Doom

The AMD Ryzen 5 3600 paired with the NVIDIA GeForce RTX 5090 presents a fascinating study in bottleneck dynamics within Doom, a 2016 FPS title. The data shows a combination where a last-generation mid-range CPU meets a current flagship GPU, resulting in performance that is heavily dictated by resolution and settings. This pairing ranks 221st out of 1681 tested combos in this game, placing it in the top 13% of all configurations tested. The measured frames per second reveal a system that is powerful enough for high-refresh-rate gaming at 1440p, yet exhibits clear signs of CPU limitation at lower resolutions.

Resolution Scaling

The FPS progression from 1080p to 4K tells a clear story about where the bottleneck lies in this system. At 1080p with High settings, the combo produces 240.8 FPS, which drops to 207.7 FPS at 1440p and further to 120.5 FPS at 4K. This represents a 50% reduction in frame rate from 1080p to 4K at High settings. However, the more telling data point is the difference between Low settings at each resolution. At 1080p Low, the system achieves 266.6 FPS, but at 1440p Low it only drops slightly to 229.4 FPS. This modest 14% decline suggests that at lower graphical loads, the CPU becomes the limiting factor, preventing the GPU from fully flexing its muscles.

The pattern intensifies when examining the jump from 1440p to 4K. At Medium settings, the frame rate falls from 223.1 FPS at 1440p to 139.8 FPS at 4K, a 37% decrease. This steeper drop indicates that as resolution increases, the GPU workload becomes more dominant, shifting the bottleneck away from the CPU. The Ryzen 5 3600, with its 6 cores and 12 threads, appears to hit a performance ceiling around the 230-260 FPS range in this game, regardless of how light the GPU load becomes. This explains why the 1080p to 1440p scaling at Low settings is so minimal—the CPU is already saturated.

GPU Role

The RTX 5090 brings overwhelming specifications to this pairing, with 32 GB of GDDR7 memory on a 512-bit bus providing 1.79 TB/s of bandwidth. Its boost clock of 2407 MHz and 21760 shading units represent the absolute top tier of consumer graphics hardware. In this benchmark context, the GPU's role is to deliver the raw pixel-pushing power that allows for high frame rates at demanding resolutions. The data confirms this, as the 4K Ultra setting still manages 99.9 FPS, which reflects the GPU's capability even when paired with a comparatively modest processor.

The VRAM capacity of 32 GB is far beyond what this 2016 title requires, meaning memory capacity is never a limiting factor in these results. The GPU's 104.8 TFLOPS of FP32 performance and 423.6 GPixel/s pixel rate are more than sufficient to handle Doom's Vulkan-based rendering engine at any settings combination. The measured data shows the GPU's headroom is most evident at 4K, where the performance gap between Low (162.3 FPS) and Ultra (99.9 FPS) settings demonstrates the graphics card's ability to scale with visual fidelity. At 1080p, however, the GPU's potential is clearly untapped, as the frame rates plateau around 240-266 FPS, suggesting the processor is holding back what could be much higher numbers.

CPU Role

The AMD Ryzen 5 3600 is a Zen 2 architecture processor with 6 cores and 12 threads, base clock of 3.60 GHz and boost clock of 4.20 GHz. Its benchmark results show it sits at the 76th percentile of all CPUs, with an average benchmark score of 18129. This places it in direct competition with the Intel Core i5-11400, which scores 18150 (a 0.1% difference), and the AMD Ryzen 5 7535HS at 18101 (0.2% difference). In Doom, the CPU's 32 MB of shared L3 cache and dual-channel DDR4 memory support are relevant factors, but the game's engine appears to be more sensitive to single-thread performance than raw core count.

The CPU's single-thread score of 696 in 3DMark and 892 in Cinebench R20 single-core paints a picture of modest per-core capability relative to modern flagships. This becomes the primary constraint at 1080p, where the frame rates across all settings (266.6 FPS Low, 256.8 FPS Medium, 240.8 FPS High, 225.2 FPS Ultra) show a maximum spread of only 41 FPS. This tight clustering indicates that the CPU is the limiting component, as reducing GPU load through lower settings does not produce proportional frame rate increases. The processor's 12 threads do provide enough parallelism for Doom's multi-threaded rendering, but the per-core performance ceiling is what ultimately caps the system's potential at lower resolutions.

How This Combo Ranks

With a combo rank of 221 out of 1681 tested combinations, this pairing sits in the 86.9th percentile of all tested systems in Doom. This ranking reflects the system's ability to deliver high frame rates at 1440p and 4K, where the GPU can operate more freely. The rank is particularly impressive given the CPU's age and market position, as the Ryzen 5 3600 was released in 2019 and is now several generations old. The RTX 5090's position in the 94th percentile of all GPUs, with an average benchmark score of 84306, helps boost the overall combination.

