Based on benchmarks and testing, here is what I would recommend as the best CPU + GPU combo for smooth 4K gaming at high settings and 60+ FPS:

CPU: The Intel Core i7-14700K is the sweet spot. It provides excellent gaming performance that matches or edges out the 14600K and 14900K in many games when paired with a top-tier GPU. It has high single core speeds and plenty of efficiency cores for background tasks. It's a great blend of price and performance.

GPU: The Nvidia RTX 4090 is in a league of its own right now when it comes to 4K gaming. It delivers well over 60 FPS at max settings in demanding titles at 4K, with some games exceeding 100+ FPS. This gives you room to turn settings up and enables much higher frame rates if you have a high refresh rate 4K monitor.

Alternative GPU Option: If the RTX 4090 is over budget, the RTX 4080 16GB is the next best choice that still delivers excellent 4K gaming performance. Expect 60+ FPS at near max settings in most AAA titles. It has more VRAM versus the 12GB 4080 model.

CPU + GPU Combo: The Core i7-14700K + RTX 4090 is the ultimate combo for 4K gaming right now. With this CPU + GPU pair, you can achieve 100+ FPS in many titles at max settings. It's overkill for 60 Hz 4K gaming but allows you to take full advantage of high refresh rate 4K monitors.

The 13700K and 4080 16GB combo is also very capable, achieving 60+ FPS in most games with some optimized settings. This saves you money for just smooth 4K 60 Hz gaming.

CPU: 7800X3D, GPU: RTX 4080 SUPER

For 4K gaming at 120/144Hz, aim for high-end GPUs like the RTX 4090 or RX 7900 XTX. A 60Hz TV allows for slightly lower specs, but 4K resolution remains demanding. While the GPU handles most of the workload at 4K, pairing these powerful graphics cards with a capable CPU like the Ryzen 7600X or Intel i5-14600K is advisable. This combination ensures optimal performance, allowing you to fully leverage the potential of your high-resolution, high-refresh-rate setup without bottlenecking your system.

The best choice should be the 9800X3D (to be released soon) and RTX 4090.

9800X3D and RTX 5090 combo.

Based on the details you provided, here is what I would recommend for a high-performance 4K gaming rig:

CPU: AMD Ryzen 7 7800X3D This CPU offers the best gaming performance currently thanks to its large 3D V-Cache. It outperforms the i7-14700K in most games and provides smooth minimum frame rates. The extra cache helps eliminate CPU bottlenecks, especially at higher resolutions.

GPU: NVIDIA RTX 4090 For consistent 60+ FPS 4K gaming at maximum settings, the RTX 4090 is currently the fastest consumer GPU available. It provides nearly 2x the performance of the previous generation RTX 3090 Ti. With 24GB VRAM, it can handle any modern AAA game maxed out.

The RTX 4080 16GB is also a great option if you want to save some money. It still delivers excellent 4K performance, usually above 60 FPS for most titles. However, there will be more compromising of settings compared to the 4090.

This CPU + GPU combination will allow you to game comfortably at 4K with all the visual bells and whistles turned up. You'll get high frame rates now and excellent performance for years to come thanks to their high-end processing power. Let me know if you need any other component recommendations for your build!

For maximum 4K gaming performance, I'd go with the AMD Ryzen 7 7800X3D and either the RTX 4080 SUPER or RTX 4090. The 7800X3D's 3D V-Cache gives it a big boost in gaming workloads, allowing it to match or exceed the i7-14700K in most titles.

How is the new announced Ryzen 9000 series ?