The three white slots on the computer motherboard are PCI slots, which are used to insert PCI expansion cards to extend the functionality of the computer using the slot.

1, PCI slot, is based on the PCI local bus (Peripheral Component Interconnection, Peripheral Component Expansion Interface) expansion slot. Its color is generally cream, located on the motherboard below the AGP slot, above the ISA slot. Its bit width of 32-bit or 64-bit, operating frequency of 33MHz, the maximum data transfer rate of 133MB / sec (32-bit) and 266MB / sec (64-bit). It can be plugged into a graphics card, sound card, network card, built-in Modem, built-in ADSL Modem, USB2.0 card, IEEE1394 card, IDE interface card, RAID card, TV card, video capture card, and a wide variety of other expansion cards.

2, PCI (Peripheral Component Interconnect) is a kind of Intel (Intel) company launched in 1991 for the definition of the local bus standard. This standard allows up to 10 PCI-compliant expansion cards to be installed in a computer.

3. See the light-colored slots pointed to by the red arrows in the following figure: