Doom

The AMD Ryzen 9 5900X and AMD Radeon RX 7900 XTX combination delivers exceptional performance in Doom, ranking in the top 15% of all tested combos. With 12 cores and 24 threads based on the Zen 3 architecture, the CPU provides ample processing power, while the GPU's 24 GB of GDDR6 memory ensures the game runs flawlessly at all tested resolutions. The measured frame rates confirm that this pairing is well-balanced, though the data reveals a clear shift in bottleneck behavior as resolution increases.

CPU Role

The Ryzen 9 5900X is a 12-core, 24-thread processor from AMD's 5000 series, built on the 7 nm process with a base clock of 3.70 GHz and a boost clock of 4.80 GHz. It features 64 MB of L3 cache and supports DDR4 memory with a dual-channel bus delivering 51.2 GB/s of bandwidth. In synthetic benchmarks, the CPU scores 3,3150 in Cinebench R23 multi-core and 4,680 in single-core, with a PassMark multi-thread score of 39,002. These numbers place it in the 90th percentile of all CPUs, with an average benchmark score of 39,453.

For Doom, the CPU's high single-thread performance is critical. The game's engine relies heavily on a few main threads, and the 5900X's single-core score of 941 in 3DMark and 2,202 in Geekbench ensures those threads are fed efficiently. The multi-core capability also helps with background tasks and any game logic that scales across cores. Compared to its nearest rivals, the Ryzen 9 5900X sits just 0.2% above the AMD EPYC 4245P and 0.9% above the Intel Core i7-13700F, while trailing the Intel Core i7-13700 by 1% and the AMD Ryzen 7 PRO 8845HS by 0.7%. These small deltas indicate that the CPU is not a limiting factor in this combo, as its processing headroom is more than sufficient for the frame rates observed.

GPU Role

The AMD Radeon RX 7900 XTX is the dominant component in this pairing. It uses the Navi 31 chip on a 5 nm process with RDNA 3.0 architecture, featuring 6,144 shading units, 384 TMUs, and 192 ROPs. The GPU operates at a base clock of 1,929 MHz and a boost clock of 2,498 MHz, with 24 GB of GDDR6 memory on a 384-bit bus providing 960.0 GB/s of bandwidth. Its compute power reaches 61.39 TFLOPS FP32, and it scores 31,238 in PassMark G3D and 192,597 in Geekbench Vulkan. The GPU sits in the 85th percentile of all GPUs with an average benchmark score of 44,019.

In Doom, the GPU's memory capacity and bandwidth are more than adequate. The 24 GB VRAM ensures no texture streaming bottlenecks, even at 4K Ultra settings. The GPU's nearest rivals include the AMD Radeon Pro 580 at 0.4% lower performance, the NVIDIA GeForce RTX 4090 Mobile at 0.8% lower, and the NVIDIA Quadro M6000 at 1.6% lower, while the NVIDIA GeForce RTX 4070 Ti is 2% faster. This places the 7900 XTX in a competitive tier, but the measured FPS data shows it is the primary driver of performance differences across settings, as the CPU has ample headroom.

How This Combo Ranks

The combination of the Ryzen 9 5900X and Radeon RX 7900 XTX achieves a combo rank of 241 out of 1,681 tested combinations in Doom. This places the pairing in the top 14.3% of all combos, which is a strong result given the game's age and the high-end nature of both components. The rank reflects that while the GPU is very fast, there are other combinations with slightly more powerful GPUs or better CPU-GPU pairings that achieve higher frame rates. However, the measured data indicates that this combo delivers consistently high performance across all resolutions, with no weak points in the tested settings.

The rank is influenced by the GPU's 85th percentile standing versus the CPU's 90th percentile. This suggests the CPU slightly outperforms the GPU in relative terms, meaning the GPU is the more likely bottleneck at higher resolutions. Still, the overall rank is excellent, and the combo outperforms the vast majority of systems tested, particularly those with older or lower-tier components.

FAQ

Q: What is the best resolution for this combo in Doom?

A: At 2560x1440 with High settings, the combo averages 174.1 FPS, which balances visual quality and frame rate. At 1920x1080, frame rates exceed 266 FPS on High, but 1440p provides a better visual experience without sacrificing smoothness.

Q: How much performance is lost when moving from 1080p to 4K?

A: At High settings, the average FPS drops from 266.1 at 1080p to 174.1 at 1440p, then to 97 at 4K. This represents a 63.5% reduction from 1080p to 4K, indicating the GPU becomes increasingly stressed at higher resolutions.

