ATX PS/2 refers to the most common form factor for power supply units (PSUs) used in desktop computers. It is widely considered the "standard ATX PSU".
The ATX PS/2 form factor is the most popular type of power supply unit found in personal computers. It's often referred to simply as the "standard ATX PSU" because of its prevalence in ATX-compatible cases.
This form factor defines the physical dimensions of the power supply, ensuring compatibility with a vast majority of standard ATX PC cases.
Standard Dimensions of ATX PS/2 PSUs
The reference specifies the standard dimensions for this popular PSU form factor:
- Width (W): 150mm
- Height (H): 86mm
- Depth (D): 140mm
However, it's important to note that while 140mm is the standard depth, the reference indicates that PSUs with a depth longer than 140mm can still be considered an ATX PS/2 model. This allows manufacturers some flexibility in design, often to accommodate larger fans or higher wattage components, while maintaining compatibility with many cases designed for the ATX PS/2 standard.
Why is ATX PS/2 Standard?
The ATX form factor, introduced by Intel, standardized many aspects of PC design, including motherboard layout, case dimensions, and power supply specifications. The ATX PS/2 form factor specifically defined the physical size and mounting points for the PSU, making it easy for case and PSU manufacturers to create compatible products.
- Interchangeability: Users can easily replace or upgrade their power supply with any ATX PS/2 unit, regardless of the original manufacturer, as long as the wattage and connectors meet their system's needs.
- Wide Availability: Due to its standardization, ATX PS/2 PSUs are the most readily available and often the most affordable option.
- Case Compatibility: Most desktop computer cases are designed to accommodate ATX PS/2 power supplies.
Understanding PSU Form Factors
While ATX PS/2 is the standard, other PSU form factors exist for different types of computers or specialized cases, such as:
- SFX (Small Form Factor)
- TFX (Thin Form Factor)
- Flex ATX
Choosing the correct PSU form factor is crucial for compatibility when building or upgrading a PC. Always check the specifications of your computer case to ensure the power supply you purchase will fit.
Summary of ATX PS/2 Characteristics
| Characteristic | Description |
|---|---|
| Popularity | Most popular PSU form factor ("standard ATX PSU") |
| Standard Width | 150mm |
| Standard Height | 86mm |
| Standard Depth | 140mm |
| Depth Variation | Can be longer than 140mm and still be ATX PS/2 |
| Compatibility | Designed for standard ATX computer cases |
In conclusion, ATX PS/2 is the defining physical standard for the power supply unit in most desktop PCs, known for its common dimensions and widespread compatibility.
