计算机中的数据处理在处理器中进行。处理器位于称为主板或印刷电路板 (PCB) 的硬件电路板中。
AT和ATX代表 Advanced Technology 主板和 Advanced Technology Extended 主板。
AT主板和ATX主板的区别：
| S. No. | Category | At motherboard | Atx motherboard |
|---|---|---|---|
| 1. | Full Form | AT motherboard stands for Advanced Technology motherboard. | ATX motherboard stands for Advanced Technology Extended motherboard. |
| 2. | Casing | It can only fit in AT casing (it cannot fit in ATX casing). | It can only fit in ATX casing (it cannot fit in AT casing). |
| 3. | Sleep Mode | It does not have a sleep mode feature. | It has sleep mode feature in it. |
| 4. | Power Drain | It has more power drain due to not having sleep mode. | It has lesser power drain because it has sleep mode. |
| 5. | Power Consumption | Power Consumption in AT motherboard is more due to non-availability of sleep mode. | Power Consumption in ATX motherboard is less due to availability of sleep mode and software-controlled switch.(It can easily convert 5 Volt to 3 Volt when necessary) |
| 6. | Power Connectors | 12-pin plugs are used to connect AT motherboard to power supply. | 20 or 24-pin plugs are used to connect ATX motherboard to power supply. |
| 7. | Other Connectors | It has only 2 other connectors: 1 outside connector, 1 DIN connector for keyboard | It has many more connectors: network card connector, video card connector, sound card connector, Modem connector. |
| 8. | Power Supply | It needs AT switch mode power supply. | It needs ATX switch mode power supply. |
| 9. | Production year | It was produced in the year 1984. | It was produced in the year 1995. |
| 10. | Produced by | It was produced by IBM. | It was produced by Intel |