The ZX-490-F model has 12 CPU pins, so you should connect all of them properly.
The ZX-490-F model has 12 CPU pins, so you should connect all of them properly.
It simply indicates the CPU has additional space available. You're aware of the EPS connector? No, it's only needed for very high temperatures. One 8-pin can deliver up to 384 watts, which a regular user probably won't hit. Edited July 7, 2020 by TofuHaroto
For ambient cooling, the additional 4-pin connector makes sense mainly when you're running at very high frequencies—such as 5.3GHz all-core configurations—and you're likely facing thermal challenges right away. Still, I'm confident ASUS employs the high-current versions of their power connectors on Z490 boards (or similar premium models), capable of handling over 400W. In that case, you probably won't need the extra 4-pin. Simply plug in the 8-pin and you're good to go.