What is the concept of CPU, APU and GPU respectively?

CPU: English full called Central Processing Unit, is our traditional meaning of the processor, this concept believe that we are not unfamiliar. It is the computer's central processor, the core of a computer's computing and control core.

GPU: GPU English full name Graphic Processing Unit, Chinese translation for "graphics processor", it is the core chip inside the graphics card, so we can directly understand it for the graphics card. Now AMD and intel's processors have many integrated graphics chips, so these processors can be seen as a combination of cpu+gpu.

APU: Commonly speaking, it is the CPU and GPU through a certain technology, a high degree of integration together, synergistic computing, each other to accelerate the AMD is through such a technology, the CPU and GPU fusion together, so we will be such a processor is called APU. and at present, intel's CPU is only a simple addition to the display chip module, so strictly can not be called APU. The APU is not a new product, but it's a new way of thinking about it, and it's a new way of looking at things.

APU is short for "Accelerated Processing Units", and its Chinese name is Accelerated Processing Unit, which is a product of AMD's Fusion Idea, which for the first time puts the processor and discrete display cores on a single chip to collaborate on calculations, accelerate each other, and provide a high-performance processor and the latest DX11 discrete display support. The APU is the future development trend of the processor.

The CPU removes instructions from memory or cache memory, puts them into an instruction register, and decodes them. It breaks down the instruction into a series of micro-operations and then issues various control commands to execute the series of micro-operations, thus completing the execution of an instruction. Instructions are the basic commands of a computer that specify the type of operation to be performed and the number of operands.

An instruction consists of one or more bytes, including an opcode field, one or more fields for the address of the operand, and some status words characterizing the state of the machine, as well as a feature code. Some instructions also contain the operands themselves directly.