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PostPosted: Wed Apr 24, 2013 2:21 pm 
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I'm sure this is very basic.

If a piece of software need a 2.8ghz processor to work would any kind of multi core processor work below 2.8ghz. For example a 2.2ghz dual core? Or would the dual cores both have to be 2.8ghz in order to run it?

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PostPosted: Wed Apr 24, 2013 2:40 pm 
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2.8 ghz would be the total speed needed, not the amount needed by each core.


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PostPosted: Wed Apr 24, 2013 2:42 pm 
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Errkal wrote:
2.8 ghz would be the total speed needed, not the amount needed by each core.


Cool so technically a dual core 2.2ghz has a a total speed of 4.4ghz?

Basically my dad needs one for the new paye software but it needs a 2.7ghz processor.

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PostPosted: Wed Apr 24, 2013 2:44 pm 
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Exactly. the 2.2 is speed each core runs at.


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PostPosted: Wed Apr 24, 2013 2:46 pm 
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Errkal wrote:
Exactly. the 2.2 is speed each core runs at.


Thanks, I was trying to search for the answer but couldn't find anything that answered the question, just loads of stuff about multi tasking and two processors running at once.

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PostPosted: Thu Apr 25, 2013 12:04 pm 
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Return_of_the_STAR wrote:
I'm sure this is very basic.

If a piece of software need a 2.8ghz processor to work would any kind of multi core processor work below 2.8ghz. For example a 2.2ghz dual core? Or would the dual cores both have to be 2.8ghz in order to run it?

Strictly speaking the speed is irrelevant. Even if a CPU doesnt meet the minimum speed requirements it should still run.

Whether it runs well or not, thats a whole 'nother can of worms. The system requirements should give you an idea of what you'll need to run a piece of software at an acceptable speed. But "acceptable" is one of those eye of the beholder things.


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PostPosted: Fri Apr 26, 2013 8:49 am 
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Return_of_the_STAR wrote:
Errkal wrote:
2.8 ghz would be the total speed needed, not the amount needed by each core.


Cool so technically a dual core 2.2ghz has a a total speed of 4.4ghz?

Basically my dad needs one for the new paye software but it needs a 2.7ghz processor.


No this isnt true.

2 x 2.2ghz core != 4.4ghz

It means you have 2 cores operating at 2.2ghz. They dont 'pool' their resources like that. That would assume that whatever the app is is perfectly multithreaded and utilises both cores for whatever it is doing.

This was a trick that vendors used in the early days of multicore cpus; "this new machine with a 12.4ghz cpu!". Nah, not how it works Im afraid. Should be ashamed of yourself Errkal, I thought you were a pro.

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PostPosted: Fri Apr 26, 2013 9:01 am 
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Falsey wrote:
Return_of_the_STAR wrote:
Errkal wrote:
2.8 ghz would be the total speed needed, not the amount needed by each core.


Cool so technically a dual core 2.2ghz has a a total speed of 4.4ghz?

Basically my dad needs one for the new paye software but it needs a 2.7ghz processor.


No this isnt true.

2 x 2.2ghz core != 4.4ghz

It means you have 2 cores operating at 2.2ghz. They dont 'pool' their resources like that. That would assume that whatever the app is is perfectly multithreaded and utilises both cores for whatever it is doing.

This was a trick that vendors used in the early days of multicore cpus; "this new machine with a 12.4ghz cpu!". Nah, not how it works Im afraid. Should be ashamed of yourself Errkal, I thought you were a pro.


Meh, hardware ain't my thing :P


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PostPosted: Sun Apr 28, 2013 10:38 pm 
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Indeed. Also some (bad) software will not utilise more than one core at all, so whether a CPU has two or four cores it will still struggle if they each core runs below the recommended speed.

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PostPosted: Sun Apr 28, 2013 10:55 pm 
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Falsey wrote:
Return_of_the_STAR wrote:
Errkal wrote:
2.8 ghz would be the total speed needed, not the amount needed by each core.


Cool so technically a dual core 2.2ghz has a a total speed of 4.4ghz?

Basically my dad needs one for the new paye software but it needs a 2.7ghz processor.


No this isnt true.

2 x 2.2ghz core != 4.4ghz

It means you have 2 cores operating at 2.2ghz. They dont 'pool' their resources like that. That would assume that whatever the app is is perfectly multithreaded and utilises both cores for whatever it is doing.

This was a trick that vendors used in the early days of multicore cpus; "this new machine with a 12.4ghz cpu!". Nah, not how it works Im afraid. Should be ashamed of yourself Errkal, I thought you were a pro.

Depends. If you had software that used multiple cores perfectly then a programme that took an hour on a 2.2ghz processor would take half an hour on a 2 core 2.2ghz processor, or half an hour on a 4.4ghz processor.

But they had to stop saying it because programmes aren't that perfect and there are other bottlenecks that prevent that from happening.


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PostPosted: Tue Apr 30, 2013 12:32 pm 
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Isnt that literally what I said?

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PostPosted: Wed May 01, 2013 6:42 am 
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Falsey wrote:
Isnt that literally what I said?


Yes.

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PostPosted: Thu May 02, 2013 3:38 pm 
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Falsey wrote:
Isnt that literally what I said?


Pretty much. I think I must have only read the 2 x 2.2 != 4.4 line

I blame tiredness for this oversight.


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PostPosted: Thu May 02, 2013 5:57 pm 
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Return_of_the_STAR wrote:
If a piece of software need a 2.8ghz processor to work would any kind of multi core processor work below 2.8ghz. For example a 2.2ghz dual core? Or would the dual cores both have to be 2.8ghz in order to run it?


They're most likely referring to the 2.8GHz Intel Pentium 4, a CPU that was released in 2002 and is often set as the minimum system requirement for a variety of software.

A modern 2.2GHz single core would be multiple times faster than a 2.8GHz Pentium 4, so you should be fine.


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PostPosted: Thu May 02, 2013 8:42 pm 
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The other problem I don't think people have mentioned is that different processors architectures will have different levels of performance so for example a 3.6Ghz pentium 4 will not be as fast as 2.6 Ghz i7 for example.

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PostPosted: Fri May 03, 2013 1:49 am 
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lex-man wrote:
The other problem I don't think people have mentioned is that different processors architectures will have different levels of performance so for example a 3.6Ghz pentium 4 will not be as fast as 2.6 Ghz i7 for example.


Did you read the post above you before you posted?

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