Doom

The AMD Ryzen 9 9900X3D paired with the AMD Radeon RX 6600 produces a combination that is heavily skewed toward CPU capability in Doom. The 12-core, 24-thread processor is a top-tier part, but the 8 GB graphics card is a mid-range component. The benchmark data reveals how this imbalance plays out across resolutions and settings, with the GPU becoming the clear limiting factor as graphical load increases.

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

The AMD Ryzen 9 9900X3D is built on the Zen 5 architecture and codenamed Granite Ridge, featuring 12 cores and 24 threads. It operates with a base clock of 4.40 GHz and a boost clock of 5.50 GHz, supported by a 128 MB L3 cache. This is a desktop processor on the AMD Socket AM5 platform, and its benchmark scores place it in the 91st percentile among all CPUs tested. The data shows strong multi-threaded performance, with a Cinebench R23 multicore score of 47737 and a Geekbench multicore score of 22884. Single-thread performance is equally impressive, with a Cinebench R23 singlecore score of 6739 and a Geekbench singlecore score of 3041.

In the context of Doom, the CPU's role is to feed the GPU with draw calls and game logic. The game is an FPS with a 2016 release date, meaning it was built for hardware that is now several generations old. The Ryzen 9 9900X3D's high single-thread performance and massive cache are more than sufficient to handle Doom's engine requirements, even at high frame rates. The data supports this: at 1080p with Low settings, the combination achieves 176 FPS, and at 1080p High it reaches 129 FPS. These numbers indicate the CPU is not a bottleneck at lower resolutions, as the frame rates scale consistently with GPU load.

Looking at the CPU's nearest rivals, the Intel Core Ultra 5 245KF has an average benchmark score of 55093, which is -0.6% relative to the Ryzen 9 9900X3D's average score of 54762. The Intel Core Ultra 5 245K is 1.3% ahead, and the Intel Xeon 6505P is 2% ahead. These are all very close scores, suggesting that in CPU-bound scenarios, the Ryzen 9 9900X3D is competitive with but not clearly superior to these alternatives. However, the 3D V-Cache technology, while not detailed in the pack, is a known advantage for gaming, and the benchmark results indicate the processor is not the limiting factor in this specific combination.

The CPU's memory support is DDR5 with a dual-channel bus and a bandwidth of 89.6 GB/s. It also supports ECC memory, which is a server-grade feature. The processor has a TDP of 120 W and is built on a 4 nm process at TSMC, with a transistor count of 16,630 million. These specifications point to a modern, efficient design that produces high performance without excessive power draw. For Doom, the CPU's job is easy, and the measured FPS figures confirm that the processor is rarely the constraint, especially when compared to the GPU's performance ceiling.

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

The AMD Radeon RX 6600 is a RDNA 2.0 architecture graphics card, part of the Radeon RX 6000 series, and it is now end-of-life. It has 8 GB of GDDR6 memory on a 128-bit bus, with a memory bandwidth of 224.0 GB/s. The card's game clock is 2044 MHz, with a boost clock of 2491 MHz. It features 1792 shading units, 112 texture mapping units, and 64 ROPs. The FP32 performance is 8.928 TFLOPS. The GPU's average benchmark score is 19036, placing it in the 63rd percentile among all GPUs.

The RX 6600 is clearly the weaker link in this combination. Its nearest rivals include the NVIDIA Quadro K6000 (deltaPct 0%), the NVIDIA GeForce RTX 4050 Mobile (-0.1%), and the NVIDIA Tesla K20m (-0.3%). These are all older or lower-tier parts, confirming that the RX 6600 sits in the mid-range segment. The data shows that as resolution and settings increase, the GPU becomes the dominant constraint. At 4K Ultra, the average FPS drops to 37, while at 1080p Low it reaches 176 FPS. This is a classic pattern of a GPU that cannot keep up with the CPU's capabilities at higher loads.

The 8 GB VRAM is sufficient for Doom at 1080p and 1440p, but at 4K High settings, the average FPS of 45 suggests the card is struggling with both memory bandwidth and compute load. The 128-bit memory bus and 224.0 GB/s bandwidth are modest by modern standards, and the 4K results reflect this limitation. The GPU's TDP is 132 W, with a suggested PSU of 300 W, making it a relatively efficient card, but efficiency does not translate to high-end performance. The pixel rate of 159.4 GPixel/s and texture rate of 279.0 GTexel/s are adequate for 1080p gaming but are stretched at 4K.

The GPU supports DirectX 12 Ultimate, Vulkan 1.4, and OpenGL 4.6, which are all compatible with Doom's requirements. However, the benchmark results indicate that the RX 6600 is best suited for 1080p and 1440p gaming, where it delivers playable frame rates. At 4K, the card is only capable of smooth gameplay on Low settings, with 62 FPS. The data makes it clear that this is a GPU-limited scenario, and the CPU's performance is largely wasted at higher resolutions.

FAQ

Q: What is the best resolution and settings combination for this setup?

A: At 1080p Medium, the combo delivers 153 FPS, which is smooth and visually balanced. At 1440p Medium, it drops to 99 FPS, still playable. For 4K, only Low settings at 62 FPS are acceptable, as High and Ultra drop to 45 FPS and 37 FPS respectively.

Q: Is the CPU or GPU the bottleneck in this system?

A: The data shows the GPU is the bottleneck. At 1080p Low, the combo reaches 176 FPS, but at 4K Ultra it falls to 37 FPS. The CPU's high benchmark scores (91st percentile) and the GPU's mid-range scores (63rd percentile) indicate the RX 6600 cannot fully utilize the Ryzen 9 9900X3D's capabilities.

