Pc Building Simulator

# Pc Building Simulator — AMD Ryzen 5 8400F + NVIDIA GeForce RTX 4090

The pairing of AMD's 6-core Zen 4 Phoenix desktop chip with NVIDIA's flagship Ada Lovelace GPU produces a fascinating split in Pc Building Simulator's benchmark data. At 1080p Low, the combo reaches 370.5 FPS, while 4K Ultra drops to 82.8 FPS — a 4.5x spread that reveals how this simulation title transitions from a CPU-bound state at low resolutions to a GPU-bound state at 4K. The measured rows show a system that is capable of triple-digit frame rates across nearly every setting, yet the scaling pattern raises questions about where the true bottleneck lies at each step.

Resolution Scaling

The FPS deltas between 1080p, 1440p, and 4K tell a clear story about component limits. At Low settings, the progression from 370.5 FPS (1080p) to 322 FPS (1440p) to 170 FPS (4K) shows a 13% drop from 1080p to 1440p, but a 47% drop from 1440p to 4K. This accelerating decline indicates that the CPU is holding frame rates relatively steady at lower pixel counts, while the GPU begins to struggle as pixel count quadruples from 1440p to 4K.

Moving to Ultra settings, the pattern shifts. The combo delivers 250.7 FPS at 1080p, 158.9 FPS at 1440p, and 82.8 FPS at 4K — a 37% reduction from 1080p to 1440p, then another 48% reduction to 4K. The larger relative drop at 1440p Ultra compared to 1440p Low suggests that higher settings amplify the GPU's workload faster than resolution alone. At 1080p Ultra, the 250.7 FPS result is still far above display refresh rates, implying the CPU is not yet the limiting factor even with maxed settings.

The Medium preset offers a useful midpoint: 326.7 FPS at 1080p, 233.9 FPS at 1440p, and 122.7 FPS at 4K. The 4K Medium figure is 48% higher than 4K Ultra, indicating that the GPU's compute resources are the primary constraint at 4K. Interestingly, the 1080p Medium to 1080p High delta is only 64.3 FPS (326.7 to 262.4), while the 1080p High to 1080p Ultra delta is just 11.7 FPS — suggesting diminishing returns from High to Ultra at lower resolutions.

FAQ

Q: Does the CPU or GPU bottleneck this game at 4K Ultra?

A: Benchmark results indicate the GPU is the limiting component at 4K Ultra, where the combo achieves 82.8 FPS. The RTX 4090's 24 GB VRAM and 1.01 TB/s bandwidth are sufficient, but the 82.58 TFLOPS FP32 throughput appears to cap performance at this resolution and settings combination.

Q: What frame rate can this combo achieve at 1080p with High settings?

A: At 1920x1080 with High settings, the measured average FPS is 262.4. This is well above the 144 Hz range, indicating the Ryzen 5 8400F's 6 cores and 12 threads are not holding back the RTX 4090 at this resolution.

Q: How does the 8400F compare to its nearest CPU rivals?

A: The 8400F's average benchmark score of 25064 places it within 0.3% of the AMD Ryzen 5 7500F (24993), and it effectively ties the AMD Ryzen 7 2700X (25057, deltaPct 0). It trails the AMD Ryzen AI 5 PRO 340 by 0.1% and the AMD EPYC 9474F by 0.2%.

Q: Is the RTX 4090's performance consistent with its GPU benchmark percentile?

A: The RTX 4090 sits in the 91st percentile among all GPUs with an average benchmark score of 66473. In Pc Building Simulator, its 4K Ultra result of 82.8 FPS aligns with its top-tier positioning, though the game's simulation nature may not fully stress the GPU's 16,384 shading units.

Q: What is the best resolution for competitive frame rates?

A: For maximum FPS, 1080p Low delivers 370.5 FPS. Even 1440p Low achieves 322 FPS, while 4K Low still hits 170 FPS — all far above typical 60 FPS targets, making the choice dependent on display capabilities rather than playability.

Q: Does the 8400F's boost clock matter for this game?

A: The 8400F's 4.70 GHz boost clock and 4.20 GHz base clock contribute to its single-thread performance, which is relevant for simulation logic. Its 3dmark_single_thread score of 951 and cinebench_r23_singlecore score of 2943 indicate robust per-core performance for this genre.

Settings Recommendations

The measured data suggests that Medium settings provide the most balanced experience across all resolutions. At 1080p Medium, the combo delivers 326.7 FPS — only 12% below the Low preset's 370.5 FPS but with substantially better visual fidelity. At 1440p Medium, 233.9 FPS remains exceptionally high, and even 4K Medium at 122.7 FPS exceeds 120 Hz displays.

High settings offer a modest visual upgrade over Medium but with measurable FPS costs: 262.4 FPS at 1080p (a 20% drop from Medium), 162.9 FPS at 1440p (a 30% drop), and 85.4 FPS at 4K (a 30% drop). The Ultra preset's gains are marginal compared to High — only 11.7 FPS better at 1080p (250.7 vs 262.4) and 2.6 FPS better at 4K (82.8 vs 85.4) — making Ultra a poor trade-off for the visual difference.

For users targeting 60 FPS at 4K, both High and Ultra satisfy the requirement, but Medium at 122.7 FPS provides headroom for frame pacing. At 1440p, Medium's 233.9 FPS is the sweet spot for high-refresh monitors, while 1080p users can comfortably run High at 262.4 FPS without sacrificing much performance.

