Doom

The AMD Ryzen 5 9600X paired with the AMD Radeon RX 6600 XT delivers a highly playable experience in Doom, though the data reveals a clear shift in system bottleneck as resolution climbs. The measured frames per second across the three tested resolutions show a predictable decline, but the magnitude of that decline is telling. At 1920x1080, the combo achieves 140.4 FPS on High settings, while the same preset at 2560x1440 drops to 91.8 FPS, a reduction of roughly 35%. Pushing to 3840x2160, the average falls further to 48.1 FPS, which is about 48% lower than the 1440p result and 66% below the 1080p figure. This steep trajectory indicates that the RX 6600 XT is the primary limiter as pixel count increases.

The scaling pattern is consistent across all settings presets. Low settings at 1080p produce 192.2 FPS, but this drops to 122.1 FPS at 1440p and 67.9 FPS at 4K. Medium settings follow the same shape: 168.1 FPS at 1080p, 106.0 FPS at 1440p, and 57.8 FPS at 4K. Ultra settings, the most demanding, start at 113.1 FPS at 1080p, fall to 78.0 FPS at 1440p, and bottom out at 40.9 FPS at 4K. The consistent proportional drop between 1440p and 4K—roughly 47-48% across all presets—suggests the GPU’s memory bandwidth and compute resources are saturated. The RX 6600 XT’s 8 GB of GDDR6 memory on a 128-bit bus, with 256.0 GB/s bandwidth, is adequate for 1080p and 1440p but becomes a constraint at 4K, where the frame rate falls below the 60 FPS threshold even on Low settings.

Resolution Scaling

The resolution scaling data indicates that the RX 6600 XT is the dominant factor in frame rate degradation from 1080p to 4K. At 1080p High, the system produces 140.4 FPS, which is well above the 100 FPS mark, demonstrating that the CPU is feeding the GPU adequately. However, when resolution doubles to 4K, the pixel count quadruples, and the GPU’s 10.60 TFLOPS of FP32 compute and 165.7 GPixel/s pixel rate are stretched thin. The 4K High result of 48.1 FPS is not just a numerical drop; it represents a shift from a GPU-bound scenario at 1080p to a heavily GPU-limited one at 4K. The fact that even Low settings at 4K only reach 67.9 FPS confirms that the GPU’s raw throughput, not the game’s visual complexity, is the wall.

The gap between Low and Ultra settings widens as resolution increases, which is another sign of GPU saturation. At 1080p, the difference between Low (192.2 FPS) and Ultra (113.1 FPS) is 79.1 FPS, a 70% performance spread. At 4K, that spread shrinks to 27.0 FPS (67.9 vs 40.9), a 66% relative difference but a smaller absolute one. This compression occurs because the GPU is already near its limit at 4K Low, leaving little headroom for additional settings to impact performance. The benchmark results indicate that the Ryzen 5 9600X, with its 6 cores and 12 threads boosting to 5.40 GHz, is not the limiting factor in this game; the frame rate declines are almost entirely attributable to the GPU’s workload.

Settings Recommendations

For the best experience per the measured rows, the Medium preset at 2560x1440 offers the most balanced outcome. It delivers 106.0 FPS, which is comfortably above the 100 FPS threshold for smooth gameplay, while maintaining a 15% improvement over High settings at the same resolution (91.8 FPS). At 1080p, Medium at 168.1 FPS is an excellent choice for high-refresh-rate monitors, as it stays close to the Low preset’s 192.2 FPS while providing better visual quality. The Ultra preset at 1080p, at 113.1 FPS, is still playable but sacrifices 55.0 FPS compared to Medium, which is a substantial penalty for marginal visual gains.

At 4K, none of the presets achieve 60 FPS, making this resolution impractical for this combo. The best 4K result is Low at 67.9 FPS, which is playable but visually compromised. High at 4K (48.1 FPS) and Ultra at 4K (40.9 FPS) fall below the smooth-playability threshold. For users targeting 1440p, the Medium preset (106.0 FPS) is the sweet spot, as it provides a 28.0 FPS advantage over Ultra (78.0 FPS) while only sacrificing a modest amount of visual fidelity. The data suggests that Medium is the optimal preset for this hardware, as it consistently outperforms High across all resolutions by 17-20% while offering a more noticeable jump from Low.

CPU Role

The AMD Ryzen 5 9600X, built on the Zen 5 architecture with a 4 nm process, has a base clock of 3.90 GHz and a boost clock of 5.40 GHz. Its 6 cores and 12 threads, along with 32 MB of shared L3 cache, are well-suited for Doom’s engine. The CPU’s single-thread performance is strong, as evidenced by its 3dmark_single_thread score of 1253 and passmark_single_thread score of 4570. In a game like Doom, which is known for its efficient multi-threading but also relies on strong single-core performance for game logic, this CPU provides ample headroom. The 1080p results show that the CPU is not a bottleneck: at Low settings, the system hits 192.2 FPS, which is near the upper limit of what many displays can show, indicating the GPU is the limiting factor even at lower resolutions.

