Doom

The Intel Core i5-12600KF paired with the NVIDIA GeForce RTX 5090 produces a fascinating dataset in Doom, one that clearly delineates the boundaries between CPU and GPU limitation. This combination ranks 14th out of 1,681 tested combos, placing it in the top 1% of all configurations. The measured frames per second (FPS) reveal a system that is overwhelmingly capable, yet the scaling patterns show exactly where the bottlenecks lie.

Resolution Scaling

The FPS drop from 1080p to 4K is steep and revealing. At 1080p with Low settings, the combo hits 410.4 FPS, but at 4K Low, that number falls to 159.4 FPS — a reduction of roughly 61%. This is a massive performance cliff that points directly at the GPU as the primary limiter at higher resolutions, which is expected given the sheer pixel-count jump from 2.1 million to 8.3 million pixels.

The pattern holds across all settings. High settings show a drop from 339.9 FPS at 1080p to 118.6 FPS at 4K, a 65% decrease. Medium settings fall from 389.9 to 137.9 FPS (65% drop), and Ultra drops from 278.9 to 99.5 FPS (64% drop). The consistency of this ~60-65% reduction across every preset strongly indicates that the RTX 5090 is the determining factor — the CPU is not being stressed enough at 4K to matter.

However, the 1080p results tell a different story. At 1080p Low, the combo reaches 410.4 FPS, but at 1080p Ultra, it drops to 278.9 FPS. That is only a 32% reduction, far less than the resolution scaling would suggest if the GPU were the only constraint. This narrower gap at 1080p hints that the CPU begins to impose a ceiling. The i5-12600KF's single-thread performance, measured at 3,309 in Cinebench R23, is strong, but at these extreme frame rates, even a capable processor starts to become the limiting factor. The data shows that at 1440p Low, the combo still manages 300.7 FPS, which is very close to the 1080p Low figure — again suggesting the CPU is holding things back before the GPU load becomes dominant.

GPU Role

The RTX 5090 is a monster of a card, and its specifications confirm why it dominates at 4K. It carries 32 GB of GDDR7 memory on a 512-bit bus, delivering 1.79 TB/s of bandwidth. For Doom, a 2016 title, this is an absurd amount of memory and bandwidth — the game simply cannot saturate it. The card's 104.8 TFLOPS of FP32 performance and 423.6 GPixel/s pixel rate are far beyond what this game requires.

What matters more for Doom is the clock behavior. The card boosts to 2407 MHz, and with 21,760 shading units, it can brute-force its way through the game's rendering demands. The 4K Ultra result of 99.5 FPS is telling — this is a game from a decade ago, and even at maximum settings and 4K resolution, the card still delivers nearly 100 FPS. The fact that the GPU is the bottleneck at 4K is clear from the scaling: moving from Low to Ultra at 4K costs 59.9 FPS (from 159.4 to 99.5), which is a 38% performance hit. That is a pure GPU workload increase from higher-quality rendering.

The GPU's average benchmark score of 84,306 places it in the 94th percentile of all GPUs, and its nearest rival, the RTX 5090 D, is essentially tied at 84,241 (0.1% delta). This confirms the card is operating at the very top of the GPU hierarchy. For Doom, the VRAM is irrelevant — 32 GB is overkill for a game that could run on a fraction of that — but the raw compute power is what drives those 4K numbers.

How This Combo Ranks

The combo's rank of 14 out of 1,681 tested configurations is exceptional. It places this pairing in the 99.2nd percentile of all combinations in the database. This is not just a fast setup; it is one of the fastest ever measured for this game.

Looking at the individual components, the CPU's average benchmark score of 27,827 puts it in the 84th percentile of all CPUs. Its nearest rival is the Intel Core i9-10900K, which scores 27,829 (a 0% delta), meaning the i5-12600KF is effectively tied with a previous-generation flagship. The i5-12600K scores 27,851 (0.1% higher), and the Core Ultra 5 125H scores 27,872 (0.2% higher). These are all within a rounding error, confirming that the i5-12600KF is not holding back the RTX 5090 in any meaningful way.

The GPU's rank is even more impressive. With an average score of 84,306, it sits in the 94th percentile of all GPUs. Its nearest rival is the RTX 5090 D at 84,241 (0.1% delta), and the RTX 5050 Mobile is surprisingly close at 84,171 (0.2% delta), though that is likely a database anomaly. The AMD Radeon PRO W6600 trails by 1.3%, and the NVIDIA CMP 40HX is actually ahead by 1.6%, but those are workstation cards, not direct gaming competitors.

The combination of a top-16th-percentile CPU with a top-6th-percentile GPU results in a top-14 combo. The data shows that this pairing is well-balanced for Doom: the CPU is fast enough to feed the GPU at 1080p, and the GPU is fast enough to crush 4K.

