Microsoft Flight Simulator

The AMD Ryzen 5 8400F and AMD Radeon RX 9070 combination delivers a robust flight simulation experience, with performance scaling that clearly illustrates the shifting balance between CPU and GPU load as resolution increases. Measured results show this pairing is capable of high refresh rates at 1080p and remains playable at 4K, though the frame rate curve reveals where each component’s influence peaks.

Resolution Scaling

The frame rate progression from 1080p to 4K follows a predictable pattern of GPU-bound scaling, but the magnitude of the drop tells a specific story about this pairing. At Low settings, the average frame rate falls from 153.2 FPS at 1920x1080 to 121.7 FPS at 2560x1440, and then to 90.8 FPS at 3840x2160. This represents a 40.7% reduction from 1080p to 4K, indicating that even at the lowest graphical preset, the RX 9070 is still the primary bottleneck at higher resolutions. The CPU, with its 6 cores and 12 threads based on Zen 4 architecture, has sufficient headroom to feed the GPU at 4K Low, as evidenced by the still-substantial 90.8 FPS figure.

The scaling behavior changes character when moving to heavier settings. At High settings, the frame rate drops from 92.4 FPS at 1080p to 73.5 FPS at 1440p, then to 52.8 FPS at 4K. The 42.9% decline from 1080p to 4K is slightly steeper than at Low, which is expected as the GPU’s shading units and texture units handle more work. However, the Ultra preset shows a different pattern: 87 FPS at 1080p, 70.9 FPS at 1440p, and 47.6 FPS at 4K. The 1080p Ultra result is notably close to the 1080p High result (87 vs 92.4), suggesting that at 1080p, the CPU begins to limit performance even with the GPU working harder.

This is the classic signature of a balanced mid-range pairing. At 1080p with High or Ultra settings, the Ryzen 5 8400F’s single-thread performance (evidenced by 3dmark_single_thread score of 951 and Cinebench R23 single-core score of 2943) becomes a more significant factor, capping the frame rate. At 4K, the GPU’s rendering load dominates, and the CPU’s role diminishes. The data shows that the RX 9070’s 16 GB of GDDR6 memory on a 256-bit bus with 644.6 GB/s bandwidth is not a limiting factor even at 4K Ultra, as the frame rate remains above 47 FPS. The combo achieves 47.6 FPS at 4K Ultra, which is a playable threshold for a flight simulator where smoothness matters more than twitch-response.

FAQ

Q: How does the combo perform at 4K Ultra settings?

A: The measured average frame rate is 47.6 FPS at 3840x2160 with Ultra settings. This is the lowest result across all tested configurations but remains within a playable range for a flight simulator, where the pace is slower and frame pacing is less critical than in competitive shooters.

Q: What is the best resolution for high refresh rate monitors?

A: At 1920x1080 with Low settings, the combo achieves 153.2 FPS, which is the highest recorded frame rate. For those with 144Hz monitors, 1440p Low (121.7 FPS) or 1080p Medium (118.4 FPS) also provide ample headroom above the refresh rate threshold.

Q: Is the CPU or GPU the limiting factor at 1080p?

A: The data indicates a CPU limitation at 1080p with higher presets. The difference between High (92.4 FPS) and Ultra (87 FPS) at 1080p is only 5.4 FPS, whereas at 4K the difference between High (52.8 FPS) and Ultra (47.6 FPS) is also 5.2 FPS. The relatively small gap at 1080p suggests the Ryzen 5 8400F’s single-thread performance, which scores 2943 in Cinebench R23, caps the frame rate before the GPU can fully stretch.

Q: How does this combo rank among all tested configurations?

A: The combo ranks 590th out of 1795 tested combinations, placing it in the 67th percentile of all tested pairings. This is a solid mid-to-upper tier result, indicating that this pairing offers consistent performance without being a top-tier enthusiast configuration.

Q: What is the frame rate drop from 1080p to 4K at Medium settings?

A: The average frame rate falls from 118.4 FPS at 1920x1080 to 97.3 FPS at 2560x1440, and then to 70.3 FPS at 3840x2160. This represents a 40.6% reduction from 1080p to 4K, showing that the RX 9070’s rendering pipeline is the dominant factor at this preset.

Q: Does the 16 GB VRAM capacity affect 4K performance?

A: The measured results show no evidence of VRAM capacity limiting 4K performance. The RX 9070’s 16 GB of GDDR6 memory with 644.6 GB/s bandwidth is sufficient for the Ultra preset at 3840x2160, as the frame rate drops steadily with increasing settings rather than exhibiting a cliff-like degradation that would indicate memory saturation.