The deltaPct values from the CPU's nearest rivals show that this processor is evenly matched with its immediate competitors, with differences of only 0.1-0.3% in average score. This means that swapping to an Intel Core i5-11400 or a Ryzen 5 7535HS would likely produce nearly identical results in this game. Similarly, the GPU's nearest rivals show the RTX 5090 D at 0.1% higher performance and the RTX 5050 Mobile at 0.2% higher, indicating that the desktop RTX 5090 is at the very top of the performance stack for this benchmark. The ranking of 221st suggests that while the combo is strong, there are 220 other configurations that achieve higher frame rates in Doom, likely featuring newer high-end CPUs that can better feed the RTX 5090 at lower resolutions.

FAQ

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

A: The highest measured average FPS is 266.6, achieved at 1920x1080 with Low settings.

Q: How does the CPU bottleneck manifest at 1080p?

A: At 1080p, the frame rate difference between Low (266.6 FPS) and Ultra (225.2 FPS) settings is only 41 FPS, indicating the CPU limits performance before the GPU can show its full strength.

Q: Is the RTX 5090's 32 GB VRAM utilized in this game?

A: No, Doom from 2016 does not require anywhere near 32 GB of VRAM, so the memory capacity is never a limiting factor in these results.

Q: What is the biggest performance drop between resolutions?

A: At High settings, the drop from 1440p (207.7 FPS) to 4K (120.5 FPS) represents the largest absolute decline of 87.2 FPS.

Q: How does this combo compare to the RTX 5090 D?

A: The RTX 5090's average benchmark score of 84306 is 0.1% lower than the RTX 5090 D's 84241 score, making them essentially equivalent in performance.

Q: What does the combo rank of 221 out of 1681 indicate?

A: It places this configuration in the top 13% of all 1681 tested combos in Doom, showing it is a strong performer despite the CPU's age.

Measured FPS Breakdown

At 1920x1080, the system delivers its highest frame rates across all settings. The Low preset achieves 266.6 FPS, Medium reaches 256.8 FPS, High produces 240.8 FPS, and Ultra manages 225.2 FPS. The progression shows a total reduction of 41.4 FPS from Low to Ultra, representing a 15.5% performance cost for maximum visual fidelity. These numbers indicate that at 1080p, the CPU is the primary constraint, as even the most demanding settings fail to push the GPU into a limiting position.

Moving to 2560x1440, the frame rates remain high but begin to show more differentiation between settings. Low produces 229.4 FPS, Medium achieves 223.1 FPS, High delivers 207.7 FPS, and Ultra falls to 177.2 FPS. The spread between Low and Ultra here is 52.2 FPS, which is larger than at 1080p, suggesting the GPU is starting to become more involved in the performance equation. The 1440p High setting still exceeds 200 FPS, making this resolution an excellent choice for high-refresh-rate monitors.

At 3840x2160, the GPU's influence becomes dominant. Low settings produce 162.3 FPS, Medium drops to 139.8 FPS, High achieves 120.5 FPS, and Ultra manages 99.9 FPS. The performance gap between Low and Ultra is 62.4 FPS, the largest of any resolution, confirming that 4K is where the RTX 5090's capabilities are most fully utilized. Even at Ultra settings, the game remains playable at nearly 100 FPS, which is a strong result for a 2016 title at maximum resolution.

Settings Recommendations

For players targeting the highest possible frame rates, the 1080p Low preset at 266.6 FPS is the clear choice, though it sacrifices visual quality. However, the data suggests that Medium at 1080p (256.8 FPS) offers a better balance, as it provides only a 3.7% frame rate reduction while presumably improving visual fidelity. At 1440p, the Medium preset at 223.1 FPS represents the sweet spot for high-refresh-rate gaming, offering 96.7% of the Low preset's performance while likely providing significantly better image quality.

For 4K gaming, the High preset at 120.5 FPS provides a compelling experience, delivering more than double the frame rate of the Ultra preset's 99.9 FPS while still offering substantial visual quality. The 20.6 FPS difference between High and Ultra at 4K may not justify the graphical upgrade for competitive play. The data indicates that the Medium preset at 1440p (223.1 FPS) is the best overall choice for this combo, as it balances high frame rates with what is likely a good visual experience, while the 4K High setting at 120.5 FPS is optimal for those prioritizing resolution over maximum frame rates.