Pc Building Simulator

The Intel Core i5-9400 paired with the AMD Radeon RX 6650 XT delivers a solid 1080p and 1440p experience in Pc Building Simulator, but the data clearly shows that 4K Ultra is beyond its comfort zone. This combination ranks in the 37th percentile of tested combos, indicating a balanced pairing where neither component is a severe bottleneck in most scenarios, but where the GPU becomes the primary limiting factor at higher resolutions.

Resolution Scaling

The measured FPS data reveals a steep performance drop as resolution increases, which is a classic indicator of GPU-bound behavior at 4K. At 1080p Ultra, the combo produces 111.7 FPS, which falls to 69.6 FPS at 1440p Ultra, a 37.7% reduction. Moving to 4K Ultra, the average FPS plummets to 39.2, representing a 64.9% decrease from the 1080p result. This scaling pattern is characteristic of a system where the GPU's rendering throughput, rather than the CPU's processing capability, determines the frame rate ceiling at higher pixel counts.

The story is similar when examining the Low settings preset. At 1080p Low, the system achieves 236.3 FPS, which drops to 147.5 FPS at 1440p (a 37.6% decrease) and then to 75.4 FPS at 4K (a 68.1% decrease from 1080p). The fact that 4K Low produces fewer frames than 1440p High (75.4 vs 74.9 FPS) is telling: the resolution increase from 1440p to 4K has roughly the same performance cost as moving from Low to High settings at 1440p. This suggests that pixel count is the dominant cost factor, confirming that the RX 6650 XT is the limiting component at 4K.

Conversely, the scaling from 1080p to 1440p at lower settings shows the CPU can keep up. The 147.5 FPS result at 1440p Low is still exceptionally high for a simulation game, indicating that the six-core i5-9400 has sufficient headroom at these frame rates. However, the data shows diminishing returns: the gap between 1440p and 4K widens at higher settings, reinforcing that the GPU's 8 GB VRAM and 128-bit memory interface are the bottlenecks for 4K workloads.

GPU Role

The AMD Radeon RX 6650 XT is built on the RDNA 2.0 architecture with a 7 nm process, featuring 2048 shading units and 64 ROPs. Its boost clock of 2635 MHz is high, and the 8 GB of GDDR6 memory on a 128-bit bus provides 280.3 GB/s of bandwidth. In Pc Building Simulator, this configuration proves adequate for 1080p and 1440p gaming, but the 4K results indicate the GPU's limits. The 39.2 FPS average at 4K Ultra is below the 60 FPS threshold that most users consider smooth, and even 4K Low at 75.4 FPS barely crosses that line.

The GPU's performance percentile of 72 versus all GPUs suggests it is a capable mid-range part. Its nearest rival, the AMD Radeon RX 6800M, has an identical average benchmark score (29011 vs 29024, a 0% delta), which means the RX 6650 XT is competitive with that mobile flagship in synthetic tests. However, in this game, the 4K data shows that the GPU's memory subsystem is stressed: the 40.2 FPS at 4K High versus 39.2 FPS at 4K Ultra (a 2.5% difference) indicates that Ultra settings are not meaningfully more demanding than High, suggesting the bottleneck shifts from shader work to memory bandwidth as pixel count rises.

The 10.79 TFLOPS FP32 compute rating is respectable, but it is not enough to overcome the pixel fill requirements at 3840x2160. The GPU's texture rate of 337.3 GTexel/s and pixel rate of 168.6 GPixel/s are the relevant metrics here; the data indicates that at 4K, these rates are insufficient to maintain high frame rates. The 72nd percentile ranking confirms this is an upper-mid-range card, and the measured FPS reflects that positioning.

CPU Role

The Intel Core i5-9400 is a six-core, six-thread processor from the Coffee Lake architecture, with a base clock of 2.90 GHz and a boost clock of 4.10 GHz. Its 9 MB of shared L3 cache and dual-channel DDR4 memory support (42.7 GB/s bandwidth) are typical for its generation. In Pc Building Simulator, the CPU's role appears secondary to the GPU at higher resolutions, but it is not idle. The 1080p Low result of 236.3 FPS is high enough that the CPU's single-thread performance becomes relevant, as simulation games often have a primary game thread.

The CPU's benchmark scores show a mixed picture. Its Cinebench R23 multi-core score of 7969 and single-core score of 1125 place it in the 50th percentile of all CPUs, meaning it is exactly average in the database. Its nearest rival, the Intel Core i3-10305, has an average score of 2300, just 0.2% lower than the i5-9400's 2305 average. This suggests that the i5-9400 is not a performance outlier; it is a competent mid-range chip that does not bottleneck the RX 6650 XT in this title.

The data supports this interpretation: the 147.5 FPS at 1440p Low and 116.2 FPS at 1080p High are frame rates that would expose CPU limitations if the processor were weak. The fact that the system can exceed 200 FPS at 1080p Low (236.3 FPS) indicates that the i5-9400's six cores are sufficient for this game's logic, which is not particularly demanding given the genre. However, the 50th percentile ranking means users should not expect this CPU to drive frame rates much higher in more CPU-intensive titles; in Pc Building Simulator, it is adequate.

