Doom

The AMD Ryzen 5 2600 paired with the AMD Radeon RX 7900 XTX delivers a remarkably consistent experience in Doom, but the data reveals a clear bottleneck dynamic. At 1080p, the combination is heavily CPU-limited, with frame rates compressing into a tight band across all settings. At 4K, the GPU takes over, and the performance gap between presets widens dramatically. The average FPS figures show this system is exceptionally capable of high-refresh-rate play at 1440p and solid 4K performance, but the aging six-core CPU prevents the flagship GPU from stretching its legs at lower resolutions.

Resolution Scaling

The scaling pattern from 1080p to 4K is the defining characteristic of this pairing. At 1080p High, the system produces 207.8 FPS, but moving to 1440p High only drops that to 173.8 FPS—a modest 16.4% reduction that suggests the CPU is the limiting factor at both resolutions. Jumping to 4K High, the frame rate falls to 97 FPS, a 44.2% drop from 1440p that finally shows the GPU being pushed. The same pattern holds across all settings: 1080p to 1440p produces relatively small gaps, while 1440p to 4K produces steep declines.

The Low preset illustrates this most clearly. At 1080p Low, the system hits 236.4 FPS; at 1440p Low, it manages 205.4 FPS; and at 4K Low, it falls to 127.4 FPS. The 1080p-to-1440p delta is only 13.1%, while the 1440p-to-4K delta is 38.0%. This indicates that even at Low settings, the CPU cannot feed the RX 7900 XTX enough frames at 1080p to differentiate itself from 1440p. The GPU's 24 GB of VRAM and 960.0 GB/s of bandwidth are ample for any scenario here, but the Ryzen 5 2600's 3.90 GHz boost clock and six cores create a ceiling that only 4K resolution can break through.

At Ultra settings, the pattern shifts slightly. The 1080p Ultra score of 195 FPS drops to 140.9 FPS at 1440p (a 27.7% reduction) and then to 78.5 FPS at 4K (a 44.3% reduction from 1440p). The Ultra preset's heavier shading load begins to engage the GPU more at 1440p, but 4K remains the only resolution where the RX 7900 XTX is clearly the dominant constraint.

Settings Recommendations

The measured data points to Ultra as the optimal preset for most users, with an important caveat at 4K. At 1440p Ultra, the system delivers 140.9 FPS, which is only 18.9% lower than High's 173.8 FPS. Given that Ultra typically includes the most demanding visual effects, this is a strong trade-off. At 1080p Ultra, the 195 FPS result is within 6.2% of the High preset's 207.8 FPS, making Ultra essentially free at that resolution—the CPU bottleneck negates any meaningful difference.

At 4K, the recommendation flips. Ultra produces 78.5 FPS, which is below the 97 FPS of High and the 112.5 FPS of Medium. For a fast-paced FPS, the 78.5 FPS average is playable but not ideal for competitive scenarios. High at 4K offers a 23.6% improvement over Ultra, and Medium offers a 43.3% improvement over Ultra. Given that the data shows no minimum FPS values, the average scores alone suggest High is the sweet spot at 4K: it maintains a comfortable margin above 60 FPS while retaining more visual fidelity than Medium.

The Low preset is rarely worth considering. At 1080p Low, the 236.4 FPS result is only 21.3% higher than Ultra's 195 FPS, and that gap narrows to 13.7% at 1440p (205.4 vs. 140.9 for Low vs. Ultra, actually a 45.8% gap—correction: the data shows 205.4 vs. 140.9, so Low is 45.8% higher). At 4K, Low's 127.4 FPS is 62.3% higher than Ultra's 78.5 FPS, but the visual cost is severe. The Medium preset at 4K, with 112.5 FPS, appears to be the best balance if frame rate is the priority over image quality.

How This Combo Ranks

The AMD Ryzen 5 2600 and AMD Radeon RX 7900 XTX combination ranks 491st out of 1,681 tested combos in Doom. This places it in the top 29.2% of all pairings, which is respectable but not elite. The ranking reflects the mismatch between the CPU and GPU: the RX 7900 XTX sits in the 85th percentile of all GPUs, while the Ryzen 5 2600 sits in the 77th percentile of all CPUs. The combo's performance is dragged down by the CPU's inability to fully utilize the GPU at lower resolutions.

The GPU's nearest rivals provide context. The RX 7900 XTX has an average benchmark score of 44,019, which is 0.4% below the AMD Radeon Pro 580 (44,195) and 0.8% above the NVIDIA GeForce RTX 4090 Mobile (43,667). The CPU's nearest rivals show similar clustering: the Ryzen 5 2600's average score of 19,616 is 0.6% above the AMD Ryzen 5 7530U (19,508) and 0.7% above the Intel Core i7-10700F (19,485). The combination of a top-tier GPU with a mid-range CPU places this combo in the upper quartile of all tested systems, but it is far from the top, where newer processors would allow the GPU to perform closer to its potential.

