Why isnt doubling the core count, double the performance

rhythm9987 · Aug 22, 2017

Hi guys so I have a question. Why inst doubling the core count/GHz double the performance?
I saw this on some CPU reviews and the apple watch series two. Apple went from a single core to dual core but said the new watch has 50% more power compared to the old one, instead of 100%. Maybe a dumb question but i am curious.

okcnaline · Aug 22, 2017

[video="https://www.youtube.com/watch?v=S3I5WNHbnJ0"][/video]

rhythm9987 · Aug 22, 2017

okcnaline :

thanks

feelinfroggy777 · Aug 22, 2017

For such a short question, there is a very long answer.

First, there are single threaded (one core) applications and multi threaded applications (mulit core). Some applications respond well to fast single threads, such as games. While other applications, respond better to multiple threads.

So if you are using a software that only uses 1 or 2 cores, any other cores you have are just sitting in reserve not being used. So it depends on the software for core count.

Next, not all cores are created equal. This is where IPC (instructions per clock) comes into play. So if you have 2 quad core chips and one is clocked at 4ghz and the other is clocked at 4.5ghz, but the 4ghz chip has a much better IPC, then it will beat the 4.5ghz. This is why comparing clockspeeds to different architectures really does not have mean very much.

Clockspeed and Core count are just a couple of factors that impact speed of a chip, but does not tell the whole story. It is like saying a vehicle has a V8 engine and has a top speed of 120mph. Those are factors of how fast the car is, but it does not talk about suspension, gears, etc.

rhythm9987 · Aug 22, 2017

feelinfroggy777 :

For such a short question, there is a very long answer.

First, there are single threaded (one core) applications and multi threaded applications (mulit core). Some applications respond well to fast single threads, such as games. While other applications, respond better to multiple threads.

So if you are using a software that only uses 1 or 2 cores, any other cores you have are just sitting in reserve not being used. So it depends on the software for core count.

Next, not all cores are created equal. This is where IPC (instructions per clock) comes into play. So if you have 2 quad core chips and one is clocked at 4ghz and the other is clocked at 4.5ghz, but the 4ghz chip has a much better IPC, then it will beat the 4.5ghz. This is why comparing clockspeeds to different architectures really does not have mean very much.

Clockspeed and Core count are just a couple of factors that impact speed of a chip, but does not tell the whole story. It is like saying a vehicle has a V8 engine and has a top speed of 120mph. Those are factors of how fast the car is, but it does not talk about suspension, gears, etc.

I see. Thanks!

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