What is the main board of a system unit?

Answer 1

The main circuit board of a computer is referred to as the motherboard.

It's called a motherboard. any smaller circuit boards attached to it that stick out the back are called PCI cards and have different functions (networking, sound, video and such)

Answer 2

The board in the main circuit of the computer system, is known as the Motherboard. This controls all of the computer, and is where essential parts, such as R.A.M. (Random Access Memory), Graphics Cards, BIOS Chips and Cooling Systems are intergrated.

Answer 3

Is usually called the motherboard or less frequently the main board

Answer 4

It's called a motherboard. any smaller circuit boards attached to it that stick out the back are called PCI cards and have different functions (networking, sound, video and such)

Answer 5

Motherboard
Its called the Mother Board.