Microsoft Flight Simulator

# Microsoft Flight Simulator with Intel Core i5-9400 + NVIDIA GeForce RTX 3070

The pairing of a 6-core Intel Core i5-9400 with an RTX 3070 produces a wide FPS spread across resolutions and presets, indicating a system where the GPU becomes progressively more dominant as resolution climbs. At 1080p Low, the combo reaches 128.3 FPS, but at 4K Ultra it drops to 46.2 FPS — a 63.9% reduction that clearly shows the RTX 3070 being pushed to its limits while the i5-9400 has enough headroom to avoid becoming the primary bottleneck at higher settings.

Resolution Scaling

The measured data reveals a predictable yet steep scaling curve. Moving from 1920x1080 to 2560x1440 at High settings, the average FPS falls from 76.7 to 65.8, a 14.2% performance loss. The jump from 1440p to 3840x2160 at High is more severe, dropping from 65.8 to 46.9 FPS — a 28.7% reduction. This pattern intensifies at Ultra settings: 1080p yields 77.8 FPS, 1440p drops to 58.5 FPS, and 4K collapses to 46.2 FPS. The scaling from 1080p to 4K at Ultra represents a 40.6% performance loss overall.

Low settings show the most dramatic resolution scaling because the CPU has more relative influence. At 1080p Low, the combo produces 128.3 FPS, which falls to 110.1 at 1440p and 78 at 4K. The 4K Low result is 39.2% lower than 1080p Low, suggesting that even at the lowest graphical preset, the RTX 3070's memory bandwidth and compute resources are being saturated by the higher pixel count. Interestingly, the gap between 1080p and 1440p Low is only 14.2%, while the 1440p to 4K gap is 29.2%, indicating that the GPU's 8 GB GDDR6 buffer and 448.0 GB/s bandwidth start to strain beyond 1440p.

The data suggests that at 1080p, the i5-9400 with its 6 cores and 4.10 GHz boost clock is more of a limiting factor, particularly at Low settings where the GPU has spare capacity. At 4K, the RTX 3070's 5888 shading units and 96 ROPs become the clear constraint, with the CPU's role diminishing. For users targeting 4K, the difference between Medium (59.2 FPS) and Ultra (46.2 FPS) is only 13 FPS, meaning the GPU is already near its ceiling regardless of preset.

Settings Recommendations

For 4K displays, the data points toward Medium settings as the sweet spot. The 59.2 FPS average at 3840x2160 Medium is 26.1% higher than High's 46.9 FPS and 28.1% higher than Ultra's 46.2 FPS, while still delivering significantly better visual fidelity than Low's 78 FPS. The gap between High and Ultra at 4K is negligible — just 0.7 FPS — so there is no reason to select Ultra over High unless every visual detail matters more than smoothness. Medium at 4K offers the best balance between playability and quality, staying above 55 FPS while avoiding the steep drop to the mid-40s.

At 1440p, High settings are the recommended choice. The 65.8 FPS average is above the 60 FPS threshold for smooth flight simulation, and it is only 3.7 FPS lower than Medium's 81.7 FPS in terms of visual impact. Ultra at 1440p drops to 58.5 FPS, which is borderline for a game like this where panning across terrain can expose frame pacing issues. For 1080p users, High at 76.7 FPS is solid, but Medium at 103.7 FPS provides a much larger margin for complex scenes with dense cloud layers or cityscapes, making it the better choice for consistent performance.

The Low presets should be avoided unless the user prioritizes maximum frame rates above all else. At 1080p Low, the 128.3 FPS result is impressive, but the visual downgrade in a simulation game like this — where terrain detail and cockpit readability matter — is not worth the extra 24.6 FPS over Medium. The data shows diminishing returns beyond Medium at every resolution, with Ultra offering only marginal FPS improvements over High in most cases.

FAQ

Q: Can this combo handle 4K gaming in Microsoft Flight Simulator?

A: Yes, but with compromises. At 4K Medium, the average FPS is 59.2, which is playable. At 4K High, it drops to 46.9 FPS, and at Ultra it falls to 46.2 FPS. For smooth 4K, stick to Medium settings.

Q: Is the Intel Core i5-9400 a bottleneck for the RTX 3070?

A: At 1080p Low, the combination produces 128.3 FPS, which suggests the CPU is keeping pace. However, the i5-9400 has only 6 cores and 6 threads, and its 2.90 GHz base clock with 4.10 GHz boost may limit performance in CPU-heavy scenes. At higher resolutions, the GPU becomes the limiting factor.

Q: What is the best resolution for this combo?

A: 2560x1440 at High settings delivers 65.8 FPS, which is the best balance of visual quality and smoothness. At 1080p, the combo can exceed 100 FPS on Medium, but 1440p High is the sweet spot for a flight simulator.

Q: How much FPS do you lose going from 1080p to 4K at the same settings?

A: At Low settings, the drop is from 128.3 to 78 FPS, a 39.2% loss. At High settings, it falls from 76.7 to 46.9 FPS, a 38.9% loss. At Ultra, the drop is from 77.8 to 46.2 FPS, a 40.6% loss.

Q: Should I use Ultra settings with this hardware?

