Doom

The combination of an AMD Ryzen 9 7900X and an AMD Radeon RX 580 in Doom is a textbook case of GPU-bound performance collapse: the CPU is so far ahead of the graphics board that every resolution and preset played is governed almost entirely by the Polaris 20 GPU. Measured frame rates drop steadily from 1080p through 1440p to 4K, and even at the lowest settings the 4K average rarely reaches a smooth 60 frames per second. While the CPU's 12-core Zen 4 powerhouse (boost clock 5.60 GHz, 24 threads) could easily push a far smaller GPU to its limits, the RX 580's 8 GB of GDDR5 and 256-bit bus put a hard ceiling on the experience. The data set here is measured, not estimated, so the following numbers carry direct empirical weight.

Resolution Scaling

The measured FPS table records clear, monotonic drops as resolution climbs, which is the fingerprint of a GPU-limited system. On the High preset, the average at 1920x1080 is 75 FPS, falling to 49 FPS at 2560x1440 and to 26 FPS at 3840x2160. That is a loss of more than two-thirds of the 1080p starting frame rate when moving to 4K. Low preset follows the same shape: 102 FPS → 66 FPS → 36 FPS. Medium goes 89 → 58 → 31; Ultra goes 62 → 40 → 22. So the GPU's rendering power decays roughly in line with the number of pixels, and the gap between 1440p and 4K is consistently larger than the gap between 1080p and 1440p, again pointing to raw throughput constraints rather than any CPU bottleneck.

At 1080p Low, the combo manages 102 FPS, which is fluid for competitive play. But even at 1080p Ultra, that number falls to 62 FPS. The divide between Low and Ultra at 1080p is 40 FPS (102 vs 62). At 1440p the spread narrows to 26 FPS (66 vs 40), and at 4K the spread is only 14 FPS (36 vs 22). What this indicates is that the GPU approaches its saturation point as detail settings rise, leaving settings changes less impactful once the GPU is already maxed out. The pattern matches the RX 580’s position: it has only 32 ROPs and 6.175 TFLOPS of FP32 performance, which are far below what the CPU could offload.

Because the CPU is so far ahead, the data strongly suggests that the RX 580 is the decisive component. No CPU-side factor such as L3 cache size or memory bandwidth can alter this trend; the curve is effectively flat across presets when normalized to resolution. The only deviation is in the minimum FPS values recorded at Medium: 4K shows 27 FPS minimum, 1440p shows 49, 1080p shows 76. These minimums hint that even at Medium the GPU stutters at high resolutions, but the averages reveal the bigger story of steep scaling.

GPU Role

The RX 580 is a graphics card from the Polaris 20 chip, built on the 14 nm process, with a base clock of 1257 MHz and boost clock of 1340 MHz. It has 2304 shading units, 144 texture mapping units, and 32 ROPs. Its effective GPU memory clock is 2000 MHz, which yields 8 Gbps effective and a measured memory bandwidth of 256.0 GB/s. This bandwidth figure, combined with a 256-bit bus, appears to be the primary constraint in Doom at high resolutions: at 4K the GPU needs to stream far more per megapixel, and the 256.0 GB/s pipe is insufficient. The GPU's own benchmark scores (PassMark G3D 8813, average benchmark 12928) place it at the 53rd percentile of all GPUs on the site’s database. That is a mid‑pack position, far below the CPU's 91st percentile.

The CPU, in contrast, packs a 64 MB L3 cache, dual-channel DDR5 memory support (83.2 GB/s), and a motherboard PCIe Gen 5. Although these specs maximize system memory speed, they do not translate into measurable FPS gains in Doom once the RX 580 is the bottleneck. The data shows no scenario where the CPU becomes a limitation: the CPU never dips below its capable frame window in any resolution, as evidenced by the fact that even at 1080p Low, which typically stresses the CPU the most, the combo still produces 102 FPS, far beyond what the GPU could push at 4K. The game’s minimum FPS values (only available for Medium ranges) are all ≥ 27, and they get lower as resolution increases, proving that the GPU is the primary frame limiter, not the CPU's 12 cores.

At the core of the GPU role is the pixel fill rate of 42.88 Gigapixels/s and texture rate of 193.0 GTexel/s. In Doom, where the game is often heavy on particle and geometry, these numbers are the ones doing the work. The 56.5 TFLOPS of FP32 shader compute may help in shader-heavy scenes, but the frame declines are too linear with resolution to be CPU limited. The GPU is an end-of-life product (launch MSRP 229 USD), and the CDP (combo depth per frame) remains a constant.

FAQ

Q: What is the measured average FPS at 1920x1080 on Ultra?

A: The average is 62 frames per second, with no minimum or maximum recorded.

Q: Does the system ever reach 60 FPS at 4K?

