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we've gotten used to throwing around the term CPU core the part of your processor

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that does the actual you know processing we understand that

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more cores are usually better especially for applications like video editing but

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what exactly makes a core different from the rest of the CPU and how exactly do

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they work it's probably useful to first define what a core is not

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cores don't handle io or input output from the rest of the system as there's a

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separate part of the CPU die that deals with that nor do they provide you with

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the graphics that is the responsibility of an integrated GPU which also sits on

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a different part of the die so now let's look at what a core does do by talking

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about the different parts of a core let's start out with the alu or

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arithmetic logic unit the alu does exactly what it sounds like it's the

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part of your computer that does the thinking more specifically it handles

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mathematical operations and also carries out logical operations such as comparing

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different values although this might make the alu sound like a fancy

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calculator the programming languages that enable everything you do on your

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computer rely on math and formal logic that the alu can understand cores often

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also have a floating point unit which is similar to an alu but deals with number

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sets that have their decimal points in different places and you can learn more

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about what this means and why it's important in this video right up here

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but how do the alu and the fpu know what to work on well data is fed to

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these units by registers these are temporary holding places for whatever

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the CPU core has to process next one type of register called an input

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register holds the data that the CPU needs to process while another type of

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register called an instruction register tells the CPU what to do with that data

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so if the system needs to multiply six and three it will place six and three

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into the input registers and a multiply instruction into the instruction

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register we'll tell you more after this message from our sponsor secret lab

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description and check out secret lab today the alu will then figure out the

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product 18 in this case and send the result to yet another part of the core

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called an accumulator the accumulator then sends the result to

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the cash which is a small amount of extremely fast memory built into each

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core this data can then be read by the program that requests it and by the way

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the cache sends data the other direction as well specifically it holds the data

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and the instruction the CPU has to process and execute before that data

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enters the alu now at the beginning of all this the data is initially fetched

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from your main system RAM but having it in the cache before the cores need to

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process it makes your pc run much faster

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once the CPU core finishes working on one instruction it of course has to move

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on to the next one so another part of the core is called the instruction

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pointer it contains the location in memory where the CPU should load the

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next instruction from but what ties all of it together

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to find the answer out we actually have to go outside the cores themselves the

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CPU features a memory management unit or mmu that's separate from the cores that

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directs the data that flows between RAM and the CPU cores kind of like a traffic

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cop and the CPU die also has a control unit that manages the cores by

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synchronizing their different parts so that they work together fluidly to do so

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the control unit uses a clock signal that runs at a specific clock rate that

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same number you see on your CPU or computer's label given in gigahertz or

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billions of clock cycles per second fast enough to help you watch this video

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so hopefully now you understand the difference between a CPU core and the

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other parts of your processor and we know this is a very simplified high

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level overview of a very complicated

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device like a CPU we don't exactly have time to get into a whole phd

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dissertation here on techwiki but maybe you'll find one of those down

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in the comments so thanks for watching guys if you like this video hit like hit

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subscribe and hit us up in the comments with your suggestions for topics that we

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should cover in the future