Doom

The AMD Ryzen 9 9900X and Radeon RX 6750 XT combination delivers a highly capable 1080p and 1440p experience in Doom, but 4K Ultra pushes the GPU to its limit. The benchmark data shows a system where the CPU is rarely the bottleneck, with frame rates scaling almost entirely with GPU load and graphics presets.

Resolution Scaling

The FPS drop from 1080p to 4K is steep and tells a clear story about where the performance ceiling lies. At High settings, the average frame rate falls from 178 FPS at 1920x1080 to 115 FPS at 2560x1440, a 35% reduction, and then to 62 FPS at 3840x2160, a further 46% drop from 1440p. This progressive decline is characteristic of a GPU-bound scenario; the RX 6750 XT is doing the heavy lifting, and the increasing pixel count directly translates into lower output.

The scaling pattern is even more pronounced at the lower presets. At Low settings, the system achieves 242 FPS at 1080p, drops to 156 FPS at 1440p, and then falls to 85 FPS at 4K. The fact that the 1080p Low result is so high suggests the CPU has ample headroom, but the 4K result shows the GPU is struggling to maintain high frame rates at that resolution. The gap between 1080p and 4K at Low settings is 157 FPS, which is a massive 65% decrease, highlighting that the GPU is the primary limiting component even when visual fidelity is reduced.

At Medium settings, the pattern holds: 210 FPS at 1080p, 136 FPS at 1440p, and 74 FPS at 4K. The percentage drop from 1080p to 1440p is 35%, and from 1440p to 4K is 46%, mirroring the High preset results. This consistency across presets indicates that the resolution scaling is independent of the graphics settings, further confirming the GPU's role as the performance bottleneck. The CPU, a 12-core Zen 5 part with a boost clock of 5.60 GHz, is not the constraint here; the data suggests it can feed frames well beyond what the GPU can render at higher resolutions.

Settings Recommendations

For the best experience, the data points to Medium settings as the sweet spot, particularly for high refresh rate displays. At 1920x1080, the Medium preset delivers 210 FPS average, which is a 32 FPS improvement over High (178 FPS) and only 32 FPS behind the Low preset (242 FPS). The Medium preset at 1080p also includes a measured minimum of 179 FPS, ensuring smooth gameplay even in demanding scenes.

At 2560x1440, Medium is still the recommended choice. It provides an average of 136 FPS with a minimum of 116 FPS, which is comfortably above the 100 FPS mark for a fluid experience. While High at 1440p yields 115 FPS, the Medium preset offers a 21 FPS advantage with minimal visual compromise in a fast-paced title like Doom. The Ultra preset at 1440p drops to 94 FPS, which is below the 100 FPS threshold and not worth the extra graphical load for the marginal visual gain.

At 4K resolution, the choices are more constrained. The High preset achieves 62 FPS, which is playable but not ideal for a competitive FPS. The Medium preset hits 74 FPS, which is a better target, but the Low preset is the only one that breaks the 85 FPS mark. Given that the game is a fast-paced shooter, the Medium preset at 4K appears to be the most balanced choice, offering 74 FPS without resorting to the lowest visual quality. Ultra at 4K is not recommended, as it drops to 51 FPS, which is below the acceptable threshold for smooth gameplay.

GPU Role

The AMD Radeon RX 6750 XT is the defining component in this system's gaming performance. Its 12 GB of GDDR6 memory on a 192-bit bus provides a bandwidth of 432.0 GB/s, which is sufficient for the textures and geometry in Doom at 1080p and 1440p. The GPU has a base clock of 2150 MHz and a boost clock of 2600 MHz, with a game clock of 2495 MHz, and these high frequencies are likely a key factor in the strong 1080p performance.

The benchmark results show the GPU is the primary driver of frame rate differences between presets. The shift from Low to Ultra at 1080p yields a 97 FPS difference (242 vs 145), which is almost entirely due to the GPU's rendering workload. The RX 6750 XT's 2560 shading units and 64 ROPs are responsible for this output, and the data indicates they are being fully utilized at higher resolutions and settings. At 4K, the GPU is clearly overtaxed, as evidenced by the 51 FPS result at Ultra, which is less than half the 1080p Low result.

The GPU's position in the market is also relevant. It holds a 71st percentile ranking among all GPUs in the database, and its average benchmark score of 26011 places it near competitors like the AMD Radeon R9 M395X and the NVIDIA GeForce RTX 3080 Ti Mobile. However, in this specific game, the measured FPS data reveals that the GPU can handle 1440p High settings with a 115 FPS average, but it cannot maintain a solid 60 FPS at 4K Ultra. The data confirms that for 4K gaming, the RX 6750 XT is the limiting factor, and users should target 1440p or lower for optimal performance.

