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Computer hardware, which includes all the physical parts of a computer, to distinguish between the data that it contains or perform and the software that provides instructions for the hardware to complete the task. Computer hardware mainly includes: chassis, motherboard, bus, power supply, memory controller, interface card, portable storage devices, built-in memory, input devices, output devices, CPU fans, buzzer, etc..

A main board
The motherboard carrying the CPU (central processing unit), memory (random access memory) and expansion card slot (but CPU and memory are not integrated on the motherboard, not the motherboard attachment itself also belongs to the computer hardware) motherboard, also called the motherboard, the system board (systemboard) or motherboard (motherboard); it installed in the chassis, microcomputer is the most basic and most important part of. The motherboard is generally rectangular board, was installed above the main circuit composed of a computer system, and generally have a BIOS chip, I / O control chip, a keyboard and a panel control switch interface, lamp connectors, expansion slot, the motherboard and card DC power supply connectors and other components.

Graphics
Full display interface card (card Video, card Graphics), also known as the display adapter (adapter Video), the display configuration card referred to as the graphics card, is one of the most basic components of personal computer. The use of graphics are computer systems need to display information to convert the drive, and displays to provide line scanning signal and to control the display of the displayed correctly, is connected to an important component of the display and the personal computer motherboard, man-machine conversation is one of the most important equipment. Graphics as an important part of the host computer, to assume the task of the output display graphics, graphics designed for people engaged in professional graphics is very important.

Memory
Memory is one of the important parts of the computer, it is a bridge to communicate with CPU. All programs in the computer are run in memory, so the performance of the memory is very big to the computer. Memory (Memory) is also known as the memory storage, its role is to temporarily store the operation data in CPU, as well as the hard disk and other external memory data exchange. As long as the computer is running, CPU will need to operate the data transferred to the memory of the operation, when the CPU after the completion of the results of the transfer of the results, the memory of the operation of the computer also determines the stable operation. Memory is made up of memory chips, circuit boards, and gold fingers.

Hard disk
Hard disk (Hong Kong and Taiwan for hard disk drive (HDD), English Name: hard disc drive (HDD name Winchester type hard disk) is one of the main computer storage media, by one or a plurality of aluminum or glass discs. The disc is covered with iron magnetic material. The vast majority of the hard disk is fixed, fixed in the hard drive is permanently sealed in the hard drive.

Chassis
Chassis as a part of computer accessories. It plays the main role is placed and fixed the computer accessories, plays a supporting and protecting effect, in addition, the computer case has a very important role in the shielding of electromagnetic radiation, because the chassis as CPU, graphics card, motherboard and other accessories can quickly improve the performance of the whole machine, so in the DIY has not been listed as a priority. But the cabinet is not without effect, some users buy brand-name case, because the motherboard and chassis to form a loop, resulting in a short circuit, the system becomes unstable.