Doom

# Doom — AMD Ryzen 5 5600G + NVIDIA GeForce RTX 5080

This pairing combines a 6-core Zen 3 desktop APU with NVIDIA's flagship Blackwell 2.0 GPU, producing a fascinating bottleneck study in a 2016 FPS title. The measured frames across three resolutions and four settings tiers reveal a system where the RTX 5080 is rarely the limiting factor — and where the Ryzen 5 5600G's single-thread performance becomes the ceiling at lower resolutions. The combo ranks 92nd out of 1,681 tested combinations in Doom, placing it in the top 5.5% of all pairings, yet the data suggests the CPU holds back a GPU that ranks in the 89th percentile among all GPUs.

Resolution Scaling

The FPS drop from 1080p to 4K tells a clear story about where the bottleneck lives. At Ultra settings, the average frame rate falls from 255.6 FPS at 1920x1080 to 163.2 FPS at 2560x1440, then to 90.7 FPS at 3840x2160 — a 64.5% reduction from 1080p to 4K. This steep decline indicates the GPU becomes progressively more engaged as pixel count rises, which is expected for a 4K-class card. However, the Low preset tells a different tale: 334.1 FPS at 1080p drops to 275.7 FPS at 1440p, but only to 146.4 FPS at 4K. The 1080p-to-1440p gap of just 58.4 FPS (17.5%) suggests the CPU is capping performance at lower resolutions — the RTX 5080 simply cannot stretch its legs when the Ryzen 5 5600G is feeding it frames as fast as possible.

The Medium preset scaling reinforces this. From 315.7 FPS at 1080p to 243.1 FPS at 1440p is a 72.6 FPS drop, but the 1440p-to-4K drop of 110.4 FPS is much larger proportionally. This pattern — modest declines at lower resolutions followed by sharp drops at 4K — is the signature of a CPU-bound system at 1080p and 1440p that finally becomes GPU-bound at 4K. The High preset shows the same shape: 300.2 FPS at 1080p, 202.9 FPS at 1440p, and 108.6 FPS at 4K. Notably, the 4K High result is only 17.9 FPS higher than the 4K Ultra result, suggesting that even at 4K, the CPU's frame delivery is starting to constrain the GPU's ability to differentiate between settings.

How This Combo Ranks

The combo rank of 92 out of 1,681 tested combinations places this pairing in the 94.5th percentile of all CPU-GPU combos tested in Doom. This is a strong showing, but the gap between the GPU's individual percentile (89th among all GPUs) and the combo's percentile suggests the CPU is pulling the overall result down. The Ryzen 5 5600G sits in the 78th percentile among all CPUs, which is respectable but not elite — and Doom's engine appears sensitive to single-thread performance, where this CPU scores 872 in 3dmark_single_thread and 2,365 in Cinebench R23 single-core.

The nearest CPU rivals in aggregate benchmark scores bracket the 5600G closely. The Intel Core i7-11600H scores 19,949 (0.2% lower), while the Intel Core i7-11800H and AMD EPYC 7713P both score 20,024 (0.2% higher). The AMD Ryzen Threadripper PRO 5995WX trails by 0.3% at 19,928. These tiny deltas — all within 0.5% — confirm the 5600G's multi-threaded throughput is competitive with mobile H-series chips and even a 64-core server processor, at least in synthetic aggregate benchmarks. Yet in Doom specifically, the combo's rank suggests the CPU's single-thread ceiling matters more than its aggregate score.

The GPU's nearest rivals in average benchmark score are all Intel Arc or older AMD workstation cards: the Arc A570M at 58,239 (1.6% lower), Arc Pro A60 at 60,326 (1.9% higher), Arc A580 at 57,756 (2.5% lower), and Radeon Pro W5500X at 57,661 (2.6% lower). None of these are remotely comparable to the RTX 5080 in raw gaming performance, which highlights that the benchmark database's nearest-rival list is based on synthetic averages, not Doom-specific results. The RTX 5080's 89th percentile GPU rank and 59,188 average benchmark score place it far above these rivals, yet in Doom the combo's 92nd rank reflects the CPU's limiting role.

