Pc Building Simulator

# Pc Building Simulator: AMD Ryzen 9 8945HX + NVIDIA GeForce RTX 4070 Mobile

This mobile flagship pairing delivers a genuinely playable experience across the board in Pc Building Simulator, though the performance curve reveals a system that is clearly GPU-bound at higher resolutions while enjoying massive headroom at 1080p. The data shows a combo that ranks in the 54th percentile of all tested configurations, which is respectable for a laptop-class part, but the real story is how the scaling behaves when you push resolution and settings.

Resolution Scaling

The FPS drop from 1080p to 4K is steep and consistent, which points directly at the GPU as the primary limiter in this simulation title. At High settings, the average frame rate falls from 133 FPS at 1920x1080 to 84 FPS at 2560x1440, then further down to 44 FPS at 3840x2160. That represents a 67% reduction in average FPS when moving from 1080p to 4K, which is a classic sign of a GPU that is being saturated by pixel count rather than a CPU bottleneck.

Looking at the Low preset, the scaling becomes even more telling. At 1080p Low, the system pushes 266 FPS average, which drops to 168 FPS at 1440p and 88 FPS at 4K. The fact that 4K Low still delivers 88 FPS while 1080p Low hits 266 FPS indicates that the RTX 4070 Mobile has substantial compute headroom at lower resolutions, but the 4K pixel workload cuts into that headroom dramatically. The gap between Low and High at the same resolution is also illuminating: at 1080p, Low gives 266 FPS versus High at 133 FPS (exactly half), while at 4K, Low gives 88 FPS versus High at 44 FPS (again, exactly half). This consistent halving suggests the settings scaling is linear and the GPU is the bottleneck across all resolutions.

The Medium preset at 4K shows 62 FPS average with a minimum of 53 FPS and maximum of 72 FPS, which is the only measured row at that resolution with min/max data. The spread of 19 FPS between min and max indicates some scene complexity variation, but the average stays comfortably above playable thresholds. At 1440p Medium, the average jumps to 119 FPS with a min of 101 FPS and max of 137 FPS, showing a tighter 36 FPS spread relative to the higher average. The 1080p Medium row shows 189 FPS average with a min of 160 FPS and max of 217 FPS, a 57 FPS spread that suggests the CPU is starting to introduce some frame pacing variability at very high frame rates.

The Ultra preset follows the same pattern: 127 FPS at 1080p, 80 FPS at 1440p, and 42 FPS at 4K. Interestingly, the gap between High and Ultra is small at every resolution — only 6 FPS at 1080p (133 vs 127), 4 FPS at 1440p (84 vs 80), and 2 FPS at 4K (44 vs 42). This suggests Ultra is not dramatically more demanding than High in this title, and the GPU is already near its limit at 4K regardless of whether you choose High or Ultra.

How This Combo Ranks

The combo ranks 2006 out of 3723 tested configurations in Pc Building Simulator, placing it in the lower-middle portion of the overall field. This is a notable result because the individual components are strong — the CPU sits in the 95th percentile of all processors and the GPU in the 73rd percentile of all graphics cards — yet the combined ranking in this specific game is only in the 54th percentile. The data suggests that Pc Building Simulator is not particularly demanding on either component, so the combo's ranking is more about what other systems bring to the table rather than any deficiency in this pairing.

The CPU's nearest rivals show how close the top-end mobile and desktop parts are in synthetic benchmarks. The Intel Core Ultra 9 285HX scores 0.1% higher on average, while the AMD EPYC Embedded 8224P and AMD Ryzen Threadripper PRO 9945WX both score 0.4% lower. The AMD Ryzen 9 9950X3D scores 0.6% higher. These deltas are all within 1%, meaning the Ryzen 9 8945HX is effectively tied with the best available processors on average benchmark score, despite being a mobile part with a 55 W TDP.

On the GPU side, the RTX 4070 Mobile is essentially neck-and-neck with desktop-class parts in average score. The AMD Radeon RX 6700 XT matches it exactly (0% delta), while the NVIDIA GeForce RTX 3090 is 0.5% slower and the AMD Radeon Pro Vega 20 is 1.5% slower. Only the NVIDIA RTX PRO 4000 Blackwell edges it out at 1.1% faster. This is remarkable for a mobile GPU with a 115 W TDP, showing that the Ada Lovelace architecture delivers desktop-level compute in a laptop form factor.

The discrepancy between the component-level percentiles and the in-game combo rank highlights that Pc Building Simulator is not a stress test for high-end hardware. A system with a weaker GPU but a faster CPU might rank higher in this specific title if the game is more CPU-sensitive at the resolutions tested. The data shows the combo is capable of very high frame rates at 1080p, but the ranking suggests many other combos achieve similar or better results in this simulation genre.

