Pc Building Simulator

Pc Building Simulator is a simulation title that tasks players with assembling and troubleshooting virtual hardware, and the benchmark data for the AMD Ryzen 9 8945HX paired with the NVIDIA GeForce RTX 4090 Mobile paints a clear picture of a system that is overwhelmingly GPU-bound at higher resolutions. The measured frame rates show a dramatic scaling curve from 1080p to 4K, with the combination of a high-core-count mobile CPU and a flagship mobile GPU delivering playable results across the board, though the headroom at lower resolutions reveals a significant bottleneck in the graphics subsystem.

Resolution Scaling

The frame rate progression from 1920x1080 to 3840x2160 clearly identifies the NVIDIA GeForce RTX 4090 Mobile as the primary limiting factor. At 1080p with Low settings, the system produces an average of 370 FPS. Moving to 1440p Low drops that to 233 FPS, a reduction of 137 FPS, and at 4K Low the average falls to 122 FPS. This steep decline—a 67% reduction from 1080p to 4K at Low settings—indicates that the CPU has ample headroom to feed frames, but the GPU's rendering workload scales almost linearly with pixel count.

The scaling pattern becomes even more pronounced when examining the Medium preset. At 1080p Medium, the combo achieves 262 FPS, which drops to 165 FPS at 1440p and 86 FPS at 4K. The delta between 1080p and 1440p is 97 FPS, while the delta between 1440p and 4K is 79 FPS, showing a slightly more moderate decline at the highest resolution step. This suggests that while the GPU is still the main constraint, the memory bandwidth of 576.0 GB/s is sufficient to prevent a catastrophic collapse at 4K.

High settings tell a similar story. The system delivers 185 FPS at 1080p, 117 FPS at 1440p, and 61 FPS at 4K. The 4K High result, while technically above the 60 FPS threshold, leaves little margin for demanding scenes. Ultra settings, however, push the GPU to its limits: 176 FPS at 1080p, 111 FPS at 1440p, and 58 FPS at 4K. The 4K Ultra figure falls just short of 60 FPS, indicating that the RTX 4090 Mobile's 16 GB of GDDR6 memory and 32.98 TFLOPS of FP32 compute are not quite enough to maintain a locked 60 FPS at maximum quality.

The fact that 1080p Low yields 370 FPS while 4K Ultra yields 58 FPS demonstrates a 6.4x performance gap purely from resolution and settings changes. This confirms that the AMD Ryzen 9 8945HX, with its 16 cores and 32 threads, is never the bottleneck in this configuration. The CPU's boost clock of 5.40 GHz and 64 MB of L3 cache are more than adequate for a simulation title that relies on physics calculations and logic rather than raw graphical complexity.

How This Combo Ranks

In the database of tested combinations, this specific pairing of the AMD Ryzen 9 8945HX and NVIDIA GeForce RTX 4090 Mobile achieves a combo rank of 785 out of 3,723 tested configurations. This places the system in the top 21% of all combos, a strong result for a mobile platform. The percentile ranking reflects the fact that while both components are high-end, the mobile RTX 4090 is not the absolute fastest GPU in the database, and the Ryzen 9 8945HX, despite its desktop-class core count, faces stiff competition from newer desktop parts.

The CPU's own benchmark scores support this positioning. With an average benchmark score of 76,212, the Ryzen 9 8945HX sits at the 95th percentile among all CPUs. Its nearest rivals include the Intel Core Ultra 9 285HX with a score of 76,155 (a 0.1% delta), the AMD EPYC Embedded 8224P at 76,492 (-0.4%), and the AMD Ryzen Threadripper PRO 9945WX at 76,513 (-0.4%). The AMD Ryzen 9 9950X3D trails slightly at 75,779 (0.6% delta). These margins are minuscule, meaning the 8945HX is effectively tied with several flagship desktop and server processors in raw compute.