GPU Role

The RTX 5080 brings 16 GB of GDDR7 memory on a 256-bit bus, delivering 960.0 GB/s of bandwidth. It operates at a base clock of 2,295 MHz and boosts to 2,617 MHz, with memory running at 1,875 MHz (30 Gbps effective). The card's 10,752 shading units, 336 texture mapping units, and 112 ROPs provide the raw pixel throughput — 293.1 GPixel/s — that Doom's id Tech 6 engine can exploit once the CPU feeds it enough geometry.

The measured FPS data indicates the GPU is fully capable of handling Doom at 4K with High settings, where it averages 108.6 FPS. That is a playable result, but the Ultra preset drops to 90.7 FPS — still smooth but showing the GPU is working harder. The 16 GB VRAM is far more than Doom requires; this 2016 title was designed for GPUs with a fraction of that memory, so VRAM capacity is not a limiting factor in any of the measured rows. The memory bandwidth of 960.0 GB/s, however, does appear to matter: the 4K High-to-Ultra drop of 17.9 FPS (from 108.6 to 90.7) suggests the card's texture rate and memory bandwidth are being taxed by Ultra settings.

The GPU's Blackwell 2.0 architecture supports DirectX 12 Ultimate, which Doom can use, but the game's Vulkan path is where it historically shines. The GPU's Vulkan score of 257,942 in Geekbench and OpenCL score of 264,461 indicate strong compute capabilities, but these don't translate directly to the measured FPS. What matters is that the RTX 5080's 56.28 TFLOPS of FP32 performance is dramatically more than Doom needs at 1080p — the CPU simply cannot feed it fast enough, as evidenced by the 334.1 FPS Low preset ceiling at 1080p.

Measured FPS Breakdown

At 1920x1080, the Ryzen 5 5600G + RTX 5080 combo delivers 334.1 FPS on Low, 315.7 FPS on Medium, 300.2 FPS on High, and 255.6 FPS on Ultra. The gap between Low and Ultra is 78.5 FPS (23.5%), which is remarkably narrow — at 1080p, the CPU is the primary constraint, and changing graphics settings has a muted effect because the GPU has idle headroom to spare.

Moving to 2560x1440, the results are 275.7 FPS on Low, 243.1 FPS on Medium, 202.9 FPS on High, and 163.2 FPS on Ultra. The Low-to-Ultra gap widens to 112.5 FPS (40.8%), showing the GPU is taking on more work. The High-to-Ultra drop of 39.7 FPS is the largest single-settings jump at this resolution, indicating Ultra settings introduce a significant rendering load.

At 3840x2160, the numbers compress dramatically: 146.4 FPS on Low, 132.7 FPS on Medium, 108.6 FPS on High, and 90.7 FPS on Ultra. The Low-to-Ultra gap is now 55.7 FPS (38.0%), but the absolute values are much lower. The 4K Low result of 146.4 FPS is lower than the 1080p Ultra result of 255.6 FPS — a 109.2 FPS difference that cannot be explained by settings alone. This is the resolution where the GPU finally becomes the limiting component, and the data shows the transition point sits somewhere between 1440p and 4K.

CPU Role

The Ryzen 5 5600G is a 6-core, 12-thread Zen 3 processor running at 3.90 GHz base and 4.40 GHz boost, with a 65W TDP. Its 16 MB of L3 cache and dual-channel DDR4 memory support (51.2 GB/s bandwidth) are modest by 2025 standards, but the architecture's single-thread efficiency is strong: the 3dmark_single_thread score of 872 and Cinebench R23 single-core score of 2,365 are competitive for a 2021 APU.

In Doom, the CPU's influence is most visible at 1080p, where the Low preset only reaches 334.1 FPS. This is not a GPU limitation — the RTX 5080 could theoretically output far more frames at 1080p Low. The CPU's 6 cores and 12 threads are sufficient for Doom's multi-threaded engine, as evidenced by the 3dmark_max_threads score of 5,455 and Cinebench R23 multicore score of 16,758. However, the game's frame pacing and draw call submission depend on single-thread performance, and the 5600G's 4.40 GHz boost clock — while respectable — cannot match the clock speeds of newer desktop CPUs.

