You can connect just one 8-pin connector for the CPU, but you’ll still need the 4-pin headers.
You can connect just one 8-pin connector for the CPU, but you’ll still need the 4-pin headers.
You might not use both because they serve different purposes or have conflicting requirements.
The additional four-pin connector is mainly beneficial for the 13900K model. The EPS connectors are connected in parallel, meaning as long as at least one is connected, you should be fine. If you don’t have a spare four-pin from your power supply, there’s no need to worry about acquiring one.
My PSU only has 3x8-pin connectors—two for the GPU and one for the CPU. That means the remaining four pins are unused. It should handle up to 50 watts, right? Sounds good.