CPU Definition – What Is CPU – Function Of CPU
What Is a CPU, How Works and Which Is the Function Inside Your PC
The Central Processing Unit (CPU) is the most important part of your computer known as “brain of a computer”. It is responsible for executing commands from other computer components and also for controlling them. Without a CPU the computer doesn’t work even if you push very hard the start button ?
Two popular processors manufacturers are Intel and AMD.
A processor has three parts:
Arithmetic Logic Unit (ALU) performs all arithmetic simple to hard and logical operations. Without it calculation of 2+2 will not be possible :
Control Unit (CU) is the component that is responsible to manage the other computer parts. It uses the instruction from the memory and interprets them to create a signal activating the other parts of the PC. When the calculation needs to be done, CU calls ALU to execute them.
Cache is the fastest memory from entire computer and is integrated into the CPU. In this memory is stored and accessed at high speeds the most useful data for CPU tasks.
We see the most important parts of a processor, but how the information flow through them? Transistors are the microscoping switches being able to carry the electricity (binary information). When transistors are turned on, the bits (1 or 0) can go through them and not if they are turned off. More transistors your processor have more calculations can be executed in a second. So the number of transistors is the another important criteria when you choose your processor.
CPU Clock Speed
Clock speed of a processor is the number of instruction which can be processed in one second and is measured in gigahertz (GHz). For example a processor with 1 Hz clock speed can process every second one instruction. The higher clock speed your processor has, the more instructions can be processed in one second. A processor with 3.2 Ghz clock speed can process in one second 3.2 billion instructions.
I’m pretty sure that you heard about devices or desktops with single or dual-core processor. Of course there are much more processors with multi core arhitecture (quad-core, hexa-core, octa-core). As you expected, having a dual-core processor, the number of instructions executed in one second will be doubled compared to a single-core processor.
Some processors with that feature can virtualize two cores for every physical core. So a CPU with quad-core and hyper-threading feature will function as a octa-core processor. Note that a physical core performs better than a virtual one. CPU Definition
Intel Core i3 vs i5 vs i7
As you know, considering the features that have each class, i3 is slower than i5 which is slower than i7. Every class of processors have different features to draw a line between them. Intel Core i3 has only dual-core arhitecture while i5 and i7 has quad-core . In addition i5 and i7 has the turbo boost compared to i3. The difference between i7 and i5 is that the first one have the hyper-threading feature. In conclusion, we cannot say which processor is best for all needs of user, but you can consider that each processor can run different applications. I3 can run very well multimedia, i5 will be very good in gaming and i7 can execute complicated task such redering video or 3d models.
Is very important to choose the right processor for specific tasks. For example if you are a multimedia devorator (watching films, listen music, surf the Internet) a perfect processor is i3. If you run a bit more complicated applications such games, an i5 processor will satisfy very well the tasks. And how we said in previous section an i7 is worth to be purchased because it can be used on applications based on multi-core and hyper-threading.
Another information about CPU is that it can work with 32 or 64-bit data units. Furthermore there are different types of operating systems and applications considering this classification. So 64-bit applications cannot run on 32-bit operating system.
Finally, a processor can be mounted in a specific socket that is located on motherboard. So if you are going to invest some money in a CPU, check that in the socket from your motherboard can be installed your “dream” processor…. CPU Definition