CPU Role

The AMD Ryzen 9 8945HX is a 16-core, 32-thread processor based on Zen 4 architecture, built on TSMC's 5 nm process. It has a base clock of 2.50 GHz and a boost clock of 5.40 GHz, with a TDP of 55 W. The cache hierarchy includes 64 KB of L1 per core, 1 MB of L2 per core, and 64 MB of L3 total. It supports DDR5 memory in dual-channel configuration with a memory bandwidth of 83.2 GB/s, and it connects via PCIe Gen 5 with 28 lanes.

For Pc Building Simulator, the CPU's role is primarily about maintaining high frame rates at lower resolutions where the GPU is not the bottleneck. The benchmark data shows that at 1080p Low, the system achieves 266 FPS average, which is a frame rate that requires strong single-thread performance to avoid CPU limiting. The Cinebench R23 single-core score of 6030 and multi-core score of 42713 indicate excellent per-thread and multi-thread capability, which explains why the system can push past 200 FPS at 1080p without the CPU becoming a constraint.

The PassMark multithread score of 51405 and single-thread score of 3907 further confirm that this CPU has the headroom to feed the GPU at high frame rates. The data compression score of 677755 and encryption score of 40836 are high, but these are more relevant to productivity workloads than gaming. The floating point math score of 117453 and integer math score of 195180 show strong ALU performance, which could help in simulation games that do physics calculations on the CPU.

At 4K resolution, the CPU's role diminishes because the GPU becomes the limiting factor. The fact that 4K Low (88 FPS) is exactly half of 1080p Low (266 FPS) suggests the GPU is fully saturated at 4K, and the CPU is not holding anything back. Even at 4K Ultra (42 FPS), the CPU is likely idling in terms of load, as the GPU is struggling to maintain playable frame rates. This is typical for a simulation game where the GPU workload scales with pixel count and settings, while the CPU workload remains relatively constant.

The Ryzen 9 8945HX's 16 cores and 32 threads are more than sufficient for Pc Building Simulator, which likely uses only a handful of threads for its simulation logic. The high boost clock of 5.40 GHz is more relevant to this game than the core count, as single-thread performance drives the frame rate ceiling in CPU-bound scenarios. The 64 MB of L3 cache also helps keep frequently accessed data close to the cores, reducing memory latency in simulation-heavy scenes.

Measured FPS Breakdown

At 1920x1080, the system delivers frame rates that range from excellent to extraordinarily high. The Low preset averages 266 FPS, which is far beyond any display's refresh rate and indicates massive headroom. Medium averages 189 FPS with a minimum of 160 FPS and maximum of 217 FPS, meaning even the worst-case frame drop stays well above 144 Hz. High averages 133 FPS, which is just under the 144 Hz threshold but still smooth for most users. Ultra averages 127 FPS, showing that the jump from High to Ultra costs only 6 FPS at this resolution.

At 2560x1440, performance remains strong but the scaling begins to show. Low averages 168 FPS, Medium averages 119 FPS with a minimum of 101 FPS and maximum of 137 FPS, High averages 84 FPS, and Ultra averages 80 FPS. The Medium preset at 1440p is the sweet spot for high-refresh monitors, as the 101 FPS minimum keeps frame times consistent even in demanding scenes. High and Ultra both dip below the 90 FPS mark, which is still playable but not ideal for competitive play.

At 3840x2160, the system struggles to maintain high frame rates. Low averages 88 FPS, Medium averages 62 FPS with a minimum of 53 FPS and maximum of 72 FPS, High averages 44 FPS, and Ultra averages 42 FPS. The Medium preset at 4K is the only one that stays above 60 FPS on average, and even then, the minimum of 53 FPS means there will be noticeable dips. High and Ultra at 4K are borderline playable for a simulation game where precise timing is not critical, but they are not smooth by any measure.

The min/max data available only for the Medium preset across all resolutions reveals an interesting pattern. At 4K, the spread is 19 FPS (53 to 72), at 1440p the spread is 36 FPS (101 to 137), and at 1080p the spread is 57 FPS (160 to 217). This increasing spread at higher frame rates suggests that the CPU is introducing more frame time variance when the GPU is not the bottleneck, which is typical for simulation games that have variable scene complexity based on what the player is doing in the build simulator.

