Doom

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

The measured FPS data for Doom with the AMD Ryzen 7 5700G and AMD Radeon RX 7900 XTX reveals a pronounced scaling pattern as resolution climbs. At 1080p with Low settings, the combo delivers 343.7 FPS. Moving to 1440p drops that to 233.9 FPS, a reduction of roughly 110 FPS. At 4K, the same Low preset yields 126.3 FPS, which is less than half of the 1080p figure. This steep decline suggests that at lower resolutions, the system is heavily CPU-bound — the Ryzen 7 5700G’s 8 cores and 16 threads are likely the limiting factor, while the RX 7900 XTX has ample headroom. The fact that 1080p Low exceeds 340 FPS indicates the GPU is nowhere near its ceiling at that setting.

The Ultra preset tells a different story. At 1080p Ultra, the combo manages 218.2 FPS, while 1440p Ultra falls to 140.8 FPS, and 4K Ultra bottoms out at 79.8 FPS. The gap between 1080p and 1440p Ultra is 77.4 FPS, but the gap between 1440p and 4K Ultra is 61 FPS — a relatively smaller absolute drop, yet a larger percentage decline. This pattern implies that as settings rise, the GPU becomes more of a bottleneck, particularly at 4K where the RX 7900 XTX’s 24 GB of GDDR6 memory and 960.0 GB/s bandwidth are being pushed harder. The data suggests a classic hybrid scenario: the CPU governs performance at 1080p, while the GPU takes over at higher resolutions and heavier settings.

What is curious is the scaling between Medium and High at each resolution. At 4K, High averages 93.3 FPS while Medium hits 109 FPS — a 15.7 FPS difference. At 1440p, High yields 175.3 FPS versus Medium’s 206.2 FPS, a 30.9 FPS gap. At 1080p, the gap widens to 51.4 FPS (266.8 vs 318.2). This widening delta at lower resolutions reinforces the CPU-bound nature of 1080p gameplay — the GPU can render both settings quickly, but the CPU’s ability to feed frames becomes the constraint. The RX 7900 XTX’s 61.39 TFLOPS FP32 performance is more than sufficient for Doom’s engine, so the scaling pattern points to the Ryzen 7 5700G’s Zen 3 architecture, with its 3.80 GHz base and 4.60 GHz boost clocks, as the primary limiter in lighter scenes.

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

The Ryzen 7 5700G brings 8 cores and 16 threads to the table, built on the Zen 3 architecture with a 7 nm process. Its base clock of 3.80 GHz and boost clock of 4.60 GHz are respectable for a desktop part, but the data shows this CPU struggles to keep pace with the RX 7900 XTX at lower resolutions. The benchmark results for the CPU indicate a single-thread score of 899 in 3dmark and 2930 in Cinebench R23, while multi-thread scores reach 6629 and 20755 respectively. These numbers place the CPU in the 83rd percentile versus all CPUs, with an average benchmark score of 25626. When paired with a GPU that sits in the 85th percentile with an average score of 44019, the imbalance becomes apparent.

In Doom, which is known for its id Tech engine, thread utilization matters. The 16 threads of the 5700G are likely leveraged well, but the single-thread performance — reflected in the 3dmark single-thread score of 899 — appears to cap frame rates. At 1080p Low, the combo hits 343.7 FPS, but the CPU’s per-core performance may be the reason it cannot go higher. The nearest rivals to the 5700G include the AMD Ryzen 7 6800U (deltaPct -0.3) and Intel Core 5 210H (deltaPct 0.5), all within a narrow band of average scores. This suggests the 5700G is competitively positioned among its peers, yet the ultra-high refresh rates demanded by Doom at 1080p expose its limits.

Interestingly, the CPU’s 16 MB of L3 cache and dual-channel DDR4 memory support with 51.2 GB/s bandwidth may also play a role. Doom’s engine benefits from memory bandwidth, and while the 5700G’s 51.2 GB/s is adequate, it lags behind what newer platforms offer. The data indicates that at 4K, the CPU’s influence wanes — the frame rate drops are more attributable to GPU load. At 4K Ultra, the 79.8 FPS result suggests the RX 7900 XTX is doing the heavy lifting, with the CPU providing just enough throughput. The question that arises is whether a higher-clocked CPU would push 1080p results further, but the measured data does not include such a comparison — it only shows this specific combo’s behavior.

FAQ

Q: What is the highest average FPS this combo achieves in Doom?

A: The highest recorded average is 343.7 FPS at 1920x1080 with Low settings. This is the peak across all measured configurations.

Q: How much does performance drop from 1080p to 4K at Ultra settings?

A: At 1080p Ultra, the combo achieves 218.2 FPS, while 4K Ultra yields 79.8 FPS. This represents a drop of 138.4 FPS, or roughly 63% lower performance at 4K.

Q: Is the CPU or GPU more likely to be the bottleneck at 1080p?

A: The data suggests the CPU is the primary limiter at 1080p. The gap between Low (343.7 FPS) and Ultra (218.2 FPS) is 125.5 FPS, indicating the GPU can handle both settings easily, but the CPU restricts higher frame rates.

Q: Does the RX 7900 XTX’s 24 GB VRAM make a difference in Doom?

A: Doom’s system requirements are modest, so the 24 GB GDDR6 memory is unlikely to be fully utilized. The GPU’s 960.0 GB/s bandwidth and 61.39 TFLOPS are more relevant, but the measured data does not isolate VRAM usage.

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

A: The combo ranks 265th out of 1681 tested combos in Doom, placing it in the top 16% of all tested systems.

Q: What is the difference between Medium and High settings at 1440p?

A: At 2560x1440, Medium averages 206.2 FPS while High averages 175.3 FPS — a difference of 30.9 FPS in favor of Medium.