How This Combo Ranks

This specific combination of the Ryzen 9 9900X and RX 6750 XT ranks 1696 out of 3712 tested combos in Doom. This places it in the upper half of all tested systems, but it is not a top-tier performer. The ranking is likely held back by the GPU, as the CPU is a high-end part with a 92nd percentile ranking among all CPUs. The GPU's 71st percentile ranking is lower, which suggests that the combo's performance is constrained by the graphics card in this title.

The CPU's nearest rivals include the Intel Core i9-14900, which has a slightly higher average benchmark score (58115 vs the 9900X's 57498, a delta of -1.1%), and the AMD EPYC 9015, which is nearly identical in score (57555, a delta of -0.1%). This indicates that the Ryzen 9 9900X is a very strong processor, capable of keeping up with or exceeding other top-tier chips. The GPU's nearest rivals, such as the AMD FirePro W7100 and the AMD Radeon R9 M395X, are older or different-class parts, but the RX 6750 XT's average score of 26011 is only 0.5% to 0.7% higher, showing it is competitive with those parts in general benchmarks.

In the context of Doom, the combo's rank of 1696 suggests that while the CPU provides a solid foundation, the GPU limits the system to mid-pack performance. The data implies that a system with a less powerful CPU but a more powerful GPU would likely achieve a higher rank in this specific game, as the frame rates are so heavily dependent on the graphics card.

CPU Role

The AMD Ryzen 9 9900X is a 12-core, 24-thread processor based on the Zen 5 architecture, with a base clock of 4.40 GHz and a boost clock of 5.60 GHz. It has a large 64 MB L3 cache and supports DDR5 memory. In Doom, the CPU's role is to feed the GPU with draw calls and game logic, and the data suggests it performs this task with ease.

The measured FPS at 1080p Low settings (242 FPS) is a strong indicator that the CPU is not a bottleneck. Even at High settings, the 1080p result of 178 FPS is well above what the GPU can deliver at higher resolutions. The fact that the frame rate scales so predictably with resolution and settings indicates that the CPU is capable of maintaining a high frame rate ceiling, and the GPU is the sole limiting factor when it drops.

The CPU's benchmark scores support this conclusion. Its Cinebench R23 multi-core score of 32172 and single-core score of 2253 are indicative of a very fast processor. Its PassMark single-thread score of 4672 is also high, which is crucial for gaming. The CPU's 3DMark single-thread score of 1286 is a direct measure of its gaming performance potential, and it is likely a key reason why the system can achieve such high frame rates in 1080p. The data shows that the CPU is not the bottleneck in this combo, and its performance headroom is significant, meaning that users could upgrade the GPU in the future without needing to change the processor.

Measured FPS Breakdown

The complete set of measured average frame rates is as follows:

At 1920x1080, the Low preset delivers the highest average at 242 FPS. The Medium preset averages 210 FPS, with a minimum of 179 FPS and a maximum of 242 FPS. The High preset averages 178 FPS, and the Ultra preset averages 145 FPS. These results show a clear progression, with each step up in settings costing approximately 30-35 FPS.

At 2560x1440, the Low preset averages 156 FPS. The Medium preset averages 136 FPS, with a minimum of 116 FPS and a maximum of 157 FPS. The High preset averages 115 FPS, and the Ultra preset averages 94 FPS. The pattern is consistent with 1080p, but the absolute numbers are lower due to the increased pixel count.

At 3840x2160, the Low preset averages 85 FPS. The Medium preset averages 74 FPS, with a minimum of 63 FPS and a maximum of 85 FPS. The High preset averages 62 FPS, and the Ultra preset drops to 51 FPS. This is the only resolution where the Low preset is the only one to exceed 80 FPS, and the Ultra preset falls below 60 FPS, making it the least playable configuration.

The data also includes minimum and maximum FPS for the Medium preset at each resolution. At 1080p, the minimum is 179 FPS and the maximum is 242 FPS, which matches the Low preset average. At 1440p, the minimum is 116 FPS and the maximum is 157 FPS, which is close to the Low preset average. At 4K, the minimum is 63 FPS and the maximum is 85 FPS, which is the same as the Low preset average. This suggests that the Medium preset is well-optimized, with frame time consistency that keeps the minimum close to the average. The lack of min/max data for other presets prevents a full comparison, but the available data indicates that the Medium preset offers a stable experience.