In theory, you can usually upgrade the CPU. The CPU of most computers is an independent component, which works on the CPU interface of the motherboard. In this case, you can upgrade the CPU. But there are also some computers whose CPU and motherboard are integrated and cannot be disassembled. If so, it is impossible to upgrade the CPU.

2. From the actual situation, it is not recommended to upgrade the CPU. Because upgrading CPU involves many factors, except slot type, core code, bus frequency, core voltage and other technical factors. The CPU that needs to be upgraded needs to be considered, as well as factors such as heat dissipation and motherboard BIOS. Only when all the requirements are met can the CPU be upgraded, but the performance improvement it brings is also very limited.

3. From the perspective of cost performance, CPU is usually more expensive, but the performance improvement of the computer is very limited. It is not recommended to upgrade the CPU.

I hope my answer can help you.