Microsoft Flight Simulator

# Microsoft Flight Simulator: Intel Core i5-9400 + AMD Radeon RX 7900 XT

This combination pairs a six-core Coffee Lake processor from 2018 with AMD's flagship RDNA 3 graphics card, producing a benchmark profile that clearly illustrates where Flight Simulator's bottlenecks reside. The measured frame rates across resolutions and settings reveal a system that scales predictably with GPU load, yet shows distinct signs of CPU limitation at lower resolutions and higher settings. The data shows a 488th place finish out of 1,795 tested combos, placing this pairing in the upper quartile of all configurations tested for this title.

Resolution Scaling

The frame rate progression from 1080p to 4K tells a clear story about component balance. At 1080p High settings, the combo delivers 106.7 FPS, which drops to 84.3 FPS at 1440p, and further to 57.6 FPS at 4K—a total reduction of 46% from the lowest to highest resolution tested. This scaling pattern suggests that the GPU becomes progressively more dominant as resolution increases, but the CPU still has enough headroom to keep frame rates respectable even at 4K.

Looking at the Low settings preset, the resolution scaling is compressed: 129.9 FPS at 1080p, 116.6 FPS at 1440p, and 103.6 FPS at 4K. The 20% drop from 1080p to 4K at Low settings is far smaller than the 46% drop at High settings, indicating that the GPU is not the primary constraint when visual load is minimized. The CPU, with its six cores and six threads running at a base clock of 2.90 GHz and boost of 4.10 GHz, appears to be the limiting factor at Low settings across all resolutions, as the RX 7900 XT has ample headroom to render scenes quickly.

At Medium settings, the progression from 116 FPS at 1080p to 107.6 FPS at 1440p and 78.1 FPS at 4K shows a more balanced scaling curve. The Ultra preset yields 99.9 FPS at 1080p, 77.2 FPS at 1440p, and 58.8 FPS at 4K. Interestingly, the Ultra 4K result (58.8 FPS) is nearly identical to the High 4K result (57.6 FPS), suggesting that beyond a certain visual quality threshold, the GPU's workload saturates and additional settings have diminishing returns. The 4K Ultra frame rate sits just above the 60 FPS target, while 4K High falls slightly below, making the Medium preset at 4K (78.1 FPS) the practical sweet spot for smooth gameplay.

CPU Role

The Intel Core i5-9400 brings six physical cores without hyper-threading, meaning six threads total. This configuration is notable for Flight Simulator, which historically benefits from higher single-thread performance due to its simulation-heavy workload. The processor's boost clock of 4.10 GHz provides reasonable single-core throughput, reflected in its Cinebench R23 single-core score of 1,125 points. The multi-core score of 7,969 in the same test indicates that the CPU can handle parallel tasks, but the lack of additional threads may become a factor in complex scenes with heavy AI traffic or detailed scenery.

The CPU's average benchmark score of 2,305 places it at the 50th percentile among all tested CPUs, squarely in the mid-range. Its nearest rivals illustrate its positioning: the Intel Core i3-10305 scores 2,300 (0.2% behind), the Intel Core i3-1125G4 scores 2,299 (0.2% behind), and the Intel Xeon E-2134 scores 2,295 (0.4% behind). Only the Intel Core i7-8809G surpasses it among listed rivals, with a score of 2,319 (0.6% ahead). This tight clustering around the 2,300-point mark suggests that the i5-9400 is performing exactly as expected for its generation and price point.

In the context of Flight Simulator, the CPU's role is most evident in the Low settings results. At 1080p Low, the system hits 129.9 FPS, but this is the ceiling across all Low settings tests—the 1440p and 4K results (116.6 and 103.6 FPS respectively) are still high, but the gap between 1080p and 4K is only 20%, indicating that the CPU is not fully taxed even at lower resolutions. The L3 cache of 9 MB (shared) and dual-channel DDR4 memory support with 42.7 GB/s bandwidth provide adequate data flow for the simulation's asset streaming, though the PCIe Gen 3 interface with 16 lanes may slightly limit GPU communication compared to newer platforms.

How This Combo Ranks

With a combo rank of 488 out of 1,795 tested configurations, this pairing sits in the top 27% of all combinations tested for Microsoft Flight Simulator. This ranking reflects a balanced system that can handle the game's demands at high settings across most resolutions, but it is not among the elite configurations that dominate the leaderboard. The RX 7900 XT's GPU percentile of 82 (82nd percentile among all GPUs) is significantly higher than the CPU's 50th percentile, indicating that the processor is the weaker link in this pairing.

The GPU's average benchmark score of 38,358 places it near the NVIDIA GeForce RTX 5080 Mobile (38,349, 0% delta), the NVIDIA CMP 70HX (38,225, 0.3% ahead), and the NVIDIA GeForce RTX 4080 Mobile (38,135, 0.6% ahead). The NVIDIA GeForce MX570 shows a slightly higher score of 38,494 (-0.4% delta), though this likely reflects synthetic benchmark characteristics rather than real-world gaming performance. The RX 7900 XT's PassMark G3D score of 29,009 and 3DMark Steel Nomad DX12 score of 5,623 reinforce its position as a high-end graphics card.

