Doom

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

The AMD Ryzen 5 3600 is a 6-core, 12-thread processor from the 3000 series, built on the Zen 2 architecture (Matisse) using TSMC's 7 nm process. Its base clock is 3.60 GHz with a boost clock of 4.20 GHz, and it carries 32 MB of shared L3 cache plus 512 KB of L2 per core. The CPU's single-thread performance, as measured by Cinebench R23, is 2124 points, while its multi-core score reaches 15045 points. These figures place the processor in the 76th percentile among all CPUs tested.

For a 2016 FPS title like Doom, the Ryzen 5 3600's six physical cores are more than sufficient to feed the GPU. The game's engine was designed around the era's quad-core processors, so twelve threads provide substantial headroom. Benchmark data from 3DMark shows the CPU scaling from 1361 points at 2 threads to 4605 points at 16 threads, indicating that multi-threaded scaling is present but not steep — the jump from 8 threads (3844) to 16 threads (4605) is a 19.8% improvement, which suggests the architecture benefits from additional threads but does not rely on them heavily.

The CPU's nearest rival, the Intel Core i5-11400, scores 18150 in average benchmark score versus the Ryzen's 18129, a delta of -0.1%. This effectively ties the two processors in overall compute performance. In the context of Doom, this parity means the Ryzen 5 3600 will not be a limiting factor at any tested resolution, as the game's demands are modest relative to the CPU's capabilities. The processor's 65 W TDP and dual-channel DDR4 memory support with 51.2 GB/s bandwidth are adequate for sustaining high frame rates without bottlenecking.

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

The AMD Radeon RX 6750 XT is built on the RDNA 2.0 architecture (Navi 22 chip) and carries 12 GB of GDDR6 memory on a 192-bit bus, yielding 432.0 GB/s of bandwidth. Its base clock runs at 2150 MHz, with a game clock of 2495 MHz and a boost clock of 2600 MHz. The GPU's 2560 shading units, 160 texture mapping units, and 64 render output units deliver a peak FP32 throughput of 13.31 TFLOPS. Memory operates at 2250 MHz, which translates to 18 Gbps effective.

In Doom, the GPU's memory configuration proves critical at higher resolutions. The 12 GB VRAM capacity is ample for the game's texture demands, even at 4K Ultra settings. The pixel rate of 166.4 GPixel/s and texture rate of 416.0 GTexel/s indicate the card can handle the fill-rate requirements of the id Tech engine's fast-paced rendering. The GPU benchmarks show a 3DMark Steel Nomad DX12 score of 2548, and PassMark G3D score of 20700, which places it in the 79th percentile among all GPUs.

The nearest GPU rival, the AMD Radeon RX 5600M, scores 35264 in average benchmark score versus the 6750 XT's 35327, a 0.2% difference. The NVIDIA GeForce RTX 3080 scores 35787, which is 1.3% higher. These narrow margins indicate the RX 6750 XT sits in a competitive performance band. The GPU's 250 W TDP and PCIe 4.0 x16 interface ensure sufficient bandwidth for the game's data streaming. DirectX 12 Ultimate support means the card can leverage modern rendering features, though Doom's original release predates many of these.

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

The measured frame rates reveal a clear scaling pattern across resolutions. At 1080p High settings, the combo achieves 175.8 FPS average. Moving to 1440p High drops this to 116.2 FPS, a 33.9% reduction. At 4K High, the average falls to 62.1 FPS, which is 64.7% lower than the 1080p result. This scaling pattern strongly indicates the GPU becomes the primary limiting factor as resolution increases.

Looking at Low settings, the trend is even more pronounced. At 1080p Low, the system produces 242.2 FPS, while 1440p Low yields 157.7 FPS (34.9% drop), and 4K Low settles at 84.9 FPS (65.0% drop). The consistent ~35% drop from 1080p to 1440p and ~65% drop from 1080p to 4K across both Low and High presets suggests the performance ceiling is dictated by the GPU's rendering throughput rather than CPU limitations.

The Ultra preset shows a similar pattern: 147.8 FPS at 1080p, 94.5 FPS at 1440p (36.1% drop), and 52.2 FPS at 4K (64.7% drop). The fact that the relative drops remain nearly constant across presets indicates the CPU maintains sufficient headroom even at high frame rates. If the CPU were the bottleneck at 1080p, we would expect to see smaller percentage drops when moving to higher resolutions, as the GPU would become more loaded. Instead, the proportional scaling points to a GPU-bound scenario at all resolutions tested.

The absolute numbers reinforce this interpretation. At 1080p Low, the system pushes 242.2 FPS, which is far beyond the CPU's single-thread capability to bottleneck — the 3DMark single-thread score of 696 and Cinebench R23 single-core of 892 are respectable, but at such high frame rates, the CPU must work hard. Yet the fact that 4K Low still delivers 84.9 FPS shows the GPU remains the constraining component.