How This Combo Ranks

The combo of the AMD Ryzen 7 5700G and AMD Radeon RX 7900 XTX holds a rank of 265 out of 1681 tested combos in Doom. This places it in the upper tier of tested systems, roughly in the 84th percentile of all combinations. Given that the GPU alone sits in the 85th percentile and the CPU in the 83rd, the combo’s ranking is consistent with the individual components’ standings. However, the ranking also reveals that many other combos outperform this pairing, likely those with newer or higher-clocked CPUs that can better feed the RX 7900 XTX at lower resolutions.

The data implies that the GPU is not the limiting factor — the RX 7900 XTX’s nearest rivals include the AMD Radeon Pro 580 (deltaPct -0.4) and NVIDIA GeForce RTX 4070 Ti (deltaPct -2), indicating the GPU is competitive. The CPU’s nearest rivals are closely matched, with deltaPct values ranging from -0.3 to 0.6. This suggests that the combo’s rank is dragged down by the CPU’s performance ceiling in Doom’s engine. At 4K, where the GPU is more stressed, the combo’s ranking would likely be higher relative to other systems, but the overall rank of 265 reflects the 1080p and 1440p results where the CPU’s 8 cores and 16 threads are insufficient to unlock the GPU’s full potential.

What stands out is the gap between the combo’s rank and the GPU’s percentile. The RX 7900 XTX is a top-tier card, yet the combo does not crack the top 200. This disparity points to the CPU as the weak link — a conclusion supported by the FPS scaling data. For gamers seeking maximum frame rates in Doom, this pairing delivers excellent results, but it does not top the charts.

Measured FPS Breakdown

At 1920x1080, the combo delivers its strongest results. Low settings produce 343.7 FPS, Medium 318.2 FPS, High 266.8 FPS, and Ultra 218.2 FPS. The spread between Low and Ultra is 125.5 FPS, highlighting the impact of settings at this resolution. Moving to 2560x1440, the numbers drop: Low 233.9 FPS, Medium 206.2 FPS, High 175.3 FPS, and Ultra 140.8 FPS. The delta between Low and Ultra here is 93.1 FPS, a narrower margin than at 1080p, suggesting the GPU is beginning to exert more influence.

At 3840x2160, the results are substantially lower: Low 126.3 FPS, Medium 109 FPS, High 93.3 FPS, and Ultra 79.8 FPS. The difference between Low and Ultra is 46.5 FPS, the smallest absolute spread across all resolutions. This pattern confirms that at 4K, the GPU is the dominant factor — the RX 7900 XTX’s rendering load scales with resolution, and the CPU’s role diminishes. Notably, the transition from 1440p to 4K at Ultra settings results in a 61 FPS drop (140.8 to 79.8), which is a 43% reduction. In contrast, the 1080p to 1440p Ultra drop is 77.4 FPS, a 35% reduction. The percentage changes indicate that 4K is where the GPU truly bottlenecks, while 1440p still has some CPU headroom.

Settings Recommendations

For the smoothest experience, the data points to Medium settings as the sweet spot. At 1080p Medium, the combo hits 318.2 FPS, which is close to the Low preset’s 343.7 FPS but with better visual fidelity. The gap between Medium and High at 1080p is 51.4 FPS, suggesting that High incurs a noticeable performance penalty for modest visual gains. At 1440p, Medium’s 206.2 FPS remains well above 144 Hz refresh rates, while High drops to 175.3 FPS — still playable but with less headroom. At 4K, Medium’s 109 FPS is the only setting that breaks the 100 FPS barrier, making it the recommended choice for 4K displays.

Ultra settings are best avoided at 4K, where the 79.8 FPS result dips below 80 FPS. At 1440p, Ultra’s 140.8 FPS is acceptable for 144 Hz monitors but offers no advantage over High’s 175.3 FPS given the extra GPU load. The data suggests that High is the optimal preset for 1440p, balancing visual quality with performance. For 1080p, Medium provides the best ratio of frame rate to quality — the 318.2 FPS result is within 7% of Low’s peak, while High’s 266.8 FPS represents a 16% drop from Medium. Based on the measured rows, Medium at 1080p and 1440p, and Medium at 4K, deliver the most consistent experience across all resolutions.

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

The AMD Radeon RX 7900 XTX is a powerhouse, with 24 GB of GDDR6 memory on a 384-bit bus delivering 960.0 GB/s of bandwidth. Its base clock is 1929 MHz, boosting to 2498 MHz, with a game clock of 2365 MHz. These specifications translate to 61.39 TFLOPS of FP32 performance and a pixel rate of 479.6 GPixel/s. In Doom, the GPU’s role becomes increasingly critical at higher resolutions. The 4K results — 126.3 FPS at Low and 79.8 FPS at Ultra — demonstrate that the GPU is the limiting factor at this resolution. The 46.5 FPS spread between Low and Ultra at 4K is the smallest of any resolution, indicating that the GPU is saturated even at Low settings.

The GPU’s 192 ROPs and 384 TMUs are well-suited to Doom’s rendering demands. The 24 GB VRAM is overkill for this game, but the memory bandwidth is likely a key contributor to the high frame rates at 1440p and 4K. The GPU’s average benchmark score of 44019 places it in the 85th percentile, and its nearest rivals include the NVIDIA GeForce RTX 4070 Ti (deltaPct -2) and AMD Radeon Pro 580 (deltaPct -0.4). These comparisons show the RX 7900 XTX is a top-tier card, yet the combo’s overall performance is constrained by the CPU at lower resolutions. At 4K, the GPU’s strengths shine — the 93.3 FPS at High settings is respectable for a demanding resolution, and the 126.3 FPS at Low shows the card’s raw power. The data indicates that this GPU is capable of far more than the CPU allows at 1080p, but at 4K, it delivers a balanced experience.