The combination's ranking suggests that the i5-9400, while not a bottleneck at 4K Ultra (58.8 FPS), does prevent the system from fully utilizing the GPU's capabilities at lower resolutions. The 1080p Ultra result of 99.9 FPS is respectable but falls short of what the RX 7900 XT could deliver with a stronger CPU. The rank of 488 out of 1,795 indicates that there are 487 configurations that achieve better overall performance in this game, which is a meaningful gap given the GPU's high-end positioning.

FAQ

Q: Is the Intel Core i5-9400 adequate for Microsoft Flight Simulator at 4K?

A: Yes, but with caveats. At 4K High settings, the combo delivers 57.6 FPS, which is playable but below the 60 FPS threshold. At 4K Medium, it reaches 78.1 FPS, and at 4K Low, it hits 103.6 FPS. The Ultra preset yields 58.8 FPS, showing that the CPU can support 4K gaming, though not at maximum settings with a comfortable margin.

Q: How does the RX 7900 XT perform relative to its nearest rivals in synthetic benchmarks?

A: The RX 7900 XT's average benchmark score of 38,358 is essentially tied with the NVIDIA GeForce RTX 5080 Mobile (38,349, 0% delta) and 0.3% ahead of the NVIDIA CMP 70HX (38,225). It trails the NVIDIA GeForce MX570 by 0.4% (38,494 vs. 38,358) and is 0.6% ahead of the NVIDIA GeForce RTX 4080 Mobile (38,135).

Q: What is the CPU's percentile ranking among all tested processors?

A: The Intel Core i5-9400 sits at the 50th percentile among all CPUs tested, with an average benchmark score of 2,305. Its nearest rival, the Intel Core i3-10305, scores 2,300 (0.2% behind), while the Intel Core i7-8809G scores 2,319 (0.6% ahead).

Q: Which resolution and settings combination offers the best frame rate stability?

A: At 1080p Low, the system achieves 129.9 FPS, which is the highest measured result. For a balance of visual quality and performance, 1440p Medium at 107.6 FPS or 4K Medium at 78.1 FPS provide strong frame rates while maintaining reasonable visual fidelity.

Q: Does the system maintain above 60 FPS at 4K across all settings?

A: No. At 4K High, the average is 57.6 FPS, and at 4K Ultra, it is 58.8 FPS—both below 60 FPS. However, 4K Medium (78.1 FPS) and 4K Low (103.6 FPS) both exceed 60 FPS comfortably.

Q: How does the combo's rank in this game compare to other tested configurations?

A: The combination ranks 488th out of 1,795 tested combos, placing it in the top 27% of all configurations. This indicates solid performance, but the CPU's 50th percentile ranking versus the GPU's 82nd percentile shows the processor is the more limiting component.

GPU Role

The AMD Radeon RX 7900 XT is the dominant component in this pairing, with specs that explain its high-end positioning. Built on the Navi 31 chip with RDNA 3.0 architecture and a 5 nm process from TSMC, the GPU packs 57,700 million transistors on a 529 mm² die. Its 20 GB of GDDR6 memory on a 320-bit bus delivers 800.0 GB/s of bandwidth, which is crucial for Flight Simulator's texture streaming and large world data. The boost clock of 2394 MHz and game clock of 2025 MHz allow the 5,376 shading units, 336 TMUs, and 192 ROPs to process geometry and effects efficiently.

The GPU's compute capabilities are substantial: 51.48 TFLOPS of FP32 performance and 103.0 TFLOPS of FP16 (2:1 ratio). The 84 ray tracing cores support the game's advanced lighting effects, though Flight Simulator's primary load is rasterization and simulation data processing. The pixel rate of 459.6 GPixel/s and texture rate of 804.4 GTexel/s indicate that the GPU can handle high-resolution rendering without becoming the primary bottleneck—indeed, the 4K Ultra result of 58.8 FPS demonstrates that even at maximum settings, the GPU delivers near-60 FPS performance.

In terms of synthetic benchmarks, the RX 7900 XT's PassMark G3D score of 29,009 and 3DMark Steel Nomad DX12 score of 5,623 place it in the 82nd percentile among all GPUs. Its nearest rivals in average score include the NVIDIA GeForce RTX 5080 Mobile (38,349, 0% delta) and the NVIDIA CMP 70HX (38,225, 0.3% ahead), showing that the GPU is competitive with top-tier mobile and workstation cards. The Geekbench OpenCL score of 169,834 and Vulkan score of 160,119 further confirm its strong compute performance.

The GPU's role in this combo is best illustrated by the scaling from 1080p to 4K at High settings: 106.7 FPS to 57.6 FPS, a 46% reduction. This indicates that as resolution increases, the GPU becomes more heavily utilized, which is expected behavior for a high-end card paired with a mid-range CPU. The fact that 4K Ultra (58.8 FPS) is only slightly higher than 4K High (57.6 FPS) suggests that the GPU is nearing its performance ceiling at this resolution, and additional settings have minimal impact. However, at 1080p Low (129.9 FPS) versus 4K Low (103.6 FPS), the GPU still has headroom, implying that the CPU is the limiting factor at lower resolutions and settings. Ultimately, the RX 7900 XT provides enough performance to make this combo viable for high-resolution Flight Simulator play, but the i5-9400's six-thread limitation prevents the system from reaching the frame rates the GPU could achieve with a more capable processor.