Computer case, Computer Enclosure
Computer case, Computer Enclosure
As a part of computer accessories, the main function of the chassis is to place and fix various computer accessories, and play a supporting and protective role.
In addition, the computer case plays an important role in shielding electromagnetic radiation.
Although it is not a very important configuration in DIY, using a poor quality chassis can easily short-circuit the motherboard and the chassis, making the computer system very unstable.
The chassis generally includes a shell, a bracket, various switches on the panel, indicator lights, etc.
The shell is made of a combination of steel plate and plastic with high hardness, which mainly protects the internal components of the chassis.
The bracket is mainly used to fix the motherboard, power supply and various drives.
There are many types of chassis. Now the more common ones in the market are AT, ATX, Micro ATX and the latest BTX-AT chassis. The full name of the chassis should be BaBy AT, which is mainly used in early machines that can only support AT motherboards.
ATX chassis is currently the most common chassis, supporting most types of motherboards.
The Micro ATX case is built on the basis of the AT case. In order to further save the desktop space, the volume of the Micro ATX case is smaller than that of the ATX case.
Each type of chassis can only install the motherboard of the type it supports, generally cannot be mixed, and the power supply is also different.
The newly launched BTX is short for Balanced Technology Extended.
The BTX architecture, the new specification for desktop computing platforms defined and guided by Intel, enables new form factors for next-generation computer system designs, enabling the industry to achieve the best balance of thermal management, system size and form factor, and noise.
Features of BTX's new architecture: it supports Low-profile, that is, a narrow board design, and the system structure will be more compact; the circuit layout of the main board is optimized for the movement of heat dissipation and airflow; the installation of the main board will be easier, and the mechanical performance will also be improved. Optimized design.
Basically, there are three types of BTX architectures, namely Standard BTX, Micro BTX and Pico BTX.
In terms of size, the entire series of BTX platform motherboards are not smaller than ATX motherboards, so the development of BTX is not for smaller desktop computers, but more flexible circuit wiring and modular component areas are BTX's The point is.
The most obvious difference between the BTX case and the ATX case is that the side panel that was only opened on the left side in the past has been changed to the right side. The other I/O interfaces have also been changed to the opposite position accordingly.
The interior of the BTX chassis is quite different from the ATX. The most interesting design focus of the BTX chassis is the improvement in heat dissipation. The positions of the CPU, graphics card and memory are completely different from the ATX architecture, and the position of the CPU is completely changed. Moved to the front panel of the chassis instead of the original rear position, this is to make more effective use of heat dissipation equipment and improve the heat dissipation efficiency of each device in the chassis.
To this end, the equipment of the BTX architecture will be configured linearly, and the design is mainly based on reducing the impedance factor of cooling airflow; by sucking cooling airflow backwards from the front of the chassis, and following the equipment arranged linearly inside, and finally in the The back of the chassis flows out.
This design is not only more conducive to improving the internal heat dissipation efficiency, but also can reduce the fan speed of the heat dissipation device and ensure a low-noise environment inside the chassis.
In addition to the position change, the BTX specification has also been re-standardized in the installation of the motherboard. The most important thing is that the BTX has an optional SRM (Support and Retention Module) support protection module, which is between the bottom of the chassis and the motherboard. A buffer, usually made of high-strength low-carbon steel, can resist strong external force and is not easy to bend, so it can effectively prevent the deformation of the main board.
In addition, there are ultra-thin, half-height, 3/4-height, full-height, vertical and horizontal chassis. 3/4-height and full-height chassis have three or more 5.25" drive bays and two 3.5" floppy drive bays. Ultra-thin cases are mainly AT cases, with only one 3.5-inch floppy drive slot and two 5.25-inch drive slots. Half-height cases are mainly Micro ATX and Micro BTX cases, which have 2-3 5.25-inch drive bays.
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