A: The data shows Ultra provides almost no benefit over High. At 1080p, Ultra averages 77.8 FPS versus 76.7 for High — a mere 1.1 FPS difference. At 4K, Ultra (46.2 FPS) is actually slower than High (46.9 FPS). Ultra is not worth the performance cost.

Q: How does this combo rank compared to other tested systems?

A: This combination ranks 832nd out of 1795 tested combos, placing it in the upper-middle tier. The RTX 3070 sits at the 72nd percentile among all GPUs, while the i5-9400 is at the 50th percentile among CPUs, matching the combo's mid-range positioning.

Measured FPS Breakdown

At 1920x1080, the combo delivers its highest raw performance. Low settings produce an average of 128.3 FPS, which is 23.7% faster than Medium's 103.7 FPS. Medium to High drops performance by 26.1%, falling to 76.7 FPS. Interestingly, Ultra at 77.8 FPS is slightly faster than High, a 1.4% improvement that suggests High and Ultra are nearly identical in GPU load at this resolution. The 1080p results show that the RTX 3070 has substantial headroom even with the i5-9400's 6 threads, as the CPU can feed the GPU enough data to exceed 100 FPS on Medium.

At 2560x1440, the performance curve steepens. Low settings average 110.1 FPS, which is 14.2% lower than 1080p Low. Medium produces 81.7 FPS, a 25.8% drop from Low. High falls to 65.8 FPS, a 19.5% reduction from Medium. Ultra bottoms out at 58.5 FPS, which is 11.1% lower than High. The 1440p data reveals a consistent pattern: each preset step costs roughly 15-25% performance, with the gap between Medium and High being the largest single jump.

At 3840x2160, the RTX 3070 is clearly working hard. Low settings average 78 FPS, which is 29.2% lower than 1440p Low. Medium drops to 59.2 FPS, a 24.1% reduction from Low. High falls to 46.9 FPS, a 20.8% decrease from Medium. Ultra produces 46.2 FPS, only 1.5% slower than High. The 4K numbers show that Low to Medium is the biggest single step (24.1%), while High to Ultra is nearly indistinguishable, confirming that High and Ultra stress the GPU similarly at this resolution.

How This Combo Ranks

With a rank of 832 out of 1795 tested combinations, this system sits near the 46th percentile of all tested combos. This positioning makes sense given the hardware: the RTX 3070 ranks at the 72nd percentile among all GPUs, while the i5-9400 sits at the 50th percentile among CPUs. The combo's overall rank is dragged down by the CPU, which is a mid-pack performer with an average benchmark score of 2305. The GPU's average benchmark score of 28238 is strong, but the 6-core, 6-thread i5-9400 limits the system's ceiling in CPU-bound scenarios.

The nearest CPU rivals show how tightly clustered the i5-9400 is in performance. The Intel Core i3-10305 scores 2300, just 0.2% lower, while the Intel Core i3-1125G4 also scores 2299, a 0.2% delta. The Intel Xeon E-2134 trails by 0.4% at 2295, and the Intel Core i7-8809G leads by 0.6% at 2319. This indicates the i5-9400 is squarely in the middle of its performance tier, with no meaningful advantage over cheaper alternatives. For the GPU, the nearest rivals include the AMD FirePro S7150 at 28409 (0.6% higher), the AMD Radeon RX 6600 XT at 27985 (0.9% lower), and the NVIDIA GeForce GTX 980 Ti at 27956 (1% lower). The RTX 3070's performance is competitive with these cards, but the 8 GB VRAM and Ampere architecture give it advantages in modern titles.

CPU Role

The Intel Core i5-9400 is a 6-core, 6-thread processor based on the Coffee Lake architecture, manufactured on Intel's 14 nm process. Its base clock is 2.90 GHz with a boost clock of 4.10 GHz, and it has 9 MB of shared L3 cache. The CPU's benchmark scores show a clear split: multi-core performance is moderate (7969 in Cinebench R23 multicore), while single-core is respectable (1125 in Cinebench R23 singlecore). The 50th percentile ranking among all CPUs confirms it is an average performer by modern standards.

In Microsoft Flight Simulator, the CPU's role varies by resolution and settings. At 1080p Low, the combo hits 128.3 FPS, which indicates the i5-9400 can feed the RTX 3070 enough data to avoid severe bottlenecking. However, the 6-thread limit means that complex scenes with heavy AI traffic or detailed scenery could cause frame drops, as the CPU lacks the multi-threading headroom of higher-end parts. The 65 W TDP and dual-channel DDR4 memory support with 42.7 GB/s bandwidth are adequate but not exceptional.

At 4K, the CPU becomes less relevant. The RTX 3070's 8 GB GDDR6 memory and 448.0 GB/s bandwidth are the main constraints, as evidenced by the small gap between High and Ultra at 4K (0.7 FPS). The i5-9400's performance relative to rivals — within 0.6% of the nearest competitors — means upgrading the CPU would yield minimal gains in this game at higher resolutions. The data suggests the i5-9400 is sufficient for this GPU pairing, with the bottleneck shifting to the GPU as resolution increases. For users who play at 1080p with low settings, a CPU upgrade would help, but for 1440p or 4K, the RTX 3070 is the limiting factor.