Q: How does the RX 6600 compare to its closest rival, the NVIDIA Quadro K6000?

A: The RX 6600 has an average benchmark score of 19036, while the Quadro K6000 has a score of 19030, resulting in a deltaPct of 0%. They are essentially equal in overall performance, but the RX 6600 supports modern APIs like DirectX 12 Ultimate, which is relevant for Doom.

Q: Can this combo handle 4K gaming?

A: Yes, but only at Low settings, where it achieves 62 FPS. At Medium, the average FPS drops to 54, and at High it falls to 45 FPS. Ultra settings are not recommended, with an average of 37 FPS.

Q: What is the CPU's performance percentile?

A: The Ryzen 9 9900X3D is in the 91st percentile among all CPUs, with an average benchmark score of 54762. Its closest rival, the Intel Core Ultra 5 245KF, is only -0.6% behind, indicating the CPU is a high-end part.

Q: What is the GPU's memory bandwidth?

A: The RX 6600 has 8 GB of GDDR6 memory on a 128-bit bus, providing a bandwidth of 224.0 GB/s. This is a limiting factor at 4K, where the memory bandwidth is insufficient for high settings.

How This Combo Ranks

The combination of the AMD Ryzen 9 9900X3D and the AMD Radeon RX 6600 ranks 2255 out of 2930 tested combos in Doom. This places the combo in the bottom 23% of all tested systems, which is a poor result given the CPU's high-end status. The rank is primarily dragged down by the GPU's mid-range performance. The data shows that while the CPU is in the 91st percentile, the GPU is only in the 63rd percentile, creating a significant imbalance.

The ranking suggests that this is not an optimal pairing for Doom. Many other combinations with lower-tier CPUs but higher-tier GPUs would likely rank better. The CPU's 12 cores and 24 threads are overkill for a game like Doom, which is not heavily multi-threaded. The GPU's 8 GB VRAM and 128-bit memory bus are the limiting factors, and the combo's performance at 4K Ultra (37 FPS) is a clear indicator of this.

The rank of 2255 out of 2930 is a blunt metric, but it aligns with the measured FPS data. At 1080p, the combo performs well, but at 4K, it falls behind many other systems. The data suggests that a user would be better served by pairing the Ryzen 9 9900X3D with a more powerful GPU, or by accepting that this combo is designed for 1080p and 1440p gaming only. The CPU is a future-proof investment, but the GPU will need an upgrade to unlock its full potential.

Resolution Scaling

The FPS data shows a clear scaling pattern from 1080p to 4K. At 1080p Low, the combo achieves 176 FPS. At 1440p Low, the average FPS drops to 114, a 35% reduction. At 4K Low, the average FPS falls to 62, a 65% reduction from 1080p. This steep decline indicates that the GPU is the limiting component, as the CPU should easily handle the increased resolution without a significant performance hit.

At High settings, the scaling is similar: 129 FPS at 1080p, 84 FPS at 1440p (a 35% drop), and 45 FPS at 4K (a 65% drop from 1080p). The consistent percentage drops across settings confirm that the GPU is the bottleneck. The CPU's high single-thread performance and cache size are not strained by higher resolutions, but the RX 6600's compute units and memory bandwidth are.

The Medium settings data provides min and max FPS values, which show the frame time consistency. At 1080p Medium, the average is 153 FPS with a min of 130 and max of 176. At 1440p Medium, the average is 99 FPS with a min of 84 and max of 114. At 4K Medium, the average is 54 FPS with a min of 46 and max of 62. The min-to-max spread is roughly consistent, but the average drop is steep, again pointing to GPU limits.

The resolution scaling analysis suggests that the combo is best used at 1080p, where it can maintain high frame rates. At 1440p, it is still playable, but at 4K, only Low settings are viable. The data shows that the GPU is the primary constraint, and any attempt to play at 4K will require significant setting reductions.

Measured FPS Breakdown

The measured FPS data provides a complete picture of the combo's performance across all resolutions and settings. At 1920x1080, the combo delivers excellent frame rates. With Low settings, the average FPS is 176, which is extremely smooth. Medium settings reduce the average to 153 FPS, with a min of 130 and max of 176. High settings drop the average to 129 FPS, and Ultra settings lower it further to 106 FPS. All of these are playable for a fast-paced FPS like Doom.

At 2560x1440, the performance is still good but shows the GPU's limitations. Low settings yield 114 FPS, Medium settings drop to 99 FPS (min 84, max 114), High settings fall to 84 FPS, and Ultra settings bring the average down to 68 FPS. These are all playable, but the gap between Low and Ultra is 46 FPS, indicating the GPU's scaling is not linear.

At 3840x2160, the combo struggles. Low settings produce 62 FPS, which is borderline playable. Medium settings drop to 54 FPS (min 46, max 62), High settings fall to 45 FPS, and Ultra settings produce only 37 FPS. These numbers are not ideal for a competitive shooter, where frame rate consistency is important. The data shows that this combo is not designed for 4K gaming, and users should stick to 1080p or 1440p for the best experience.

The breakdown also shows that the CPU's performance is consistent across all settings, as the FPS drops are directly proportional to the GPU load. The Ryzen 9 9900X3D is never the bottleneck, as even at 4K Ultra, the 37 FPS is a result of the RX 6600's limitations, not the CPU's. The data is clear: this is a GPU-bound system at all resolutions, and the CPU has significant headroom for a future GPU upgrade.