Doom

Doom’s performance on the AMD Ryzen 9 7900X and AMD Radeon RX 6750 XT combination is defined by a clear scaling curve: the GPU is the primary bottleneck at 4K, while the CPU’s headroom becomes apparent only at lower resolutions. The data shows a system that delivers a highly playable experience across all settings at 1440p, but requires a deliberate settings choice to hit 60 FPS at 4K. This pairing ranks in the 45th percentile of all tested combos for this title, indicating a balanced, mid-to-high-tier configuration that favors high refresh rates at 1080p over absolute 4K supremacy.

Resolution Scaling

The FPS drop from 1080p to 4K is steep and consistent, revealing a GPU-bound workload at higher resolutions. 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, which is a further 46% drop. This demonstrates that the RX 6750 XT’s rendering capabilities are the limiting factor as pixel count increases. The transition from 1440p to 4K is particularly punishing, suggesting that the GPU’s 12 GB memory and 432.0 GB/s bandwidth are sufficient, but its raw compute throughput (13.31 TFLOPS FP32) is not enough to maintain high frame rates at 4K without compromising settings.

The scaling pattern is similar across all presets. At Low settings, the game runs at 242 FPS at 1080p, drops to 156 FPS at 1440p (a 36% decline), and settles at 85 FPS at 4K (a 45% decline from 1440p). This proportional decrease indicates that the CPU is not a bottleneck even at 1080p, as the frame rate scales almost linearly with resolution. The Ryzen 9 7900X, with its 12 cores and 24 threads boosting up to 5.60 GHz, provides ample processing power; the data shows that the GPU’s workload is the deciding factor in performance degradation. At 4K Ultra, the average FPS drops to 51, making it the only configuration that falls below the 60 FPS threshold, further confirming that the RX 6750 XT is stretched to its limits at this resolution.

Settings Recommendations

For the best experience, the data points to Medium settings as the optimal balance between visual fidelity and frame rate. At 1920x1080, Medium delivers 210 FPS average, which is only 13% slower than Low’s 242 FPS but significantly smoother than Ultra’s 145 FPS. At 2560x1440, Medium hits 136 FPS, keeping the frame rate well above the 120 FPS mark for high-refresh-rate monitors, while High trails at 115 FPS and Ultra drops to 94 FPS. The Medium preset also shows the tightest frame pacing at 1080p, with a minimum of 179 FPS and a maximum of 242 FPS, indicating consistent performance without major stutters.

At 3840x2160, the choice is more critical. High settings produce an average of 62 FPS, which is just above the 60 FPS playability threshold, while Ultra falls to 51 FPS. Medium at 4K yields 74 FPS, offering a comfortable margin above 60 FPS and a 19% improvement over High. Given that the minimum FPS for Medium at 4K is 63, this preset ensures that even the heaviest scenes remain fluid. Therefore, the data recommends Medium as the default preset for this GPU/CPU combo, especially for 4K gaming, as it provides the highest frame rate without sacrificing the visual polish that comes with higher settings. Low settings are only advisable for competitive play at 1080p, where the 242 FPS average maximizes refresh rate potential.

FAQ

Q: What is the highest average FPS achievable at 1080p with this hardware?

A: The highest average FPS is 242, achieved at Low settings. Medium settings deliver 210 FPS, High delivers 178 FPS, and Ultra delivers 145 FPS.

Q: Can this system maintain 60 FPS at 4K with Ultra settings?

A: No. At 3840x2160 with Ultra settings, the average FPS drops to 51, which is below the 60 FPS threshold. High settings just barely reach 62 FPS, while Medium achieves 74 FPS.

Q: How does the frame rate scale from 1080p to 1440p at High settings?

A: The average FPS drops from 178 at 1920x1080 to 115 at 2560x1440, a 35% decrease. This indicates the GPU is the primary limiting factor as resolution increases.

Q: Is the CPU or GPU the bottleneck in Doom with this configuration?

A: The data shows the GPU is the bottleneck at all resolutions. The frame rate drops proportionally with resolution increases, while the Ryzen 9 7900X’s high single-thread performance (2016.5 in Cinebench R23 single-core) ensures the CPU does not hold back the GPU at 1080p.

Q: What is the minimum FPS recorded for Medium settings at 1440p?

A: The minimum FPS is 116, with a maximum of 157 and an average of 136. This shows that Medium settings at 1440p maintain a consistent frame rate above 115 FPS.

