Doom

The AMD Ryzen 9 7900X paired with the AMD Radeon RX 6650 XT delivers a robust 1080p experience in Doom, but the data reveals a significant shift in bottleneck behavior as resolution climbs. At 1920x1080, the system achieves 199 FPS on Low settings, while the Ultra preset still maintains 118.9 FPS, indicating that the CPU’s 12 cores and 24 threads are providing ample headroom for the GPU to stretch its legs. The processor’s base clock of 4.70 GHz and boost clock of 5.60 GHz, combined with its Zen 4 architecture, place it in the 93rd percentile of all CPUs, yet the benchmark results suggest that even this powerful chip is not the limiting factor at lower resolutions. The question becomes whether the RX 6650 XT’s 8 GB of GDDR6 memory and 128-bit bus width can sustain these frame rates when the workload shifts to higher pixel counts.

CPU Role — cores, clocks, and how they relate to this game's results

The Ryzen 9 7900X brings substantial processing power to this pairing, with 12 cores and 24 threads operating at a base clock of 4.70 GHz and a boost clock of 5.60 GHz. This configuration, built on the 5 nm TSMC process with 13,140 million transistors, delivers a Cinebench R23 multicore score of 43695 and a single-core score of 6168, placing it in the 93rd percentile against all CPUs. The processor’s nearest rivals, including the Intel Core Ultra 5 235 and AMD Ryzen 9 5900XT, show average benchmark scores within 0.1% to 0.8% of the 7900X, meaning the performance delta between these chips is negligible in synthetic tests. However, in Doom, the CPU’s role appears secondary; at 1080p Low, the system pushes 199 FPS, which is a 36.9% increase over the Ultra preset’s 118.9 FPS. This scaling pattern suggests that the game’s engine is well-optimized for the 7900X’s thread count, but the frame rate ceiling is more likely dictated by the GPU’s rendering capabilities than the CPU’s raw compute. The 7900X’s 64 MB of shared L3 cache and dual-channel DDR5 memory support further reduce any potential stutter, but the measured data does not show a scenario where the CPU becomes a bottleneck, even at 4K Ultra where the average FPS drops to 44.

GPU Role — VRAM, clocks, and how they relate to this game's results

The Radeon RX 6650 XT is the workhorse in this equation, featuring 8 GB of GDDR6 memory on a 128-bit bus with a bandwidth of 280.3 GB/s. Its base clock of 2055 MHz and boost clock of 2635 MHz, alongside 2048 shading units and 64 ROPs, produce a pixel rate of 168.6 GPixel/s and a texture rate of 337.3 GTexel/s. The GPU’s passmark G3D score of 17166 places it in the 72nd percentile of all GPUs, with nearest rivals like the AMD Radeon RX 6800M showing a 0% delta in average score, indicating near-identical performance. In Doom, the GPU’s influence is most apparent when comparing settings at the same resolution; at 1440p, the jump from Low (130 FPS) to Ultra (80.2 FPS) represents a 38.3% reduction in frame rate, which is a direct consequence of increased pixel shading and texture work. The 8 GB VRAM capacity appears sufficient for this title, as even at 4K Ultra, the average FPS of 44 does not suggest memory swapping, but rather a raw compute limit. The GPU’s FP32 throughput of 10.79 TFLOPS is the decisive factor here, and the data shows that the RX 6650 XT struggles to maintain playable frame rates at 4K Ultra, where the 44 FPS average falls below the 60 FPS threshold typically desired for a fast-paced FPS.

Resolution Scaling — how FPS drops from 1080p to 4K and what it says about the limiting component

Examining the FPS drop from 1080p to 4K reveals a clear pattern of GPU-bound performance. At High settings, the average FPS falls from 145.4 at 1080p to 94 at 1440p, then to 54.8 at 4K—a cumulative drop of 62.3% from the starting point. The Low preset tells a similar story, with 199 FPS at 1080p dropping to 130 at 1440p and 70.5 at 4K, representing a 64.6% decline. This scaling is not linear, which is typical for a GPU-bound scenario; the pixel count increases by 2.25 times from 1080p to 1440p, yet the FPS drop is only 34.7% at High settings, suggesting some headroom in the GPU’s architecture. However, the jump from 1440p to 4K quadruples the pixel count, and the frame rate drops by 41.7% at High settings, indicating that the RX 6650 XT’s memory bandwidth and compute units are being saturated. The fact that the CPU’s performance remains constant across resolutions—since the 7900X’s workload does not scale with pixel count—confirms that the GPU is the limiting component at 4K. The data implies that players targeting 4K should stick to Low or Medium settings, where the average FPS of 70.5 and 60.2, respectively, are more acceptable, though still not ideal for competitive play.

FAQ

Q: What is the best resolution for this combo to maintain a 60 FPS average in Doom?