How This Combo Ranks — use comboRankInGame vs other tested combos

This specific pairing of AMD Ryzen 5 3600 with AMD Radeon RX 6750 XT achieves a combo rank of 808 out of 1681 tested combinations in Doom. This places it in the upper-middle portion of the distribution, at approximately the 48th percentile of all combos. The rank reflects the balance between the CPU's 76th percentile standing and the GPU's 79th percentile, but the game's moderate demands mean the GPU's performance ceiling becomes the dominant factor.

The data indicates that this combo outperforms roughly half of the tested configurations, which suggests that while the individual components are solidly mid-pack, the combination does not reach the upper echelon. This is consistent with the GPU being the limiting factor — a stronger GPU would push this combo higher in the rankings. The CPU's performance parity with the Intel Core i5-11400 (delta -0.1%) means swapping the CPU for a comparable rival would not materially change the ranking. Similarly, the GPU's close margins to the RX 5600M (0.2% higher) and RTX 3080 (1.3% lower) mean the ranking is sensitive to GPU selection.

The 808th rank out of 1681 combos suggests that in Doom, this system delivers a playable experience at all tested settings, but it does not dominate the field. The measured FPS data shows that at 1080p, the combo delivers well above 144 FPS at High and Medium settings, which is excellent for high-refresh-rate displays. At 1440p, it still exceeds 90 FPS at High and Medium, while at 4K, it falls below 60 FPS only at Ultra (52.2 FPS). The ranking reflects this balanced but not exceptional performance envelope.

FAQ

Q: What is the maximum average FPS this combo achieves at 1080p?

A: The highest measured average at 1920x1080 is 242.2 FPS at Low settings, with Medium reaching 212.1 FPS and High at 175.8 FPS.

Q: Does this system maintain 60 FPS at 4K Ultra settings?

A: No. At 3840x2160 Ultra, the average FPS drops to 52.2, which is below the 60 FPS threshold. However, at 4K High, the average is 62.1 FPS, which does exceed 60 FPS.

Q: How does the CPU compare to its nearest rival in overall performance?

A: The AMD Ryzen 5 3600 scores 18129 in average benchmark score, which is within 0.1% of the Intel Core i5-11400 (18150) and within 0.2% of the AMD Ryzen 5 7535HS (18101).

Q: What is the GPU's memory bandwidth and how does it affect 4K performance?

A: The RX 6750 XT has 432.0 GB/s of memory bandwidth from its 12 GB GDDR6 on a 192-bit bus. This bandwidth supports 4K High at 62.1 FPS, but 4K Ultra exceeds the card's capacity, dropping to 52.2 FPS.

Q: Is the CPU or GPU more likely to bottleneck in Doom?

A: Benchmark results show the GPU is the limiting factor. The consistent ~65% FPS drop from 1080p to 4K across all presets indicates GPU-bound performance, while the CPU's 12 threads provide ample headroom.

Q: What percentile does the GPU rank among all tested GPUs?

A: The AMD Radeon RX 6750 XT sits in the 79th percentile among all GPUs, with an average benchmark score of 35327.

Settings Recommendations

The measured FPS data provides clear guidance for optimal settings. At 1920x1080, all presets deliver playable frame rates, with High (175.8 FPS) and Medium (212.1 FPS) both exceeding 144 FPS for high-refresh-rate monitors. Ultra still reaches 147.8 FPS, so there is no reason to compromise at this resolution — the Ultra preset is entirely viable.

At 2560x1440, the choice becomes more nuanced. High settings deliver 116.2 FPS, which is smooth for most displays. Medium reaches 134.8 FPS, and Low hits 157.7 FPS. Ultra drops to 94.5 FPS, which remains above 60 FPS but is noticeably lower. For 1440p, High or Medium offers the best balance, as the visual difference between High and Ultra in this title is typically modest while the performance gap is 23.0% (116.2 vs 94.5 FPS).

At 3840x2160, the data shows a tighter range. High settings yield 62.1 FPS, barely above the 60 FPS target. Medium produces 73.7 FPS, while Low reaches 84.9 FPS. Ultra falls to 52.2 FPS, which is below the 60 FPS threshold and may cause noticeable stuttering. For 4K, the recommendation is Medium or High — Medium provides a 18.7% FPS improvement over High while likely maintaining acceptable visual quality. Low could be considered for competitive play, but the visual degradation may not justify the 36.8% FPS gain over Medium.

The overall recommendation based on measured data is to use High settings at 1080p or 1440p for the best balance of visual fidelity and performance, and Medium at 4K to maintain smooth frame rates. Ultra settings are only advisable at 1080p, where the performance cost is minimal relative to the frame rates achieved.