The computer tower cases hold all the components inside the system unit such as motherboard, CPU, RAM, hard drive, DVD drive, etc. The normal cases have three or four 5.25" drive bays and two 3.25-inch driver bays except some special purpose cases.
Most computer tower cases nowadays have different size and color that come with flexible front panel I/O: USB, Mic and Audio ports.
USB ports - All our cases feature at least two front (or side) USB connections, allowing you to connect a USB device directly to the case, rather than connecting it to the back of the PC. Mic port - enable you to plug in the microphone on the front panel of the chassis. Audio port - to plug-in the speakers so that the sound can come out from the speakers.
What is included when you buy a case?
You should expect the following three things when you buy a computer case:
Power Supply Unit (PSU) but some cases exclude the PSU.
Power cord - use to connect the Power Supply Unit to the multiple socket outlets to supply the power to the entire computer.
Screws and nuts - use to tighten the components that attach to the computer case such as motherboard, HDD, DVD-RW drive, display adapter, etc.
How to choose a case?
Cost and Warranty - While compare the case prices, remember that the cost to ship a case can be substantial. Also, the warranty periods offer by the computer stores.
The correct form factor - The ATX form factor will be ideal
Plan for expansion - Choose a case that leaves at least one or two bays for possible later expansion such as DVD drives.
Buy case and power supply separately, if necessary - especially if you prefer the high-end PSU.
Add supplemental cooling fans - to minimize temperature inside the case.
Sizes and shapes - Normal size and choose the shape that you like including the color.
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