The CPU’s multi-threaded capabilities, reflected in a cinebench_r23_multicore score of 25525, are more than sufficient for Doom’s rendering threads. The 3dmark_8_threads score of 6726 and 3dmark_max_threads score of 7590 show that the processor scales well with workload, but the game does not appear to push the CPU to its limits. The data shows that as resolution increases, the frame rate drops proportionally, which would not happen if the CPU were the bottleneck. If the 9600X were the limiting factor, the 1080p and 1440p results would be closer together. Instead, the 4K results are significantly lower, confirming that the GPU’s 8 GB memory and 256.0 GB/s bandwidth are the constraints. The CPU’s 89.6 GB/s memory bandwidth and DDR5 support are not stressed in this scenario.

How This Combo Ranks

In the global database of tested combinations, this pairing of the Ryzen 5 9600X and RX 6600 XT ranks 1238 out of 1681 combos for Doom. This places it in the 26th percentile of all tested systems, meaning roughly three-quarters of combinations deliver higher frame rates. This ranking is expected given the GPU’s mid-range positioning. The RX 6600 XT has an average benchmark score of 27985, which places it in the 71st percentile of all GPUs. Its nearest rivals include the NVIDIA GeForce GTX 980 Ti, which has an average score of 27956 and a deltaPct of 0.1%, meaning the RX 6600 XT is essentially tied with that older flagship. The RX 6600 XT also sits 0.9% behind the NVIDIA GeForce RTX 3070 (avg score 28238) and 1.5% ahead of the AMD FirePro S7150 (avg score 28409).

The CPU’s ranking is more favorable. The Ryzen 5 9600X has an average benchmark score of 28246, placing it in the 85th percentile of all CPUs. Its nearest rivals include the Intel Core i5-13490F, which scores 28173 (a 0.3% delta), and the AMD Ryzen 5 230, which scores 28164 (also a 0.3% delta). The CPU is 0.4% behind the AMD Ryzen 7 8845HS (28369) and 0.5% behind the Intel Core i5-14500T (28377). This indicates that the CPU is a strong performer, but the combo’s overall rank is dragged down by the GPU. The data suggests that the RX 6600 XT is the weak link in this pairing for Doom, as its raw compute (10.60 TFLOPS) and pixel rate (165.7 GPixel/s) are not sufficient to push frame rates higher, especially at 1440p and above.

GPU Role

The AMD Radeon RX 6600 XT, based on the RDNA 2.0 architecture with a 7 nm process, has a base clock of 1968 MHz, a game clock of 2359 MHz, and a boost clock of 2589 MHz. Its 2048 shading units, 128 TMUs, and 64 ROPs provide a solid foundation for 1080p gaming. The 8 GB of GDDR6 memory on a 128-bit bus delivers 256.0 GB/s of bandwidth, which is the key constraint at higher resolutions. The GPU’s performance in Doom is directly tied to this bandwidth: at 1080p, the memory subsystem can keep up with the rendering pipeline, but at 4K, the 256.0 GB/s bandwidth becomes a limiting factor.

The GPU’s benchmark scores reflect its mid-range positioning. It achieves a passmark_g3d score of 16461 and a 3dmark_steel_nomad_dx12 score of 1804, placing it in the 71st percentile of all GPUs. Its nearest rival, the NVIDIA GeForce GTX 980 Ti, has a nearly identical average score (27956 vs 27985, a 0.1% delta), which shows that the RX 6600 XT offers performance comparable to a high-end card from a previous generation. However, in Doom specifically, the GPU’s 8 GB memory capacity is not the issue—the bandwidth is. The measured FPS at 4K High (48.1) and 4K Ultra (40.9) are well below the 60 FPS target, and even the 4K Low result (67.9) is only marginally above it. This indicates that the GPU is operating at its computational limits when handling 8.3 million pixels per frame.

The GPU’s 160 W TDP and dual-slot design are typical for this class, and its PCIe 4.0 x8 interface provides sufficient bandwidth for the card. The data shows that the RX 6600 XT is capable of delivering high frame rates at 1080p, with all presets exceeding 113 FPS, but its performance degrades sharply at 1440p and 4K. For Doom, the GPU is the decisive component, and users seeking higher resolutions would need a more powerful card. The 256.0 GB/s bandwidth and 10.60 TFLOPS of FP32 compute are the defining specifications that limit this combo to 1080p and entry-level 1440p gaming.