The aggregate benchmark scores place the 5600G within 0.3% of its nearest rivals, but those rivals include mobile chips (i7-11600H, i7-11800H) and server processors (EPYC 7713P, Threadripper PRO 5995WX). In Doom specifically, the combo's 92nd rank out of 1,681 — despite the GPU's 89th percentile — suggests the CPU is the weaker link. The 3dmark_16_threads score of 5,451 and 3dmark_8_threads score of 4,694 show decent scaling, but the single-thread score of 872 indicates the per-core performance that Doom's engine relies upon is the bottleneck.

FAQ

Q: Why does the FPS drop so little between Low and Ultra at 1080p but much more at 4K?

A: At 1920x1080, the CPU limits performance — Low hits 334.1 FPS and Ultra hits 255.6 FPS, a narrow 78.5 FPS gap. At 3840x2160, the GPU becomes the bottleneck, and the Low-to-Ultra spread narrows to 55.7 FPS but the absolute values fall to 146.4 and 90.7 FPS respectively.

Q: Is this combo better ranked in Doom than the individual components would suggest?

A: The combo ranks 92nd out of 1,681 (top 5.5%), while the GPU ranks in the 89th percentile and the CPU in the 78th percentile. The combo's rank is better than either component's percentile, indicating the pairing works well together despite the CPU bottleneck at lower resolutions.

Q: What is the CPU's single-thread performance, and why does it matter for Doom?

A: The Ryzen 5 5600G scores 872 in 3dmark_single_thread and 2,365 in Cinebench R23 single-core. Doom's frame delivery depends heavily on single-thread throughput, which is why the 1080p Low preset caps at 334.1 FPS — the CPU cannot feed the GPU faster.

Q: How does the RTX 5080's memory configuration affect Doom performance?

A: The 16 GB GDDR7 VRAM on a 256-bit bus provides 960.0 GB/s bandwidth. Doom's 2016 engine does not require this much memory or bandwidth, so VRAM is not a limiting factor in any measured row — the GPU's compute and texturing capabilities are what matter.

Q: Is 4K Ultra playable with this combo?

A: Yes, the measured 90.7 FPS at 3840x2160 Ultra is above the 60 FPS threshold for smooth play. The 4K High preset achieves 108.6 FPS, offering a slightly higher frame rate with minimal visual compromise.

Q: What do the nearest rival comparisons reveal about the CPU's standing?

A: The Ryzen 5 5600G's average benchmark score of 19,983 sits within 0.3% of the Intel Core i7-11600H (19,949), i7-11800H and EPYC 7713P (both 20,024), and Threadripper PRO 5995WX (19,928). This shows the 5600G is competitive in aggregate compute, but Doom's single-thread sensitivity means those synthetic scores don't fully predict gaming performance.

Settings Recommendations

The measured data points to a clear sweet spot: 2560x1440 High settings delivers 202.9 FPS, which is the best balance of resolution and visual fidelity among the tested rows. At 1080p, even Ultra hits 255.6 FPS, but the CPU caps the experience — there is no benefit to dropping below High since the frame rate barely changes. For players prioritizing frame rate, 1080p Low at 334.1 FPS is the fastest measured configuration, but the 300.2 FPS at 1080p High is nearly as fast with better visuals.

At 4K, the choice depends on preference: Ultra at 90.7 FPS is fully playable, but High at 108.6 FPS offers a 19.7% frame rate increase for a modest visual downgrade. The Medium preset at 4K (132.7 FPS) provides the largest performance jump from High (108.6 FPS) — a 24.1 FPS improvement — and is likely the best option for high-refresh 4K displays. The data shows that at 1440p, Ultra (163.2 FPS) remains above the 144 Hz threshold, making it the recommended preset for that resolution if the display supports it. For 1080p, High or Ultra are both viable, with the CPU limiting the difference to 44.6 FPS between them.