Settings Recommendations

The measured data provides clear guidance on settings. At 4K, the High preset delivers 118.6 FPS, which is the sweet spot for a smooth experience on a high-refresh-rate 4K display. Ultra drops to 99.5 FPS — still playable, but you are sacrificing 19 FPS for marginal visual gains in a game that already looks dated. Medium at 4K gives 137.9 FPS, which is better if you prioritize frame rate over visual fidelity.

For 1440p, the choice is more nuanced. High delivers 216.4 FPS, which is excellent for 240Hz monitors. Medium hits 257.2 FPS, and Low reaches 300.7 FPS. The jump from Low to Medium costs 43.5 FPS (from 300.7 to 257.2), but the visual improvement is substantial. Ultra at 1440p drops to 176.5 FPS, which is still very high.

At 1080p, the situation is different. Low hits 410.4 FPS, Medium 389.9 FPS, and High 339.9 FPS. The gap between Low and Medium is only 20.5 FPS, and between Medium and High it is 50 FPS. The CPU is clearly the limiting factor here, as even at Low the frame rate cannot break much past 410 FPS. Ultra drops to 278.9 FPS, a 131.5 FPS loss from Low — that is a 32% reduction, which is much larger than the 1440p Ultra-to-Low drop of 41% (from 300.7 to 176.5). This confirms that at 1080p, the CPU is the bottleneck, and increasing settings does not cost as much as it should if the GPU were fully utilized.

The best experience per the data is 1440p High at 216.4 FPS or 4K High at 118.6 FPS. The High preset appears to be the optimal balance across all resolutions, offering the best frame-per-visual-cost ratio.

FAQ

*Q: Can this combo run Doom at 4K with maximum settings?*

A: Yes. The 4K Ultra preset delivers 99.5 FPS, which is above the 60 FPS threshold for smooth play. You will not get a locked 120 FPS at 4K Ultra, but it is perfectly playable.

Q: Is the CPU or GPU the bottleneck at 1080p?

A: The data indicates the CPU is the limiting factor at 1080p. At Low settings, the combo hits 410.4 FPS, but at Ultra it only drops to 278.9 FPS — a 32% reduction. If the GPU were fully utilized, the drop would be larger, as seen at 4K where the reduction is over 60%.

Q: How does the i5-12600KF compare to its closest rivals?

A: The i5-12600KF scores 27,827 on average, which is essentially tied with the Intel Core i9-10900K at 27,829 (0% delta). It is also within 0.2% of the i5-12600K and the Core Ultra 5 125H, showing it is a top-tier performer for this game.

*Q: Does the RTX 5090's 32 GB of VRAM matter for Doom?*

A: No. Doom is a 2016 title that does not require anywhere near 32 GB of VRAM. The card's raw compute power, not its memory capacity, is what drives the high frame rates.

Q: What is the best resolution for this combo?

A: 1440p High at 216.4 FPS offers the best balance. It provides a very high frame rate that exceeds most high-refresh-rate monitors, and the visual quality is strong. If you have a 4K display, 4K High at 118.6 FPS is also excellent.

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

A: It ranks 14th out of 1,681 combos, placing it in the top 1% of all tested pairings. The GPU is in the 94th percentile of all GPUs, and the CPU is in the 84th percentile.

CPU Role

The Intel Core i5-12600KF is a 10-core, 16-thread processor based on the Alder Lake architecture, built on a 10 nm process. It has a base clock of 3.70 GHz and a boost clock of 4.90 GHz. For Doom, a game that is not heavily multithreaded, the single-thread performance is what matters most. The CPU scores 3,309 in Cinebench R23 single-core, which is strong but not class-leading. The boost clock of 4.90 GHz is the key figure here — it allows the processor to respond quickly to the game's draw calls.

The 1080p results show the CPU's influence. At 1080p Low, the combo hits 410.4 FPS, which is likely near the CPU's maximum frame delivery capability for this game engine. The fact that 1440p Low only drops to 300.7 FPS — a 27% reduction — suggests that the CPU is still keeping up at 1440p. But at 4K Low, the drop to 159.4 FPS is a 61% reduction from 1080p Low, which is a GPU-driven decline.

The CPU's multi-threaded performance is respectable, with a Cinebench R23 multi-core score of 23,444, but it is not what drives Doom's frame rates. The game's engine is more sensitive to single-thread performance and memory latency. The CPU's 20 MB of shared L3 cache and dual-channel memory support are adequate for this title.

The key takeaway is that the i5-12600KF is sufficient to feed the RTX 5090 at 1080p up to roughly 410 FPS, but it does cap the system's maximum output. If you were to pair this GPU with a faster CPU, the 1080p numbers might improve slightly, but the 4K results would remain unchanged because the GPU is the bottleneck there. For a game like Doom, this CPU-GPU pairing is well-matched, with the CPU providing ample headroom for all but the most extreme 1080p frame-rate chases.