For the GPU, the RTX 4090 Mobile averages 43,667 in benchmarks, placing it at the 84th percentile among all GPUs. Its nearest rival is the NVIDIA RTX A6000 at 44,075 (-0.9% delta), while the NVIDIA Quadro M6000 at 43,301 (0.8%) and the GeForce RTX 5050 Mobile at 43,268 (0.9%) are close behind. The fact that a mobile GPU trades blows with professional workstation cards underscores its capability, but the 84th percentile shows that there are faster options available, particularly in the desktop segment.

The gap between the CPU's 95th percentile and the GPU's 84th percentile explains the combo rank. The CPU is performing at an elite level, while the GPU is merely very good. In Pc Building Simulator, this imbalance results in the GPU being the limiting component across all tested settings, which is a typical outcome for a high-core-count CPU paired with a mobile flagship GPU.

CPU Role

The AMD Ryzen 9 8945HX is a 16-core, 32-thread processor based on the Zen 4 architecture, codenamed Dragon Range. It operates at a base clock of 2.50 GHz and boosts to 5.40 GHz, with a 55 W TDP that allows for sustained performance in a mobile chassis. The CPU's 64 MB of L3 cache is shared across all cores, and each core has 64 KB of L1 and 1 MB of L2 cache. The 5 nm process node from TSMC packs 13,140 million transistors onto two 71 mm² dies.

In Pc Building Simulator, the CPU's role is to handle the simulation logic, component compatibility checks, and system boot sequences. The 16 cores and 32 threads provide massive parallel processing capability, which is reflected in the Cinebench R23 multi-core score of 42,713. The single-core score of 6,030 is equally strong, indicating that the 5.40 GHz boost clock is effective in lightly threaded workloads.

The benchmark data shows that the CPU is never the bottleneck. At 1080p Low, the system produces 370 FPS, which is far beyond what any display can refresh. Even at 1080p Ultra, the 176 FPS average indicates that the CPU can feed the GPU at very high rates. The 8945HX's PassMark single-thread score of 3,907 and multithread score of 51,405 suggest that both single-core and multi-core performance are sufficient for this game's demands.

The processor's memory bandwidth of 83.2 GB/s over dual-channel DDR5 is modest compared to the GPU's 576.0 GB/s, but this does not hinder performance in this title. The simulation genre typically does not require massive memory throughput, and the 64 MB L3 cache helps mitigate any potential latency issues. The CPU's PCIe Gen 5 support with 28 lanes provides ample bandwidth for the GPU, though the RTX 4090 Mobile uses a PCIe 4.0 x16 interface.

Measured FPS Breakdown

The measured FPS data covers four settings presets across three resolutions, providing a comprehensive view of performance. At 1920x1080, the system delivers 370 FPS on Low, 262 FPS on Medium (with a minimum of 222 and maximum of 301), 185 FPS on High, and 176 FPS on Ultra. The 1080p results show that the game is heavily GPU-limited even at the lowest settings, as the CPU could theoretically push even higher frame rates given the 370 FPS ceiling on Low.

Moving to 2560x1440, the frame rates drop significantly. Low settings produce 233 FPS, Medium averages 165 FPS (with a minimum of 140 and maximum of 190), High averages 117 FPS, and Ultra averages 111 FPS. The gap between High and Ultra at 1440p is only 6 FPS, suggesting that the Ultra preset adds minimal visual benefit for the performance cost at this resolution. The Medium preset's minimum of 140 FPS ensures smooth gameplay even in complex scenes.

At 3840x2160, the GPU is pushed to its limits. Low settings yield 122 FPS, Medium averages 86 FPS (with a minimum of 73 and maximum of 99), High averages 61 FPS, and Ultra averages 58 FPS. The 4K results show a clear threshold: Medium settings maintain a comfortable margin above 60 FPS, while High is right at the edge and Ultra falls below. The minimum FPS of 73 at 4K Medium indicates that even in demanding moments, the system stays well above playable thresholds.

The data reveals that the Medium preset is the sweet spot for this game at high resolutions. At 4K Medium, the 86 FPS average provides smooth gameplay with a 73 FPS minimum, leaving headroom for occasional dips. At 1440p Medium, the 165 FPS average is excellent for high-refresh-rate displays, and the 1080p Medium result of 262 FPS is more than sufficient for any gaming monitor.