GPU Role

The Radeon RX 9070’s specifications explain its behavior in this flight simulator. The GPU features a base clock of 1330 MHz and a boost clock of 2520 MHz, with a game clock of 2070 MHz. These clocks, combined with 3584 shading units and 128 ROPs, drive the pixel rate of 322.6 GPixel/s and texture rate of 564.5 GTexel/s. The FP32 performance of 36.13 TFLOPS provides the raw compute throughput needed for the complex terrain rendering and weather effects in Microsoft Flight Simulator.

The memory subsystem is a key strength for 4K performance. The 16 GB VRAM capacity, paired with a 256-bit bus and 644.6 GB/s bandwidth, ensures that texture streaming at Ultra settings does not become a bottleneck. The measured frame rates support this: at 4K, the difference between Medium (70.3 FPS) and Ultra (47.6 FPS) is a 32.3% drop, which aligns with the increased shading and texture work rather than any memory-related stall. The GPU’s RDNA 4.0 architecture, built on TSMC’s 4 nm process with 53,900 million transistors, delivers efficiency that allows the card to maintain boost clocks under sustained load in a flight sim scenario.

The GPU’s benchmark scores corroborate its position in this pairing. A Passmark G3D score of 25381 and a 3DMark Steel Nomad DX12 score of 6290 place the RX 9070 in the 79th percentile of all GPUs. This is a high-performing card, but its nearest rivals in the benchmark database—the NVIDIA A2 (deltaPct -0.2), NVIDIA Quadro GV100 (deltaPct 0.3), and AMD Radeon HD 7970 (deltaPct 0.7)—are not direct gaming comparisons, indicating that the RX 9070 occupies a unique performance tier. The GPU’s 56 RT cores are present, though flight simulators do not heavily utilize ray tracing in the same manner as modern action titles.

Settings Recommendations

The measured data provides clear guidance for optimizing the experience on this combo. For players prioritizing smoothness over visual fidelity, the Low preset at 2560x1440 offers 121.7 FPS, which is an excellent choice for high-refresh-rate displays. The jump from Low to Medium at 1440p costs 24.4 FPS (from 121.7 to 97.3), but the visual improvement in a flight simulator—where terrain detail and cockpit readability matter—is often worth the trade. At 1440p Medium, the 97.3 FPS result remains comfortably above 60 FPS, making it the recommended balance for most users.

For 4K displays, the Medium preset at 70.3 FPS is the sweet spot. This provides smooth motion while maintaining acceptable visual quality. The High preset at 4K drops to 52.8 FPS, which is still playable but may introduce slight stutter during rapid camera panning over dense scenery. The Ultra preset at 47.6 FPS is the most demanding setting, and while it is the lowest measured result, it remains within the range that many flight sim enthusiasts tolerate for maximum visual immersion. At 1080p, the High preset at 92.4 FPS is the best recommendation, as the Ultra preset’s 87 FPS result shows diminishing returns—the 5.4 FPS gain from Ultra to High is not worth the visual downgrade for most users, but the CPU limitation at this resolution means that High is the most efficient choice.

How This Combo Ranks

The combination of the AMD Ryzen 5 8400F and AMD Radeon RX 9070 ranks 590th out of 1795 tested combos in Microsoft Flight Simulator. This position in the 67th percentile of all configurations indicates a well-matched pairing that delivers consistent performance across the tested resolution and settings matrix. The CPU’s percentile ranking (82nd among all CPUs) and the GPU’s percentile ranking (79th among all GPUs) are closely aligned, which is a positive indicator for system balance.

The CPU’s nearest rivals in the broader benchmark database—the AMD Ryzen 7 2700X (deltaPct 0), AMD Ryzen AI 5 PRO 340 (deltaPct -0.1), and AMD EPYC 9474F (deltaPct -0.2)—all have nearly identical average scores, demonstrating that the 8400F’s performance is tightly clustered with these older or differently-purposed chips. The Ryzen 5 7500F (deltaPct 0.3) is the closest competitor, and the 8400F edges it out slightly. This CPU performance level, combined with the GPU’s distinct tier, produces a combo that handles the CPU-bound segments at 1080p and GPU-bound segments at 4K with equal competence. The 590th rank reflects a system that is not at the extreme high end but is far from entry-level, making it a capable choice for flight simulation at a variety of resolutions and quality settings.