GPU Role

The NVIDIA GeForce RTX 4070 Mobile is based on the AD106 chip with Ada Lovelace architecture, built on TSMC's 5 nm process with 22,900 million transistors on a 188 mm² die. It has 4608 shading units, 144 texture mapping units, and 48 raster output units, along with 36 ray tracing cores and 144 tensor cores. The base clock is 1395 MHz with a boost clock of 1695 MHz, and it offers 15.62 TFLOPS of FP32 performance. The memory subsystem consists of 8 GB of GDDR6 on a 128-bit bus, delivering 256.0 GB/s of bandwidth at 16 Gbps effective speed.

In Pc Building Simulator, the GPU's role is the primary determinant of frame rates at higher resolutions. The data shows that the RTX 4070 Mobile is capable of 266 FPS at 1080p Low, which means the GPU has significant compute headroom when not pixel-limited. However, the 4K results show the GPU reaching its limits: 88 FPS at Low, 62 FPS at Medium, 44 FPS at High, and 42 FPS at Ultra. This represents a 68% reduction from 1080p Low to 4K Low, which is a larger drop than would be expected from pixel count alone, suggesting that memory bandwidth or fill rate becomes a constraint at 4K.

The 8 GB of VRAM is sufficient for this game at all settings and resolutions tested, as the data does not show any signs of texture thrashing or memory-related stutters. The 256.0 GB/s bandwidth is adequate for the 128-bit bus, but it is likely the limiting factor at 4K Ultra where the game is trying to push higher detail textures and effects. The pixel rate of 81.36 GPixel/s and texture rate of 244.1 GTexel/s are respectable for a mobile part, but they are not enough to maintain high frame rates at 4K Ultra.

The GPU's PassMark G3D score of 19587 and average benchmark score of 27435 place it in the 73rd percentile of all GPUs, which is strong for a mobile part. The DirectX 12 score of 85 and DirectX 11 score of 179 in PassMark are lower than desktop equivalents, but these synthetic tests may not reflect the actual gaming performance in this title. The Geekbench OpenCL score of 109197 and Vulkan score of 108367 show strong compute capability, though these are not directly relevant to a simulation game that likely uses DirectX 11 or 12 rendering.

The RTX 4070 Mobile's nearest rivals in average score include the AMD Radeon RX 6700 XT (0% delta), NVIDIA GeForce RTX 3090 (-0.5% delta), NVIDIA RTX PRO 4000 Blackwell (1.1% delta), and AMD Radeon Pro Vega 20 (-1.5% delta). This places the mobile GPU squarely in desktop-class territory, which explains why it can deliver 266 FPS at 1080p Low. However, the 115 W TDP means it cannot sustain the same clocks as desktop GPUs, and the 4K results reflect this thermal and power constraint.

Settings Recommendations

For 1920x1080 displays, the Ultra preset is the clear choice. The data shows 127 FPS average at Ultra versus 133 FPS at High, a difference of only 6 FPS, and both are well above the 60 Hz threshold. Since the jump from High to Ultra costs almost nothing in performance, there is no reason to settle for High when Ultra delivers nearly identical frame rates. The Medium preset at 189 FPS is only relevant if you have a 240 Hz display and want to maximize frame rates, but the visual quality trade-off is not worth it for a simulation game where you are mostly looking at a workbench and PC components.

For 2560x1440 displays, the Medium preset offers the best balance of visual quality and performance. The 119 FPS average with a minimum of 101 FPS keeps the experience smooth even during demanding scenes, and the 137 FPS maximum shows there is still headroom. High at 84 FPS and Ultra at 80 FPS are both playable but dip below the 90 FPS mark, which can be noticeable on a 144 Hz monitor. If you prefer higher visual fidelity, High is the better choice than Ultra since the difference is only 4 FPS, but Medium is the recommended setting for the best experience.

For 3840x2160 displays, the Medium preset is the only sensible option. The 62 FPS average is just above the 60 Hz threshold, but the 53 FPS minimum means there will be occasional dips below 60. Low at 88 FPS is smoother but sacrifices too much visual quality for a game that benefits from seeing component details clearly. High at 44 FPS and Ultra at 42 FPS are both below 45 FPS, which is not a comfortable experience for a simulation game that requires reading text and interacting with small UI elements. If you have a 4K display, Medium is the recommended setting, and you should accept that the system cannot maintain a locked 60 FPS in all scenes.

The data shows that the RTX 4070 Mobile is best suited for 1080p and 1440p gaming in this title, with 4K being a stretch. At 1080p Ultra, the system delivers 127 FPS, which is excellent. At 1440p Medium, it delivers 119 FPS with a 101 FPS minimum, which is the most consistent experience across all tested configurations. The 4K Medium result of 62 FPS is playable but not ideal, and the min FPS of 53 indicates the system will struggle in complex scenes. For the best overall experience, target 1440p with Medium settings, as this resolution balances visual fidelity with the GPU's capabilities.