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When choosing a PC case, take into consideration whether you are building a general-purpose or a special-purpose computer. Where you intend to stand your computer can also determine what case you should pick. PC cases differ primarily in size, which determines their capacity to accommodate PC components.
ContinueBasic Types of Computer Cases
| Types of PC Cases | Supported Motherboard Formats | Supported Power Sources | Max. Length of Graphics Card | Positions for Fans | External 3.5" Slot Positions | External 5.25" slot Positions |
| Full Tower | eATX, ATX, mATX, mITX | ATX | 400+ mm | 10+ positions | 1-3 positions | Up to 8 positions |
| Mid Tower | ATX, mATX, mITX | ATX | 350-400mm | Up to 8 positions | 1-2 positions | Up to 5 positions |
| Mini Tower | mATX, mITX | ATX | 300-350mm | Up to 6 positions | 1-2 positions | Up to 3 positions |
| Mini ITX | mITX | SFX | 200-300mm | Up to 4 positions | 1 position | 0-1 positions |
| Desktop and HTPC | mATX, mITX | ATX, SFX, external | 150-200mm | Up to 3 positions | 1 position | 0-1 positions |
- PC cases are listed in the table from largest to smallest.
- Larger cabinets tend to circulate air more efficiently. Therefore, they are more suitable for more efficient assemblies.
- Rack cases are special mountable cases for servers.
Baseboard Format
- Select a cabinet depending on the components you will place inside.
- The eATX, ATX, mATX, mITX formats determine the size of the motherboard and thus the number of individual slots (larger cases have more slots).
 |  |  |  |
| eATX | ATX | mATX | mITX |
Internal Layout
- Internal 3.5" slots are used to place hard drives (HDDs) and SSDs (using a frame).
- Resource position - most often sources are located at the top or bottom of the cabinet. At the bottom, select the source with long enough cables to reach all the components used.
External Slots
- External 3.5" slots are used to install memory card readers and multimedia panels.
- External 5.25" slots are for optical CD/DVD/Blu-Ray drives, or panels to monitor and control fans, etc.
- Front Panel Connectors - these easily connect peripherals like a mouse, keyboard, headphones and more. Due to the presence of a front panel port, you do not need to pull the computer from the wall to connect an external drive, and simply plug it in to the front of your computer.
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PC Cases
A computer case is what gives your computer a shape and form. Without it, it would be just a pile of parts connected to each other. However, computer cases are no longer visually boring grey boxes. On the contrary - they can become the centrepiece of your room. Modern cases are available in elegant, futuristic, and minimalist designs. They are designed to ventilate the hot air that is coming out of the individual system components, and provide adequate mounting points for optical drives, hard drives, or additional fans. Many also offer easily accessible data (USB, FireWire) or audio (headphone) ports on the front panel.
Computer cases designed for normal use (office, home) are either tower cases (vertical), desktops (horizontal) or Mini-ITX. Most of them come with a preinstalled power supply unit. Rack and Server cases are for business use and for building servers.
Tower cases are categorised by size: Mini Tower, Mid Tower and Full Tower. A special feature of some Mini Tower cases is that they do not support ATX motherboards (mATX are supported). The other two sizes are compatible with both formats and provide more space for computer components. The Mini-ITX format is designed for smaller motherboards and is used when there are lower demands on the computer's performance. Barebone systems are similar and often come already partially assembled. Most have a built-in motherboard and power source unit, which slightly limits the choices of other components.
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