Measured FPS Breakdown

The complete dataset shows consistent progression across settings and resolutions. At 1920x1080, the average FPS for Low, Medium, High, and Ultra are 236.4, 222.7, 207.8, and 195, respectively. The spread from Low to Ultra is 41.4 FPS, or 17.5% of the Low score. At 2560x1440, the same settings produce 205.4, 193.6, 173.8, and 140.9 FPS. The spread here is 64.5 FPS, or 31.4% of Low. At 3840x2160, the scores are 127.4, 112.5, 97, and 78.5 FPS, with a spread of 48.9 FPS, or 38.4% of Low.

The 1080p data reveals that the CPU is the primary constraint: even dropping from Ultra to Low only yields a 21.3% improvement. At 1440p, the GPU begins to matter more, as the Ultra preset falls 31.4% behind Low. At 4K, the GPU is fully engaged, and the Ultra preset's 78.5 FPS is 62.3% lower than Low's 127.4 FPS. This gradient—from CPU-bound at 1080p to GPU-bound at 4K—is typical for a pairing where the GPU's raw power vastly exceeds what a 2018-era six-core processor can feed.

FAQ

Q: Is this combo capable of 4K gaming in Doom?

A: Yes, but with reservations. At 4K High, the average FPS is 97, and at Medium it is 112.5. Ultra drops to 78.5 FPS, which may be too low for competitive play.

Q: Why is the 1080p performance so close across all settings?

A: The Ryzen 5 2600's six cores and 12 threads, with a boost clock of 3.90 GHz, create a CPU bottleneck at 1080p. The data shows only a 21.3% difference between Low and Ultra at that resolution.

Q: Which preset offers the best experience at 1440p?

A: Ultra at 140.9 FPS is the strongest choice, as it remains well above 120 FPS while providing the highest visual quality in the dataset.

Q: How does the 4K Ultra performance compare to 1080p Ultra?

A: The 4K Ultra score of 78.5 FPS is 59.7% lower than the 1080p Ultra score of 195 FPS, showing the significant GPU load increase at higher resolutions.

Q: What is the GPU's memory capacity and does it matter here?

A: The RX 7900 XTX has 24 GB of GDDR6 memory with a 384-bit bus. The data shows no VRAM-related issues at any resolution or setting in Doom.

Q: Is the CPU or GPU the limiting factor at 1440p High?

A: The 1440p High score of 173.8 FPS is only 16.4% below the 1080p High score, indicating the CPU still constrains performance at 1440p, though less so than at 1080p.

CPU Role

The AMD Ryzen 5 2600 is a six-core, 12-thread processor based on the Zen+ architecture, manufactured on a 12 nm process. Its base clock is 3.40 GHz, boosting to 3.90 GHz, with 16 MB of shared L3 cache. The Cinebench R23 multi-core score of 11,186 and single-core score of 1,579 place it in the 77th percentile of all CPUs. In Doom, this CPU's single-thread performance is the key constraint: the benchmark results show that at 1080p, frame rates across all settings cluster within a 41.4 FPS range, which is characteristic of a CPU-limited scenario.

The CPU's memory bandwidth of 46.9 GB/s and dual-channel DDR4 support are adequate for this game, but the processing power is not. The PassMark single-thread score of 2,239 and multi-thread score of 13,160 indicate a processor that was mid-range at its 2018 release. In Doom, a game that scales well with high IPC, the Ryzen 5 2600 cannot keep pace with the RX 7900 XTX's ability to render frames. The result is that at 1080p, the system delivers 195-236 FPS depending on settings, but the GPU could likely produce far more if paired with a newer CPU. The CPU's 65 W TDP and unlocked multiplier suggest overclocking headroom, but the stock 3.90 GHz boost is what the data reflects.

GPU Role

The AMD Radeon RX 7900 XTX is a flagship GPU built on the RDNA 3.0 architecture, using a 5 nm process with 57,700 million transistors. It features 6,144 shading units, 384 texture mapping units, and 192 render output units, with 96 ray-tracing cores. The GPU's game clock is 2,365 MHz, with a boost clock of 2,498 MHz. Its 24 GB of GDDR6 memory operates at 20 Gbps effective, delivering 960.0 GB/s of bandwidth across a 384-bit bus. The FP32 performance of 61.39 TFLOPS places it in the 85th percentile of all GPUs, with an average benchmark score of 44,019.

In Doom, the GPU's role becomes dominant at 4K. The data shows that at 4K, the difference between Low and Ultra settings is 48.9 FPS (38.4% of Low), which is the largest spread of any resolution. This indicates the GPU is fully utilized at 4K, with the shading and fill-rate demands of Ultra settings (479.6 GPixel/s pixel rate, 959.2 GTexel/s texture rate) becoming the limiting factor. The GPU's performance is also notable for its consistency: the 4K High score of 97 FPS represents a 1.24x improvement over the 4K Ultra score, showing that the card has substantial headroom even at this demanding resolution. The end-of-life production status and launch MSRP of 999 USD do not affect the measured results, which show a GPU capable of 4K play in Doom with appropriate settings.