North bridge chip

Generally close to the CPU.

Southbridge

The logo above is ATI's chipset.

CMOS battery

Generally, it is a lithium battery, and the 3V model is CR2035. Mainly to store time and CMOS setting information.

VIA 1394 chip

This is a special VIA 1394 chip for brand machines or motherboards, but the USB interface is not easy to check.

Network card chip

This is the real network card chip.

PCI slot

It's a standard PCI slot, but the one above you is a PCI-E 16X graphics card high-speed slot. Don't get mixed up.