsoft Flight Simulator, which relies heavily on single-thread performance for flight physics and scenery loading, the 4.10 GHz boost clock proves sufficient for maintaining playable frame rates at 1080p and 1440p, but the lack of hyper-threading (6 threads total) limits headroom when the game's background tasks compete for resources.

The CPU's nearest rivals in aggregate benchmark scores are all within 0.6% of its 2305 average: the Intel Core i3-10305 (2300, +0.2%), Intel Core i3-1125G4 (2299, +0.2%), Intel Xeon E-2134 (2295, +0.4%), and Intel Core i7-8809G (2319, -0.6%). This tight clustering indicates that the i5-9400's compute capability is not exceptional for its generation, yet its 9 MB shared L3 cache and dual-channel DDR4 memory interface (42.7 GB/s bandwidth) provide adequate data flow for the Radeon GPU.

The measured FPS data shows that at 1080p Low, the combo achieves 102.3 FPS, which is close to what the GPU can deliver when unconstrained. However, the fact that 1080p Ultra (60 FPS) and 1080p High (59.6 FPS) produce nearly identical results suggests the CPU saturates before the GPU becomes the limiting factor. The 6-core, 6-thread configuration without SMT means that when Microsoft Flight Simulator spawns additional simulation threads (AI traffic, weather, and scenery streaming), the processor cannot maintain the same frame pacing as at lower settings. The 50th percentile ranking reinforces that this CPU is mid-pack — adequate for 60 FPS in most scenarios, but not capable of pushing beyond that threshold at higher presets.

FAQ

Q: What is the best resolution to use with this combo for a consistent 60+ FPS experience?

A: At 1080p, the combo exceeds 60 FPS on Medium (85 FPS), High (59.6 FPS is just below), and Low (102.3 FPS). At 1440p, only the Low preset achieves 85.8 FPS; Medium (68.1 FPS) also stays above 60, but High (47 FPS) and Ultra (47.1 FPS) fall short. The 4K resolution only reaches 61 FPS on Low, with all other presets below 50 FPS.

Q: How does the RX 6650 XT compare to its nearest GPU rivals in aggregate benchmarks?

A: The GPU's average benchmark score of 29024 places it at the 72nd percentile. Its nearest rivals include the AMD Radeon RX 6800M (29011, 0% delta), AMD Radeon RX 470 (28996, +0.1%), Intel Arc A370M (29175, -0.5%), and AMD Radeon RX Vega M GH (29197, -0.6%). All rivals are within 0.6% of the RX 6650 XT's score, indicating near-identical compute performance in synthetic tests.

Q: Does this combo rank well for Microsoft Flight Simulator?

A: The combo ranks 1123 out of 1795 tested combinations, placing it in the 37th percentile of tested combos. This is below the GPU's individual 72nd percentile ranking and the CPU's 50th percentile, suggesting the pairing underperforms relative to what each component achieves alone. The gap indicates that the CPU's single-thread limitations and the GPU's 4K bandwidth constraints combine to reduce overall efficiency.

Q: Is the 4K performance playable at any settings?

A: The only 4K preset that achieves an average above 60 FPS is Low settings at 61 FPS. Medium (49.2 FPS) and High (39.1 FPS) are below the 60 FPS threshold, and Ultra (33.5 FPS) is marginal for flight simulation, which is typically more forgiving of lower frame rates than fast-paced genres. However, 4K Ultra at 33.5 FPS may still be acceptable for non-competitive flying.

Q: How much FPS is gained by dropping from Ultra to Low at each resolution?

A: At 1080p, the gain is 42.3 FPS (60 to 102.3). At 1440p, the gain is 38.7 FPS (47.1 to 85.8). At 4K, the gain is 27.5 FPS (33.5 to 61). The diminishing gains at higher resolutions confirm that the GPU becomes the limiting factor as pixel count increases, reducing the CPU's influence on the final frame rate.

Q: What does the 1080p High vs 1080p Ultra comparison tell about CPU headroom?

A: The frame rates are nearly identical: 59.6 FPS on High versus 60 FPS on Ultra. This 0.4 FPS difference is within measurement noise and indicates that the i5-9400 cannot feed the GPU faster than roughly 60 FPS at this resolution, regardless of the graphical preset. The CPU's 6-thread configuration and 2.90 GHz base clock cap performance before the GPU's 10.79 TFLOPS of FP32 compute is fully utilized.

Settings Recommendations

Based on the measured rows, the optimal experience depends heavily on the display resolution. For 1080p displays, the Medium preset at 85 FPS offers the best combination of visual fidelity and frame rate headroom, while High (59.6 FPS) is acceptable for users who prioritize image quality over smoothness. Ultra at 1080p (60 FPS) provides no meaningful FPS advantage over High, so the extra visual detail is essentially free — the CPU is the bottleneck in both cases. Users with 1080p panels should choose Ultra if they want maximum fidelity, as the frame rate cost is negligible.

For 1440p, the Medium preset (68.1 FPS) is the only setting that comfortably exceeds 60 FPS while maintaining moderate visual quality. High (47 FPS) and Ultra (47.1 FPS) are nearly identical in performance, suggesting that at these presets the GPU's memory bandwidth (280.3 GB/s) becomes the limiting factor, and the additional shading load from Ultra does not significantly impact throughput. Users targeting 60 FPS at 1440p should select Medium; those willing to accept 47 FPS can use either High or Ultra without meaningful difference.

At 4K, the Low preset (61 FPS) is the only option that achieves a playable average, but it sacrifices most of the visual features that make Microsoft Flight Simulator immersive. Medium (49.2 FPS) is a viable compromise for users who prioritize scenery detail over frame smoothness, while High (39.1 FPS) and Ultra (33.5 FPS) are best reserved for screenshot capture or slow, scenic flights where frame rate consistency matters less. The 4K data suggests that this combo should be used at 1080p or 1440p for the best overall experience.

How This Combo Ranks

The Intel Core i5-9400 + AMD Radeon RX 6650 XT combination ranks 1123 out of 1795 tested combos in Microsoft Flight Simulator, placing it in the lower-middle tier of tested systems. This rank is notably lower than what the GPU's individual percentile (72nd) might suggest, and also below the CPU's 50th percentile. The discrepancy highlights a fundamental mismatch: the RX 6650 XT's 8 GB GDDR6 memory and 128-bit bus are well-suited for 1080p and 1440p gaming, but the i5-9400's 6-thread CPU cannot consistently feed the GPU at high frame rates in this simulation-heavy title.

The combo's rank relative to other tested configurations indicates that many systems with weaker GPUs but stronger CPUs achieve better results in Microsoft Flight Simulator, because the game's CPU-bound nature at lower resolutions rewards single-thread performance. The i5-9400's Cinebench R23 single-core score of 1125 and its 50th percentile overall ranking place it squarely in the middle of the pack, meaning that users upgrading from this combo would see the largest gains from a newer CPU with higher boost clocks and more threads. The RX 6650 XT's 72nd percentile GPU ranking shows that the graphics card is not the primary bottleneck at 1080p, where the CPU caps performance at around 60 FPS on High/Ultra presets. For users considering this combo, the data suggests it is adequate for 1080p and playable at 1440p Medium, but it will not deliver high refresh rates or 4K performance in Microsoft Flight Simulator.