A: No. The highest 4K average is 36 FPS, which occurs at Low settings. At Medium it is 31, High is 26, and Ultra is 22.

Q: What is the lowest minimum FPS recorded in the measured data?

A: The lowest minimum is 27 FPS – but this is only available for Medium at 3840x2160. (The High and Ultra at 4K lack min values, so this minimum is from Medium.)

Q: How does the CPU’s benchmark standing compare to the GPU’s?

A: The CPU ranks in the 91st percentile of all CPUs, while the GPU sits in the 53rd percentile of all GPUs. The measured CPU average score is 53288, with its nearest rivals including the EPYC 7313P and Xeon Phi 7290; the GPU’s average score 12928 puts it alongside the GTX 1660 SUPER and Radeon 740M in the chart.

Q: How much video memory does the RX 580 have?

A: It has 8 GB of GDDR5 on a 256-bit bus, with a memory clock of 2000 MHz (effective 8 Gbps) and a memory bandwidth of 256.0 GB/s.

Measurement FPS Breakdown

| Resolution | Settings | Avg FPS | Min FPS | Max FPS |

|------------|----------|---------|---------|---------|

| 3840x2160 | High | 26 | N/A | N/A |

| 3840x2160 | Low | 36 | N/A | N/A |

| 3840x2160 | Medium | 31 | 27 | 36 |

| 3840x2160 | Ultra | 22 | N/A | N/A |

| 2560x1440 | High | 49 | N/A | N/A |

| 2560x1440 | Low | 66 | N/A | N/A |

| 2560x1440 | Medium | 58 | 49 | 66 |

| 2560x1440 | Ultra | 40 | N/A | N/A |

| 1920x1080 | High | 75 | N/A | N/A |

| 1920x1080 | Low | 102 | N/A | N/A |

| 1920x1080 | Medium | 89 | 76 | 103 |

| 1480x1080 | Ultra | 62 | N/A | N/A |

The table shows the complete set. Note that only the Medium setting at each resolution has both minimum and maximum values, while the others omit them. Among these, the peak average is 102 FPS (1080p Low) and the peak 1080p Ultra (62) is only slightly above the 4K 36 Low. The strongest contrast is the gap between 1080p Low and 4K Ultra (102 vs 22), a 4.6‑fold drop that is too large for any CPU‑bound factor.

How This Combo Ranks

This combination on this game ranks at number 3397 out of a total of 3712 tested combos in the database. That places it in the lowest 8% of all combos for Doom. The ranking is a direct consequence of the GPU’s age and the engine’s scaling: since the CPU is in the 91st percentile, there is no CPU overhead to blame. The measured data sets it apart from other systems that pair similar CPUs with modern GPUs. The GPU’s 53rd percentile put this build well below the median performer for resolution-intensive scenes.

The combo’s rank also holds value as a baseline: a GPU with a launch of 229 USD and 4.6 GB/s memory (but actually 256 GB/s) – the RX 580 – cannot keep pace with even a low‑end modern GPU. Compare the measured More than 60 FPS at 4K, this system fails to, yet it retains some playability on Low at 4K (36 FPS). The rank is the story: the processor is not the limiting component, and the GPU is.

Settings Recommendations

The measured FPS values point to a clear recommendation: keep the resolution of the game at 1920x1080 for regular, high-frequency play. At 1080p, every preset except Ultra breaks 50 FPS. Low (102), Medium (89), High (75) are all pleasant north of the 60 FPS threshold; Ultra still lands at 62, so it won't compromise play. The only given preset that fails under 60 is Ultra at 4K (22) and 1440p Ultra (40), but at 1080p Ultra still gives 62. So the best experience at 1080p is Ultra, since 62 is above the smooth threshold.

At 2560x1440, only Low (66) stays above 60; Medium is close (58), but High and Ultra are below the 60 mark. If a player prefers the sharper visuals, the if you can tolerate 58–66, Medium or if you want 60+ then Low. However, those looking for stable 60 at 1440p should drop resolution or accept less detail per the data. At 4K nothing achieves 60; only 36 FPS is available with Low, so to reach 30 FPS at this resolution you must stay with Low. The thorough 4K at High or Ultra comes down at 26 and 22, which are unplayable for any demanding user.

Thus the recommended approach is: If you have a 1080p monitor, use the High or Medium preset (depending on whether you want a cleaner 75 FPS or a more headroom 89 FPS), and the Ultra is fine at 62. At 1440p use only Low for full smoothness or Medium for a slightly lower but still acceptable frame rate (58). At 4K, the game is only approachable only with Low because any preset loses the 30 FPS target. In all cases, the CPU stays idle above the frame target; the bottleneck remains the RX 580’s silicon, and the decision of preset is simply how much detail one can trade for speed.