A: The data shows that 1440p Ultra yields an average FPS of 80.2, while 4K High drops to 54.8. For a consistent 60 FPS, 1440p with High or Ultra settings is the safest choice, as 4K requires Low (70.5 FPS) or Medium (60.2 FPS) settings to stay above the threshold.

Q: How does the Ryzen 9 7900X’s single-thread performance impact Doom’s frame rates?

A: The processor’s Cinebench R23 single-core score of 6168 and 3dmark single-thread score of 1093 indicate strong per-core performance. Since Doom is a fast-paced FPS that benefits from high IPC, this ensures the CPU does not bottleneck the GPU at lower resolutions, as evidenced by the 199 FPS result at 1080p Low.

Q: Is the RX 6650 XT’s 8 GB VRAM sufficient for Ultra settings at 1440p?

A: Yes, the 80.2 FPS average at 1440p Ultra suggests that the 8 GB memory is not exhausted, as the frame rate remains high. The bottleneck is more likely the GPU’s compute throughput, not memory capacity, since the game’s textures at this resolution fit within the VRAM budget.

Q: What is the performance gap between Low and Ultra settings at 1080p?

A: At 1080p, Low settings yield 199 FPS, while Ultra drops to 118.9 FPS. This represents a 40.3% reduction in frame rate, which is significant for competitive players who may prefer lower settings to maximize refresh rate compatibility.

Q: How does this combo rank among all tested configurations?

A: The combo ranks 1073 out of 1681 tested combos, placing it in the lower-middle tier. This ranking reflects the GPU’s mid-range status, as the CPU’s high percentile (93rd) does not compensate for the GPU’s 72nd percentile standing in overall system performance.

Q: Can the GPU handle 4K gaming in Doom?

A: Yes, but with caveats. At 4K Low, the average FPS is 70.5, which is playable, and at 4K Medium it drops to 60.2. However, 4K High (54.8 FPS) and Ultra (44 FPS) fall below the 60 FPS target, so players must compromise on settings to achieve smooth gameplay.

Settings Recommendations

Based on the measured FPS data, the optimal settings depend on the player’s resolution and frame rate preference. For 1080p, the High preset offers a strong balance at 145.4 FPS, which is well above the 144 Hz refresh rate found on many monitors, while Ultra at 118.9 FPS still provides a smooth experience for most users. The Low preset at 199 FPS is the best choice for competitive players seeking maximum responsiveness, but the visual fidelity loss may be unnecessary given the GPU’s headroom. At 1440p, the High preset at 94 FPS is the sweet spot, as it maintains a high frame rate without sacrificing too much quality, whereas Ultra at 80.2 FPS is acceptable for those prioritizing visuals. For 4K, the Low preset at 70.5 FPS is the only setting that comfortably exceeds 60 FPS, making it the recommended choice for playable performance; Medium at 60.2 FPS is borderline, and High or Ultra should be avoided due to sub-60 FPS averages. The data suggests that the GPU is the limiting factor at higher resolutions, so players should prioritize lower settings at 4K to maintain fluidity.

Measured FPS Breakdown

At 1920x1080, the system delivers an average FPS of 199 on Low, 173.6 on Medium, 145.4 on High, and 118.9 on Ultra. Moving to 2560x1440, the averages are 130 on Low, 113.3 on Medium, 94 on High, and 80.2 on Ultra. At 3840x2160, the averages fall to 70.5 on Low, 60.2 on Medium, 54.8 on High, and 44 on Ultra. The progression shows a consistent pattern: each settings tier at a given resolution costs approximately 10-20% performance, while each resolution increase from 1080p to 1440p costs roughly 30-35% performance across all settings. The 4K jump is more punishing, with a 45-50% drop from 1440p depending on the preset. The largest single drop occurs from 1080p Ultra to 1440p Ultra, where the frame rate falls 32.6%, while the smallest relative drop is from 1440p Low to 4K Low, at 45.8%—indicating the GPU’s memory bandwidth is stretched thin at the highest pixel counts.

How This Combo Ranks

The combination of the Ryzen 9 7900X and RX 6650 XT achieves a combo rank of 1073 out of 1681 tested configurations, placing it in the 36th percentile of all combos. This ranking is somewhat surprising given the CPU’s high standing (93rd percentile) and the GPU’s solid mid-range position (72nd percentile). The disparity suggests that the GPU’s performance ceiling is the primary constraint, as the CPU is unlikely to bottleneck any modern title at these settings. The nearest CPU rivals, such as the Intel Core i9-13980HX with a 0.8% lower average score, would likely yield similar in-game results when paired with the same GPU, since the frame rates observed are GPU-limited. Conversely, the GPU’s nearest rivals, like the AMD Radeon RX 6800M with a 0% delta, would produce nearly identical performance in Doom, confirming that this combo’s ranking is driven by the graphics card’s capabilities rather than the processor. The data implies that upgrading the GPU would provide a more significant FPS boost than upgrading the CPU, especially at 1440p and 4K where the RX 6650 XT is clearly the limiting factor.