WEBVTT

00:00:00.080 --> 00:00:05.440
we've gotten used to throwing around the term CPU core the part of your processor

00:00:04.000 --> 00:00:10.000
that does the actual you know processing we understand that

00:00:07.919 --> 00:00:14.719
more cores are usually better especially for applications like video editing but

00:00:12.080 --> 00:00:19.680
what exactly makes a core different from the rest of the CPU and how exactly do

00:00:17.279 --> 00:00:24.720
they work it's probably useful to first define what a core is not

00:00:22.080 --> 00:00:28.800
cores don't handle io or input output from the rest of the system as there's a

00:00:26.880 --> 00:00:33.040
separate part of the CPU die that deals with that nor do they provide you with

00:00:31.039 --> 00:00:37.680
the graphics that is the responsibility of an integrated GPU which also sits on

00:00:35.520 --> 00:00:42.239
a different part of the die so now let's look at what a core does do by talking

00:00:39.920 --> 00:00:46.640
about the different parts of a core let's start out with the alu or

00:00:44.239 --> 00:00:49.920
arithmetic logic unit the alu does exactly what it sounds like it's the

00:00:48.079 --> 00:00:54.160
part of your computer that does the thinking more specifically it handles

00:00:52.239 --> 00:00:58.239
mathematical operations and also carries out logical operations such as comparing

00:00:56.399 --> 00:01:01.840
different values although this might make the alu sound like a fancy

00:01:00.000 --> 00:01:06.240
calculator the programming languages that enable everything you do on your

00:01:03.440 --> 00:01:11.040
computer rely on math and formal logic that the alu can understand cores often

00:01:08.960 --> 00:01:15.360
also have a floating point unit which is similar to an alu but deals with number

00:01:13.439 --> 00:01:18.240
sets that have their decimal points in different places and you can learn more

00:01:16.960 --> 00:01:23.360
about what this means and why it's important in this video right up here

00:01:20.720 --> 00:01:28.720
but how do the alu and the fpu know what to work on well data is fed to

00:01:26.240 --> 00:01:33.680
these units by registers these are temporary holding places for whatever

00:01:30.720 --> 00:01:37.759
the CPU core has to process next one type of register called an input

00:01:35.600 --> 00:01:42.079
register holds the data that the CPU needs to process while another type of

00:01:39.680 --> 00:01:46.960
register called an instruction register tells the CPU what to do with that data

00:01:44.960 --> 00:01:51.439
so if the system needs to multiply six and three it will place six and three

00:01:49.040 --> 00:01:55.040
into the input registers and a multiply instruction into the instruction

00:01:52.960 --> 00:01:58.960
register we'll tell you more after this message from our sponsor secret lab

00:01:57.119 --> 00:02:03.360
secret lab chairs are engineered to keep you incredibly comfortable for long

00:02:00.560 --> 00:02:07.680
hours at work or play their new titan evo 2022 chair keeps you feeling

00:02:05.759 --> 00:02:12.160
comfortable for longer hours with their 4-way lumbar support ultra-comfortable

00:02:10.080 --> 00:02:15.920
line of different seat material and more all chairs come with an up to 5-year

00:02:13.760 --> 00:02:19.040
extended warranty and 49-day return policy head to the link in the

00:02:17.200 --> 00:02:24.080
description and check out secret lab today the alu will then figure out the

00:02:21.599 --> 00:02:28.720
product 18 in this case and send the result to yet another part of the core

00:02:26.319 --> 00:02:33.200
called an accumulator the accumulator then sends the result to

00:02:31.200 --> 00:02:36.879
the cash which is a small amount of extremely fast memory built into each

00:02:36.000 --> 00:02:42.879
core this data can then be read by the program that requests it and by the way

00:02:40.720 --> 00:02:46.480
the cache sends data the other direction as well specifically it holds the data

00:02:44.959 --> 00:02:50.640
and the instruction the CPU has to process and execute before that data

00:02:48.720 --> 00:02:54.879
enters the alu now at the beginning of all this the data is initially fetched

00:02:52.560 --> 00:02:59.760
from your main system RAM but having it in the cache before the cores need to

00:02:56.720 --> 00:03:01.760
process it makes your pc run much faster

00:02:59.760 --> 00:03:05.920
once the CPU core finishes working on one instruction it of course has to move

00:03:03.599 --> 00:03:10.080
on to the next one so another part of the core is called the instruction

00:03:07.920 --> 00:03:13.760
pointer it contains the location in memory where the CPU should load the

00:03:12.080 --> 00:03:17.920
next instruction from but what ties all of it together

00:03:16.560 --> 00:03:23.360
to find the answer out we actually have to go outside the cores themselves the

00:03:20.720 --> 00:03:28.400
CPU features a memory management unit or mmu that's separate from the cores that

00:03:25.920 --> 00:03:33.440
directs the data that flows between RAM and the CPU cores kind of like a traffic

00:03:30.480 --> 00:03:36.879
cop and the CPU die also has a control unit that manages the cores by

00:03:35.120 --> 00:03:42.000
synchronizing their different parts so that they work together fluidly to do so

00:03:39.680 --> 00:03:46.799
the control unit uses a clock signal that runs at a specific clock rate that

00:03:44.560 --> 00:03:51.440
same number you see on your CPU or computer's label given in gigahertz or

00:03:49.120 --> 00:03:54.720
billions of clock cycles per second fast enough to help you watch this video

00:03:53.280 --> 00:03:58.480
so hopefully now you understand the difference between a CPU core and the

00:03:56.720 --> 00:04:03.680
other parts of your processor and we know this is a very simplified high

00:04:00.400 --> 00:04:06.239
level overview of a very complicated

00:04:03.680 --> 00:04:09.599
device like a CPU we don't exactly have time to get into a whole phd

00:04:07.599 --> 00:04:12.720
dissertation here on techwiki but maybe you'll find one of those down

00:04:11.120 --> 00:04:16.400
in the comments so thanks for watching guys if you like this video hit like hit

00:04:14.239 --> 00:04:21.840
subscribe and hit us up in the comments with your suggestions for topics that we

00:04:18.479 --> 00:04:21.840
should cover in the future