Measured FPS Breakdown

At 1920x1080, the combo scales from 370.5 FPS at Low to 326.7 FPS at Medium, then 262.4 FPS at High, and 250.7 FPS at Ultra. The Low-to-Medium penalty is 43.8 FPS (11.8%), while Medium-to-High costs 64.3 FPS (19.7%), and High-to-Ultra costs only 11.7 FPS (4.5%).

At 2560x1440, the pattern shifts: Low delivers 322 FPS, Medium drops to 233.9 FPS (a 27.4% reduction), High reaches 162.9 FPS (a 30.4% further drop), and Ultra bottoms out at 158.9 FPS (only 2.5% below High). The 1440p results show a steeper Medium-to-High penalty than at 1080p, suggesting the GPU's rasterization load increases non-linearly with resolution.

At 3840x2160, the numbers compress dramatically: Low hits 170 FPS, Medium reaches 122.7 FPS (a 27.8% drop), High manages 85.4 FPS (a 30.4% drop), and Ultra falls to 82.8 FPS (a 3.0% drop from High). The 4K Ultra result is only 48.7% of the 4K Low figure, highlighting the GPU's dominant role at this resolution.

Comparing across resolutions at the same setting, Low shows the smallest absolute drops (370.5 to 322 to 170), while Ultra shows the largest proportional decline (250.7 to 158.9 to 82.8). This gradient confirms that the RTX 4090's 24 GB frame buffer and 384-bit memory interface are not the constraint; rather, the 82.58 TFLOPS compute ceiling becomes visible at 4K.

How This Combo Ranks

Among 1769 tested combinations in Pc Building Simulator, this pairing of Ryzen 5 8400F and RTX 4090 holds the 46th position. This places it in the top 2.6% of all tested combos, which is notable given the mid-range CPU paired with the flagship GPU. The rank reflects the game's moderate CPU demands — the 8400F's 6 cores and 12 threads are sufficient to avoid bottlenecking the RTX 4090 at most settings.

The ranking gap between this combo and the top 45 systems likely stems from CPUs with higher multi-threaded scores. The 8400F's cinebench_r23_multicore score of 20851 and passmark_multithread score of 24530 are respectable but not class-leading. In a simulation game where CPU logic can influence frame times, the 8400F's 3dmark_max_threads score of 6165 suggests that additional cores or higher boost clocks could push this combo higher in the rankings.

The 46th rank out of 1769 also indicates that Pc Building Simulator is not a GPU-bound title at lower resolutions — otherwise, the RTX 4090's 91st GPU percentile would likely secure a higher system rank. The data implies that CPU selection matters more in this game than in typical shooters, making the 8400F's 4.70 GHz boost clock a meaningful contributor to the final ranking.

CPU Role

The Ryzen 5 8400F's Zen 4 Phoenix architecture on TSMC's 4 nm process provides 6 cores and 12 threads with a base clock of 4.20 GHz and boost clock of 4.70 GHz. Its 16 MB shared L3 cache and 1 MB L2 per core are moderate for modern standards, yet the chip's 3dmark_single_thread score of 951 and cinebench_r23_singlecore of 2943 indicate strong per-thread performance.

The CPU's 82nd percentile ranking among all CPUs, with an average benchmark score of 25064, places it just 0.3% ahead of the Ryzen 5 7500F and effectively tied with the Ryzen 7 2700X. This tight clustering among rivals suggests that the 8400F's performance in Pc Building Simulator is not exceptional but adequate — the 1080p Low result of 370.5 FPS demonstrates that the CPU can feed the GPU sufficiently at lower resolutions.

The 65W TDP and unlocked multiplier offer headroom for overclocking, which could improve the 2-thread score of 1874 and 4-thread score of 3563 — metrics that may matter for simulation logic. The 83.2 GB/s memory bandwidth on DDR5 dual-channel is sufficient for this game, though the 8400F's lack of integrated graphics means the RTX 4090 handles all rendering.

GPU Role

The RTX 4090's 24 GB of GDDR6X memory on a 384-bit bus provides 1.01 TB/s bandwidth, eliminating any memory capacity concerns in Pc Building Simulator. Its 2,520 MHz boost clock and 16,384 shading units deliver 82.58 TFLOPS FP32, which the measured FPS data shows is the limiting factor at 4K Ultra (82.8 FPS) but overkill at 1080p Low (370.5 FPS).

The GPU's 91st percentile ranking with an average benchmark score of 66473 places it just 0.4% behind the Tesla T4 and 1.3% ahead of the Quadro P6000. In this game, the RTX 4090's 128 RT cores and 512 tensor cores are largely unused, as Pc Building Simulator likely relies on traditional rasterization — the passmark_directx_11 score of 326 and directx_12 score of 150 confirm that DX11 and DX12 paths are the primary workloads.

The 450W TDP and triple-slot design are substantial, but the 850W suggested PSU ensures stable operation. The 4K Medium result of 122.7 FPS versus 4K High at 85.4 FPS shows that the GPU's compute units scale predictably with settings, while the 1080p results across settings (370.5 to 250.7) indicate the GPU is never fully saturated at this resolution — leaving the CPU as the more influential component at 1080p.