Measured FPS Breakdown

At 1920x1080, the system delivers strong results across all settings. Low settings produce 236.3 FPS, Medium 167.6 FPS, High 116.2 FPS, and Ultra 111.7 FPS. The difference between High and Ultra is minimal (4.5 FPS, or 3.9%), suggesting that Ultra is not much more demanding than High at this resolution. This is the sweet spot for this combo, with all presets exceeding the 60 FPS threshold by a wide margin.

At 2560x1440, the frame rates remain playable but show the GPU's workload increasing. Low yields 147.5 FPS, Medium 106.8 FPS, High 74.9 FPS, and Ultra 69.6 FPS. The gap between High and Ultra narrows further (5.3 FPS difference), and all settings except Ultra stay above 70 FPS. A 1440p 144 Hz monitor would be well-served by the Low or Medium presets, while High and Ultra are better suited to 60 Hz panels.

At 3840x2160, the results are marginal. Low produces 75.4 FPS, Medium 54.9 FPS, High 40.2 FPS, and Ultra 39.2 FPS. Only Low is comfortably above 60 FPS, and Medium barely misses it. High and Ultra are below playable thresholds for most users. The 15.1 FPS drop from Low to Medium at 4K is the largest single-step reduction in the entire data set, indicating that Medium settings introduce a significant shader load that the RX 6650 XT cannot sustain at this resolution.

How This Combo Ranks

The combo ranks 1108 out of 1769 tested combinations, placing it in the 37.4th percentile (the 63rd percentile from the bottom). This means that roughly two-thirds of tested combos perform better in Pc Building Simulator. This is a modest ranking, reflecting that while the i5-9400 and RX 6650 XT are each mid-range parts, they are not top-tier for this game. The GPU's 72nd percentile ranking is higher than the CPU's 50th, but the combo's overall position suggests that the pairing is well-balanced rather than optimized for peak performance.

Comparing to rivals, the RX 6650 XT's nearest competitor, the AMD Radeon RX 6800M, has a 0% delta in average benchmark score, meaning the two GPUs are statistically tied in synthetic tests. However, the RX 6800M is a laptop GPU, so its performance in a desktop context may differ. The CPU's nearest rival, the Intel Core i3-10305, is 0.2% slower, and the Intel Core i7-8809G is 0.6% faster. These tiny deltas indicate that the i5-9400 is in a crowded field of similar-performing CPUs, and the combo's rank is more influenced by the GPU than by the CPU.

Settings Recommendations

Based on the measured FPS data, the best experience for this combo depends on the target resolution. At 1080p, Ultra settings are the clear recommendation, as the 111.7 FPS average is well above 60 FPS and the visual uplift from High to Ultra is nearly free (only 4.5 FPS difference). For 1440p, High settings at 74.9 FPS offer a good balance, but users with 144 Hz monitors should consider Medium at 106.8 FPS for a smoother experience. At 4K, the data strongly suggests using Low settings, which deliver 75.4 FPS; Medium drops to 54.9 FPS, which may be acceptable for slower-paced simulation gameplay, but High and Ultra are not recommended due to sub-60 FPS averages.

The 1080p Ultra result of 111.7 FPS is the best quality-to-performance ratio in the entire data set, as it offers near-maximum visual fidelity at a frame rate that exceeds most displays' refresh rates. For 4K users, the 75.4 FPS at Low is the only preset that guarantees smoothness, and the 39.2 FPS at Ultra should be avoided unless the user prioritizes visuals over playability.

FAQ

Q: What is the best resolution and settings combo for this system?

A: At 1920x1080 Ultra, the system averages 111.7 FPS, which is the best quality-to-performance balance. For 4K, only Low settings (75.4 FPS) are recommended, as Medium (54.9 FPS) and above fall below 60 FPS.

Q: Is the CPU or GPU the bottleneck in this game?

A: At 4K, the GPU is the clear bottleneck, as evidenced by the steep FPS drop from 75.4 FPS at Low to 39.2 FPS at Ultra. At 1080p, the CPU is not limiting, given the 236.3 FPS result at Low settings.

Q: How does the RX 6650 XT compare to its nearest rival?

A: The RX 6650 XT has an average benchmark score of 29024, while the AMD Radeon RX 6800M scores 29011, a 0% delta. This indicates they perform nearly identically in synthetic tests.

Q: What is the FPS difference between 1080p and 4K at Ultra settings?

A: The system achieves 111.7 FPS at 1080p Ultra and 39.2 FPS at 4K Ultra, a 64.9% reduction. This confirms that the GPU cannot handle 4K Ultra in this game.

Q: Is the i5-9400 a weak link for this GPU?

A: No, the CPU's 50th percentile ranking is average, but the 147.5 FPS at 1440p Low shows it can keep up with the GPU. The bottleneck is the GPU at higher resolutions, not the CPU.

Q: Can this system run the game at 1440p with high settings?

A: Yes, at 2560x1440 High, the average FPS is 74.9, which is above the 60 FPS playability threshold. Ultra at 1440p yields 69.6 FPS, which is also acceptable.