Q: Which settings preset is most efficient?

A: The Medium preset at 1440p delivers 207.6 FPS, which is 19.2% higher than High settings while still providing good visual fidelity. At 4K, Medium offers 112 FPS versus 97 on High, a 15.5% improvement.

Q: Is the CPU or GPU the limiting factor?

A: The GPU is the limiting factor. At 1080p Low, the combo reaches 363.7 FPS, but at 4K Ultra it drops to 74.6 FPS. The CPU's high single-thread performance keeps frame rates high at lower resolutions, but the GPU is saturated at 4K.

Q: Does the 24 GB VRAM matter for Doom?

A: The 24 GB memory is far more than Doom requires. Even at 4K Ultra, the game does not approach this limit, so the VRAM headroom does not affect performance. The GPU's compute power is the primary performance factor.

Q: How does this combo compare to the GPU's nearest rivals?

A: The RX 7900 XTX is 0.8% faster than the RTX 4090 Mobile and 1.6% faster than the Quadro M6000, but 2% slower than the RTX 4070 Ti. These differences are small, meaning the combo's performance is representative of the GPU tier.

Resolution Scaling

The measured FPS data reveals a clear scaling pattern across resolutions. At 1080p, the combo is heavily CPU-bound at low settings, achieving 363.7 FPS, but this drops to 266.1 FPS at High and 218.8 FPS at Ultra. Moving to 1440p, the frame rates fall by roughly 26-35% depending on settings: Low goes from 363.7 to 236.1 FPS, High from 266.1 to 174.1 FPS, and Ultra from 218.8 to 143.6 FPS. The scaling continues to 4K, where Low delivers 127.7 FPS, High 97 FPS, and Ultra 74.6 FPS.

The percentage drop from 1080p to 4K is substantial: Low settings lose 64.9% of performance, High loses 63.5%, and Ultra loses 65.9%. This consistent reduction across settings indicates that the GPU is the primary bottleneck at higher resolutions. At 1080p, the CPU's strong single-thread performance allows the GPU to stretch its legs, but as pixel count increases, the GPU's rendering load dominates and frame rates scale inversely with resolution. The game is well-optimized, as the scaling is smooth and predictable, with no sudden collapses in performance.

Settings Recommendations

For the best experience, the Medium preset at 2560x1440 is the sweet spot. It delivers 207.6 FPS, which is 19.2% faster than High at the same resolution, while still maintaining smooth gameplay on high-refresh-rate monitors. At 4K, Medium offers 112 FPS, which is playable on a 120 Hz display, but High at 97 FPS is also reasonable for those prioritizing visual quality. Ultra settings provide the best image quality but at 74.6 FPS at 4K, which may be below the refresh rate of some high-end monitors.

At 1080p, even Ultra settings deliver 218.8 FPS, so users with 1080p displays can max out the game without concern. The Low preset is unnecessary for this combo, as it only yields 363.7 FPS at 1080p, which exceeds any current display's refresh rate. For most users, Medium at 1440p offers the ideal balance of frame rate and visual fidelity, while High at 4K is the best choice for those with 4K displays who want to maintain a 97 FPS average.

Measured FPS Breakdown

At 1920x1080, the combo achieves its highest frame rates: Low averages 363.7 FPS, Medium 314.5 FPS, High 266.1 FPS, and Ultra 218.8 FPS. These numbers show a consistent drop of roughly 14-27% per settings tier, with Ultra being 39.8% slower than Low. The scaling from Low to Ultra is moderate, indicating the GPU has headroom at this resolution.

At 2560x1440, performance remains high: Low delivers 236.1 FPS, Medium 207.6 FPS, High 174.1 FPS, and Ultra 143.6 FPS. The drop from Low to Ultra is 39.2%, similar to 1080p, but the absolute frame rates are lower. The difference between Medium and High is 16.1%, while High to Ultra is 17.5%, showing a consistent decline.

At 3840x2160, the GPU is fully stressed: Low averages 127.7 FPS, Medium 112 FPS, High 97 FPS, and Ultra 74.6 FPS. The drop from Low to Ultra is 41.6%, with High to Ultra being 23.1%. This is the largest relative gap between High and Ultra, confirming that Ultra settings at 4K tax the GPU heavily. Overall, the data shows that this combo can handle Doom at any resolution with playable frame rates, but the best balance of quality and speed is found at 1440p Medium or 4K High.