GPU Role

The NVIDIA GeForce RTX 4090 Mobile is built on the Ada Lovelace architecture using the AD103 chip, manufactured on a 5 nm process at TSMC. It packs 45,900 million transistors on a 379 mm² die, with a transistor density of 121.1M per mm². The GPU features 9,728 shading units, 304 texture mapping units, and 112 raster operation pipelines. It also includes 76 ray tracing cores and 304 tensor cores, supporting DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

The GPU operates at a base clock of 1335 MHz and a boost clock of 1695 MHz, with memory running at 2250 MHz (18 Gbps effective). The 16 GB of GDDR6 memory on a 256-bit bus provides 576.0 GB/s of bandwidth. The FP32 performance is rated at 32.98 TFLOPS, with matching FP16 performance at a 1:1 ratio. The pixel rate is 189.8 GPixel/s, and the texture rate is 515.3 GTexel/s.

In Pc Building Simulator, the GPU is responsible for rendering the 3D workspace, component models, and case visuals. The game is not graphically demanding compared to AAA titles, but the high frame rates achieved indicate that the RTX 4090 Mobile is capable of handling this workload with ease. The 16 GB of VRAM is more than sufficient for the game's textures and geometry, and the 576.0 GB/s bandwidth prevents any memory-related bottlenecks.

The GPU's PassMark G3D score of 27,212 and G2D score of 984 show strong 2D and 3D performance. The DirectX 12 score of 107 and DirectX 11 score of 262 highlight the GPU's capability in modern API workloads. The Geekbench OpenCL score of 180,831 and Vulkan score of 170,774 further demonstrate the GPU's compute potential. However, the 84th percentile ranking among all GPUs indicates that there are faster options, which is expected for a mobile part.

The fact that the GPU becomes the limiting factor at 4K Ultra, where it produces 58 FPS, shows that the 32.98 TFLOPS of compute power is not unlimited. The 1695 MHz boost clock is relatively modest for a flagship GPU, and the 120 W TDP limits sustained performance in a mobile chassis. For a simulation game like Pc Building Simulator, the GPU delivers ample performance, but users seeking to push 4K Ultra with a locked 60 FPS would need a more powerful desktop GPU.

Settings Recommendations

Based on the measured FPS data, the Medium preset offers the best balance of visual quality and performance across all resolutions. At 3840x2160, Medium delivers 86 FPS with a minimum of 73 FPS, providing a comfortable margin above the 60 FPS target. The 4K High preset, at 61 FPS, is technically playable but leaves no headroom for frame drops, and 4K Ultra at 58 FPS falls below the threshold. Therefore, 4K users should select Medium for a smooth experience, or High if they can tolerate occasional dips below 60 FPS.

At 2560x1440, the Medium preset's 165 FPS average is ideal for high-refresh-rate monitors. The 1440p High preset at 117 FPS is also excellent for 120 Hz displays, while Ultra at 111 FPS offers a marginal visual upgrade with only a 6 FPS penalty. For competitive play or maximum smoothness, 1440p Medium is the recommended choice, but High is equally viable for most users.

At 1920x1080, all settings are playable, with Low hitting 370 FPS, Medium at 262 FPS, High at 185 FPS, and Ultra at 176 FPS. The difference between High and Ultra at 1080p is only 9 FPS, making Ultra the better choice for visual fidelity without sacrificing frame rate. The 1080p Low preset's 370 FPS is excessive for any display, so users should prioritize higher settings. The recommended configuration is 1080p Ultra for the best visual experience, or 1080p High if maximum frame rates are desired.

Ultimately, the data shows that this combo is best utilized with Medium settings at 4K, High or Ultra at 1440p, and Ultra at 1080p. The GPU's performance headroom at lower resolutions means that users can maximize visual quality without concerns, while the 4K Ultra setting should be avoided due to the sub-60 FPS result. The benchmark results indicate that the system is well-suited for Pc Building Simulator at high settings, with the Medium preset providing the most consistent experience across all resolutions.