Q: How does this combo rank against all other tested systems in Doom?

A: The combination ranks 1696 out of 3712 tested combos, placing it in the 45th percentile. This is a solid mid-range result, reflecting the GPU’s 71st percentile ranking among all GPUs.

Measured FPS Breakdown

The measured FPS data provides a complete picture of performance across three resolutions and four settings. At 1920x1080, the results are as follows: Low averages 242 FPS, Medium averages 210 FPS with a minimum of 179 and a maximum of 242, High averages 178 FPS, and Ultra averages 145 FPS. The gap between Low and Ultra is 97 FPS, showing that the RX 6750 XT can scale its output dramatically based on preset demands.

Moving to 2560x1440, the averages are: Low at 156 FPS, Medium at 136 FPS (minimum 116, maximum 157), High at 115 FPS, and Ultra at 94 FPS. The spread narrows to 62 FPS between Low and Ultra, indicating that the GPU’s workload is becoming more uniform as resolution increases; the 4K results confirm this trend. At 3840x2160, Low averages 85 FPS, Medium averages 74 FPS (minimum 63, maximum 85), High averages 62 FPS, and Ultra averages 51 FPS. The delta between Low and Ultra at 4K is only 34 FPS, a sign that the GPU is saturated and cannot differentiate between presets as effectively as at lower resolutions.

The Medium preset consistently shows the most stable frame delivery, with recorded minimums that are only 15 FPS below the average at 1080p and 10 FPS below the average at 4K. This suggests that the Medium preset is the sweet spot for this hardware, providing a high average frame rate while minimizing frame time spikes.

GPU Role

The AMD Radeon RX 6750 XT is the dominant component in this pairing, and its specifications directly correlate with the observed performance. The GPU operates at a boost clock of 2600 MHz and a game clock of 2495 MHz, with 2560 shading units and 64 ROPs. The 12 GB of GDDR6 memory on a 192-bit bus provides 432.0 GB/s of bandwidth. In Doom, this translates to strong performance at 1080p and 1440p, where the GPU’s 13.31 TFLOPS of FP32 compute is sufficient to push high frame rates. However, at 4K, the pixel rate of 166.4 GPixel/s becomes a limiting factor, as evidenced by the 62 FPS average at High settings.

The GPU’s benchmark scores contextualize its performance. It holds a 71st percentile ranking among all GPUs, with an average benchmark score of 26011. Its nearest rivals include the AMD Radeon R9 M395X, which scores 25891 (0.5% lower), and the NVIDIA GeForce RTX 3080 Ti Mobile, which scores 25740 (1.1% lower). This places the RX 6750 XT in a competitive tier, but the data shows that in Doom, the GPU is clearly the bottleneck at 4K, as the FPS drops do not align with the CPU’s capabilities. The memory bandwidth of 432.0 GB/s is adequate for the game’s textures, but the raw compute power is insufficient to maintain 60 FPS at 4K Ultra, where the average falls to 51 FPS.

CPU Role

The AMD Ryzen 9 7900X provides a robust foundation for the RX 6750 XT, but its role in Doom is secondary. With 12 cores and 24 threads based on the Zen 4 architecture, the CPU boosts up to 5.60 GHz and has a base clock of 4.70 GHz. The 64 MB of L3 cache and 83.2 GB/s of dual-channel DDR5 memory bandwidth ensure that the CPU can feed the GPU without stalling. The CPU’s benchmark results are impressive: a Cinebench R23 multi-core score of 29300 and a single-core score of 2016.5, alongside a PassMark single-thread score of 4238. These numbers place it in the 91st percentile of all CPUs, just 0.6% behind the Intel Core i7-14700F and 0.2% ahead of the AMD EPYC 7313P.

In Doom, the CPU’s impact is most noticeable at 1080p, where the GPU is less stressed. The difference between Low and Ultra at 1080p is 97 FPS, which is a wider margin than at 1440p (62 FPS) or 4K (34 FPS). This indicates that at 1080p, the CPU is capable of driving the GPU to its maximum output, and the frame rate is limited by the GPU’s settings. The high single-thread performance, evidenced by a 3DMark single-thread score of 1093, is crucial for Doom’s engine, which relies heavily on a single main thread. The data shows no signs of CPU throttling, as the frame rates scale predictably with resolution, confirming that the Ryzen 9 7900X is more than adequate for this title and will not bottleneck the RX 6750 XT in any scenario.