系统单位：
System Unit是PC系统的硬件元素。它的大小各不相同，并且每个特定的 PC 类型及其工作需求都具有完全不同的大小。它也被称为系统追逐、电脑机箱、电脑机箱等。
系统单元包含光驱、硬件、RAM、电源、BIOS、主板、处理器、风扇、外围设备等。它本身不是一个有目的的单元，但它为所有或任何相反的有目的的单元和内部提供了环境进行协作并在一个非常普通的硬件追逐中协同工作。它有时由铝或通常是金属制成。它的形式和大小因 PC 或计算机的需要而异。
中央处理单元(CPU)：
CPU 被称为每个根深蒂固的系统的大脑。 CPU 包括用于快速存储信息和执行计算的算术逻辑单元 (ALU) 和用于执行指令排序和分支的控制单元 (CU)。 CPU 与更多的计算机组件(例如内存、输入和输出)交互以执行指令。
让我们看看 System unit 和 CPU 之间的区别：
| S.NO | System Unit | CPU |
|---|---|---|
| 1. | System Unit does not have any full form. | CPU stands for Central Processing Unit. |
| 2. | It manages the entire or whole computer. | Whereas it is the part of system unit. |
| 3. | Without CPU system unit is nothing. | It is the heart or brain of system unit. |
| 4. | It is not responsible for giving the answer or solution of queries. | While it is responsible for giving the answer or solution of queries. |
| 5. | System unit is the computer system’s part or unit. | Whereas it is the small unit of system unit. |
| 6. | System unit contains or provides the power supply to the entire computer system. | While it does not have power supply. |
| 7. | System unit contains optical drive, hardware, RAM, power supply, BIOS, motherboard, processors, fans, peripheral devices, etc. | Whereas it contains microprocessor, that process data. |