Doom

The AMD Ryzen 9 7900X paired with the AMD Radeon RX 6600 XT delivers a highly capable 1080p and 1440p experience in Doom, but the data clearly shows that the GPU becomes the definitive limiting factor as resolution increases. The scaling pattern from 1080p to 4K is steep, revealing a component balance that favors high-refresh-rate gaming at lower resolutions over 4K viability.

Resolution Scaling

The measured frame rates demonstrate a predictable and steep decline as resolution climbs from 1920x1080 to 3840x2160. At High settings, the average FPS drops from 142.3 at 1080p to 93.3 at 1440p, a reduction of 49 FPS, and then plummets to 47.7 at 4K. This represents a 66.5% drop in performance from 1080p to 4K at the same settings, indicating that the rendering workload expands dramatically with pixel count.

The scaling pattern is consistent across all settings presets. At Low settings, the average FPS falls from 194.7 at 1080p to 122.6 at 1440p, and finally to 67.2 at 4K. The Medium preset shows a similar trajectory: 168.4 at 1080p, 110.5 at 1440p, and 59.3 at 4K. The Ultra preset, being the most demanding, scales from 114 at 1080p to 74.9 at 1440p and 39.7 at 4K.

The magnitude of these drops points directly to the GPU as the bottleneck. The Ryzen 9 7900X, with its 12 cores and 24 threads, is more than capable of feeding frames at any of these resolutions. The fact that 4K High yields just 47.7 FPS while 1080p High produces 142.3 FPS suggests the RX 6600 XT's 8 GB of GDDR6 memory and 256.0 GB/s bandwidth are saturated by the higher pixel throughput, rather than the CPU's processing capacity being exhausted.

GPU Role

The AMD Radeon RX 6600 XT is built on the RDNA 2.0 architecture with a Navi 23 chip, featuring 2048 shading units, 128 texture mapping units, and 64 raster output units. Its boost clock reaches 2589 MHz, with a game clock of 2359 MHz and a base clock of 1968 MHz. The memory configuration consists of 8 GB of GDDR6 on a 128-bit bus, providing 256.0 GB/s of bandwidth.

The GPU's FP32 performance of 10.60 TFLOPS and texture rate of 331.4 GTexel/s are directly relevant to Doom's fast-paced rendering demands. The pixel rate of 165.7 GPixel/s becomes the limiting factor at 4K, where the sheer number of pixels to fill overwhelms the 64 ROPs. This explains why the 4K results hover between 39.7 FPS on Ultra and 67.2 FPS on Low—the GPU simply cannot maintain higher throughput at that pixel density.

The RX 6600 XT's benchmark percentile of 71 versus all GPUs places it in the upper-middle tier, with an average benchmark score of 27985. Its nearest rivals include the NVIDIA GeForce GTX 980 Ti with a deltaPct of 0.1, and the NVIDIA GeForce RTX 3070 with a deltaPct of -0.9, indicating performance parity with the former and a slight deficit against the latter. In Doom specifically, the 4K Ultra result of 39.7 FPS confirms this GPU is not designed for 4K gaming at maximum settings.

How This Combo Ranks

The combination of the Ryzen 9 7900X and RX 6600 XT ranks 1183 out of 1681 tested combos in Doom, placing it in the 70th percentile of all combinations. This ranking is heavily influenced by the GPU's limitations, as the CPU's individual percentile of 93 versus all CPUs is significantly higher than the GPU's 71.

The data indicates that this combo is held back by the RX 6600 XT. The Ryzen 9 7900X's nearest CPU rivals, such as the Intel Core Ultra 5 235 with a deltaPct of -0.1 and the AMD Ryzen 9 5900XT with a deltaPct of -0.4, all exhibit nearly identical average scores, confirming the CPU is performing at its expected level. However, the GPU's mid-tier standing means the overall combo ranking suffers relative to what the CPU alone could achieve with a more powerful graphics card.

The rank of 1183 out of 1681 indicates that while this combo is not at the bottom, it is firmly in the lower half of tested configurations for Doom. This is a direct consequence of pairing a top-tier CPU with a mid-range GPU, creating a system that excels in CPU-bound scenarios but struggles when the GPU becomes the constraint.

Measured FPS Breakdown

At 1920x1080, the combo delivers excellent performance across all settings. Low settings produce an average of 194.7 FPS, Medium achieves 168.4 FPS, High reaches 142.3 FPS, and Ultra bottoms out at 114 FPS. All of these figures are well above the 60 FPS threshold, and the 1080p Ultra result of 114 FPS demonstrates that even the most demanding preset is playable at high refresh rates.

