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Quick Answer
The i7-14700K is overkill for pure 1440p gaming, but it is a solid choice if you multitask or plan to keep your PC for 4+ years. For gaming alone, the i5-14600K delivers within 2-3% of the performance at a much lower price.
The i7-14700K offers 20 cores (8P+12E) and 5.6 GHz boost clocks. For 1440p gaming, most of these cores sit unused, but there are scenarios where the extra power helps.
The difference is 2-4 fps on average - not perceptible during gameplay.
If you stream, record gameplay, have Discord running, and keep 30 browser tabs open, the 14700K's extra cores prevent any performance hitches. The i5 handles this too, but with less headroom.
Games are gradually using more threads. The 14700K's 20 cores may age better than the 14600K's 14 cores over the next 4-5 years. However, by then you will likely want a new platform regardless.
The i5-14600K or Ryzen 7 7800X3D are better value for 1440p gaming. The 7800X3D is actually faster in many games thanks to V-Cache while costing less than the 14700K.
Our Verdict
The i7-14700K is more CPU than you need for 1440p gaming. An i5-14600K or Ryzen 7 7800X3D delivers nearly identical gaming performance and better value. Choose the 14700K only if you genuinely need the extra cores for productivity.
The 7800X3D beats the i7-14700K in gaming by 5-10% at 1080p and 3-5% at 1440p thanks to its 96MB V-Cache. The 14700K dominates in productivity with its 20 cores. For pure gaming, buy the 7800X3D. For gaming plus content creation, buy the 14700K.
No, the i5-14600K does not bottleneck the RTX 4070 Super. This 14-core CPU (6P+8E) with 5.3 GHz boost is essentially a slightly faster i5-13600K and handles any current gaming GPU without issues. You will see GPU-limited performance at all resolutions.
Yes, the Ryzen 9 7900X is overkill for pure 1440p gaming. Its 12 cores and 24 threads provide no meaningful advantage over the Ryzen 5 7600 in games at this resolution. However, it makes sense if you also do content creation, streaming, or productivity work.