Let’s talk about what a CPU is. Most people don’t really know what’s going on under the hood of the computer.
What is a CPU? (Processor Definition)
A central processing unit (CPU), also called a processor, is basically a powerful calculator that is located on the system board (motherboard), where it is connected to the rest of the hardware components within the system. The CPU is often referred to as the brain of the computer because it is where all of the programs are executed.
If you're upgrading your CPU or need to ensure compatibility with your motherboard, our server configurator can help you find the right components quickly and easily.
How does a CPU work?
How does a CPU work? Produkter Services Levering Om os When an operating system begins to run a program, it will 01 send an instruction via the address bus to the Random Access Data and data back to the Control Unit in side the CPU via the data bus
This first phase is called fetch which is part of the basic function called the fetch-execute cycle, where the CPU will fetch an instruction, decode it, and then execute it.
The CPU will repeat this in a loop billions of times persecond until there are no more instructions to fetch. This basically means that the memory provides the instructions, and the CPU reads them.
All the CPUs are synchronized to a clock, and the CPU will go through each of the phases, fetch, decode, execute, and then start the next clock tick, which keeps the instructions moving in a sequence.
The amount of clock cycles a CPU can process depends on the processor. The higher the clock speed, the faster the CPU can process data.
The CPU carries out this cycle repeatedly millions of times per seconds.
The fetch-execute cycle
The basic function of a processor is called the fetch-execute cycle. This function consists of three phases; fetch, decode, and execute.
Fetch
Firstly, the CPU fetches the instruction from the memory.
Decode
Then the instruction is decoded so the CPU knows what to do with the data.
Execute
Finally, the data is processed, and the instruction is executed. The instruction can be a single action or a sequence of actions, depending on the action. The result is then either stored temporarily in an internal CPU register or transported back to a new addresson the RAM.
Parts of the CPU
The Control Unit
This control unit receives and manages the instructions from RAM. It fetches, decodes and executes instructions.
Arithmetic Logic Unit
The Arithmetic Logic Unit (ALU) performs all of the mathematical operations inside the CPU.
Clock
Most CPUs have a clock, on each clock tick, the CPU will fetch an instruction, decode the instruction, and execute the instruction in a loop.
Buses
A bus is a high-speed internal connection located on the system board that is used to transfer data between hardware components, in this case, the CPU and RAM.
Types of buses
- Address bus
- Data bus
- Control bus
Cache
Cache is a built in RAM module that allows the CPU to temporarily store data that it is likely going to reuse. This allows the CPU to store data within the processor instead of having to fetch the same data repeatedly.
Registers
The CPU uses small registers to temporarily store data which are used for various reasons. The most common registers are Program Counter (PC), Memory Address Register (MAR), Memory Data Register (MDR), Current Instruction Register (CIR), and Accumulator (ACC).
The central processing unit has come a long way since the first commercially available microprocessor (The Intel 4004) was released by the Intel Corporation in 1971. The Intel 4004 chip was clocked at 740 kHz and it was capable of executing 92,000 instructions per second. Today, the clock speed is measured in GHz and the CPUs are capable of executing billions of instructions per second.
Types of CPU
Since then, the commercial hunger for CPUs has grown, which has resulted in increased competition in developing better and faster central processing units. Today, it is The Intel Corporation and the company Advanced Micro Devices (AMD) which are the largest distributors of CPUs.
Single-core CPU
This is the oldest type of CPU. A single-core CPU is very slow, and it is only able to execute one instruction at a time. The first single-core CPU was the Intel 4004 and it was manufactured by the Intel Corporation in 1971.
Dual-core CPU
In 2001, the first dual-core processor was introduced by IBM (International Business Machines Corporation). The POWER4 CPU was the first multi-core processor that was able to read and execute instructions simultaneously on two separate processing units.
Quad-core CPU
In 2006, the Core 2 Quad processor was introduced by Intel. The quad-core had two dual-core processors within a single processor.
The speed of how many cores can be added to a processor is increasingly growing. But it is not all systems that need to be upgraded with the newest CPU with the highest amount of cores. Many servers can operate perfectly fine with older processors.
At Renewtech, we purchase pre-owned CPUs and refurbish them so they can be used again. If your company is looking to purchase older generations that are no longer being produced, then you are welcome to browse through our stock of refurbished CPUs, we carry all of the major brands in our inventory. We ship them directly from our own warehouse. Feel free to contact us if you have any questions regarding our products