Moving to 2560x1440, the frame rates remain strong but show the GPU's growing strain. Low settings yield 122.6 FPS, Medium drops to 110.5 FPS, High achieves 93.3 FPS, and Ultra falls to 74.9 FPS. The 1440p Ultra result is still above 60 FPS, making this resolution viable for competitive play, though the margin narrows considerably.

At 3840x2160, the GPU's limitations become apparent. Low settings produce 67.2 FPS, which is barely above the 60 FPS mark. Medium settings drop to 59.3 FPS, High falls to 47.7 FPS, and Ultra plummets to 39.7 FPS. These numbers indicate that 4K gaming is only feasible at Low settings, and even then, the margin is thin.

CPU Role

The AMD Ryzen 9 7900X is a 12-core, 24-thread processor based on the Zen 4 architecture with a 5 nm process node. Its base clock is 4.70 GHz, and it boosts to 5.60 GHz. The CPU features 64 MB of shared L3 cache and 1 MB of L2 cache per core, with a 64 KB L1 cache per core.

In CPU-bound benchmarks, the 7900X demonstrates exceptional performance. Its Cinebench R23 multicore score of 43695 and single-core score of 6168 place it in the top tier of processors. The Geekbench multicore score of 17830 and single-core score of 2952 further confirm its high-end status. The Passmark multithread score of 51406 and single-thread score of 4238 reinforce this assessment.

The CPU's benchmark percentile of 93 versus all CPUs, with an average benchmark score of 50556, shows it is significantly above average. Its nearest rivals—the Intel Core Ultra 5 235, AMD Ryzen 9 5900XT, Intel Core i7-13850HX, and Intel Core i9-13980HX—all have deltaPct values between -0.1 and -0.8, meaning the 7900X performs within 1% of these alternatives. In Doom, the CPU's role is to feed the GPU with frame data, and given the high frame rates observed at 1080p (up to 194.7 FPS), the CPU is clearly not a bottleneck.

FAQ

Q: Is this combo suitable for 4K gaming in Doom?

A: The data shows 4K performance is marginal. At 4K Low settings, the average FPS is 67.2, but High settings drop to 47.7 FPS and Ultra to 39.7 FPS. Only Low settings at 4K approach playable frame rates.

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

A: The 1920x1080 results are uniformly strong, with all settings producing average FPS above 114. The 2560x1440 results are also playable, with Ultra settings achieving 74.9 FPS. 4K is not recommended beyond Low settings.

Q: How does the CPU compare to its nearest rivals?

A: The Ryzen 9 7900X has an average benchmark score of 50556, with its nearest rival, the Intel Core Ultra 5 235, scoring 50598 with a deltaPct of -0.1. The AMD Ryzen 9 5900XT scores 50738 with a deltaPct of -0.4, indicating the 7900X is statistically tied with these alternatives.

Q: How does the GPU compare to its nearest rivals?

A: The RX 6600 XT has an average benchmark score of 27985. The NVIDIA GeForce GTX 980 Ti scores 27956 with a deltaPct of 0.1, while the NVIDIA GeForce RTX 3070 scores 28238 with a deltaPct of -0.9, showing the RX 6600 XT performs near the GTX 980 Ti and slightly below the RTX 3070.

Q: What is the combo's overall ranking in Doom?

A: The combo ranks 1183 out of 1681 tested combinations, placing it in the lower half of all tested configurations for this game. This ranking reflects the GPU's mid-tier performance relative to the CPU's top-tier capabilities.

Q: Does the CPU bottleneck the GPU at any resolution?

A: At 1080p Low, the combo achieves 194.7 FPS, which suggests the CPU is not limiting performance. The steep FPS drops at higher resolutions indicate the GPU becomes the limiting component, not the CPU.

Settings Recommendations

For 1920x1080 gaming, the Ultra preset is the clear choice. The measured 114 FPS average at Ultra settings is well above the 60 FPS threshold and provides the best visual quality without sacrificing smoothness. Players prioritizing maximum frame rates can opt for Low settings at 194.7 FPS, but the visual compromise is substantial for a marginal gain over the Medium preset's 168.4 FPS.

At 2560x1440, the High preset offers the best balance. The 93.3 FPS average is above 60 FPS and provides a significant visual upgrade over Medium's 110.5 FPS, which is only 17.2 FPS faster. Ultra at 74.9 FPS is also viable, but the drop from High to Ultra is 18.4 FPS, making High the more sensible choice for consistent performance.

For 3840x2160, the Low preset is the only recommended option. The 67.2 FPS average is just above the 60 FPS threshold, while Medium drops to 59.3 FPS, High to 47.7 FPS, and Ultra to 39.7 FPS. The visual improvements from Low to Medium are not worth the 7.9 FPS loss, and higher presets become increasingly unplayable. Users seeking higher 4K quality should consider a more powerful GPU, as this combo's 4K Ultra result of 39.7 FPS is well below the playable threshold.