Intel Core i5-12600K + NVIDIA GeForce RTX 4090
Will they bottleneck? Here’s the verdict at 1440p gaming — and how it shifts with resolution.
Intel Core i5-12600K
10c / 16t · 4.9 GHz · 125W
NVIDIA GeForce RTX 4090
24 GB VRAM · 82.6 TFLOPS · 450W
Balanced. Neither part is meaningfully limiting the other.
Well-balanced for gaming at 1440p — both parts are within tolerance.
GRADE
S
PSU MIN
1050W
CONFIDENCE
86%
THE SHORT ANSWER
The Intel Core i5-12600K + NVIDIA GeForce RTX 4090 pairing is rated Grade S for 1440p gaming with a recommended 1050W PSU. Resolution-by-resolution: 1080p: 2% CPU-bound, 1440p: balanced, 4K: balanced. CPU and GPU bottleneck verdicts depend on resolution — a pairing that is CPU-bound at 1080p is often perfectly balanced at 4K because the GPU does more work per frame as pixel count increases.
Engine accuracy: 21.6% MAE on measured FPS · methodology
Plain-English breakdown.
What this pairing actually means when you sit down to play.
The Intel Core i5-12600K + NVIDIA GeForce RTX 4090 pair is well-balanced at 1440p gaming. That story changes at other resolutions — see the breakdown below. As a build, it grades elite-tier (S).
Expect around 350 FPS in League of Legends and ~94 in the more demanding Starfield — both at 1440p with high or ultra presets. Resolution matters more than most calculators show — the same parts give different verdicts at 1080p, 1440p, and 4K because GPU work scales with pixel count while CPU work is roughly fixed per frame.
Both parts pull their weight; the highest-leverage next upgrade is to a fully higher tier rather than swapping one side. Plan on at least a 1050W PSU — that includes headroom for transient spikes on the NVIDIA GeForce RTX 4090.
The same pair gives a different answer at 1080p, 1440p, and 4K.
Higher resolutions push work onto the GPU — watch the balance shift.
1080P
2% CPU-bound
1440P
Balanced
4K
Balanced
Expected frame rates in 10 popular games.
At 1440p, high settings — measured where we have benchmarks, modeled otherwise.
- League of Legends350 fps · Estimated · low
- Apex Legends304 fps · Estimated · low
- Forza Horizon 5152 fps · Estimated · low
- The Witcher 3: Wild Hunt154 fps · Estimated · low
- Call of Duty: Warzone122 fps · Estimated · low
- Alan Wake 297 fps · Estimated · low
- Hogwarts Legacy95 fps · Estimated · low
- Starfield94 fps · Estimated · low
Compare similar builds.
Swap one part and see how the verdict moves.
Building around the NVIDIA GeForce RTX 4090? Read our tested guide: Best CPU for the NVIDIA GeForce RTX 4090 →
Common questions.
Straight answers for the Intel Core i5-12600K + NVIDIA GeForce RTX 4090.
Can the Intel Core i5-12600K run the NVIDIA GeForce RTX 4090?
Yes — the Intel Core i5-12600K runs the NVIDIA GeForce RTX 4090 very well. At 1440p the two are well-balanced (grade S), so neither part meaningfully holds the other back and you get close to the full performance both are capable of.
Will the NVIDIA GeForce RTX 4090 bottleneck the Intel Core i5-12600K?
The Intel Core i5-12600K + NVIDIA GeForce RTX 4090 pairing is rated Grade S for 1440p gaming with a recommended 1050W PSU. Resolution-by-resolution: 1080p: 2% CPU-bound, 1440p: balanced, 4K: balanced. CPU and GPU bottleneck verdicts depend on resolution — a pairing that is CPU-bound at 1080p is often perfectly balanced at 4K because the GPU does more work per frame as pixel count increases.
What PSU do I need for a Intel Core i5-12600K + NVIDIA GeForce RTX 4090 build?
For a Intel Core i5-12600K (125W TDP) paired with a NVIDIA GeForce RTX 4090 (450W TDP), we recommend a 1050W power supply at minimum. This includes 40% headroom over the parts' combined TDP plus 100W for the motherboard, RAM, fans, and storage.
Run your own combination.
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