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Quick Answer
The Ryzen 9 7950X3D edges ahead in gaming by 3-8% thanks to V-Cache, while the i9-14900K wins in multi-threaded productivity by 10-15%. Both are overkill for gaming. For pure gaming, the 7800X3D outperforms both at half the price.
The Ryzen 7 7800X3D ($480 AUD) matches or beats both in gaming while costing $500-700 less. If you do not need 12+ cores for productivity, the 7800X3D is the smarter gaming purchase.
The 7950X3D is nearly twice as power-efficient during gaming.
Our Verdict
For gaming, the 7950X3D wins but the 7800X3D beats both for half the price. For productivity, the 14900K is slightly ahead. Neither is a sensible pure gaming purchase when the 7800X3D exists.
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.
The Ryzen 7 7800X3D does not bottleneck the RTX 4090 at 1440p or 4K. In fact, the 7800X3D is the single best gaming CPU you can pair with the RTX 4090 thanks to its massive 96MB 3D V-Cache, which eliminates CPU-side frame drops.
No, the Ryzen 9 7950X3D does not bottleneck the RTX 4090 at 4K. This is the most powerful consumer CPU available, with 16 cores and 128MB of combined cache. At 4K, it delivers the same gaming performance as the 7800X3D while offering unmatched productivity.