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Is this correct?

post #1 of 7
Thread Starter 
Quote:
A Quad-Core CPU running at 4.0Ghz,

Is equivalent in Multi-threaded application to an Octo-Core running at 2.0Ghz,

And is twice as powerful in Single-threaded applications.
If not, why not?
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post #2 of 7
It is. It is twice as fast for up to quad thread apps. Over that it slows down to the performance of the 8-core for 8 threads and above.
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post #3 of 7
Quote:
Originally Posted by ronnin426850 View Post
It is. It is twice as fast for up to quad thread apps. Over that it slows down to the performance of the 8-core for 8 threads and above.
Interesting one.

Why would it be twice as fast for quad thread apps?
Since the quad core is clocked higher, I would think the quad is better for stuff up to quad thread apps?
Also, why would the octo core be twice as fast in single thread applications?
I'm newb here.
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post #4 of 7
It would be twice as fast in single-threaded applications because it's clocked twice as high. Single-threaded applications don't take advantage of multi-core processors so the only thing that matters to those applications is clock speed.

EDIT: After reading the original post again I've officially confused myself.
Edited by Blue6228 - 4/9/11 at 6:04am
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post #5 of 7
Thread Starter 
Quote:
Originally Posted by vinton13 View Post
Interesting one.

Why would it be twice as fast for quad thread apps?
Since the quad core is clocked higher, I would think the quad is better for stuff up to quad thread apps?
Also, why would the octo core be twice as fast in single thread applications?
I'm newb here.
You've got it half-backwards. No worries, though

We're all about nurturing.. and diversity!

The Quad-Core has 4 cores working at 4.0Ghz.
So, if you have an application that uses only 4 cores (8 threads), each thread will get the full 4.0Ghz speed.
On the other hand, the Octo-Core has 8 cores working at 2.0Ghz.
So, if you have an application that uses only 4 cores (8 threads), only half the CPU will be utilized, which means 2.0Ghz per thread.
That's half the performance.

In the same way, an Octo-Core will be half as fast at single-threaded applications, because it's power comes from having many threads and if they're not all being used, a CPU with less threads but clocked higher would obviously be faster.
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post #6 of 7
Quote:
Originally Posted by vinton13 View Post
Interesting one.

Why would it be twice as fast for quad thread apps?
Since the quad core is clocked higher, I would think the quad is better for stuff up to quad thread apps?
Also, why would the octo core be twice as fast in single thread applications?
I'm newb here.
No, no, see:

For 1, 2, 3 or 4 threads: Quad @4Ghz = 2xOcto @2Ghz
For 5, 6 or 7 threads: Quad @4Ghz = between 1.9 and 1.1 xOcto @2Ghz
For 8+ threads: Quad @4Ghz = Octo @2Ghz.

BECAUSE:
For 4 threads, the QUad will have all 4 cores running at max speed (4Ghz) and will perfrorm the task in "n" time.
For 4 threads, the Octo will have 4 cores doing nothing and 4 cores running at half speed (2Ghz) and will perform the task in "n/2" time.

For 8 threads, the QUad will have all 4 cores running at max speed (4Ghz) and swithcing between 2 separate threads, giving 2Ghz each, and will perform the task in "p" time.
For 8 threads, the Octo will have 8 cores, 1 thread each, still running at 2Ghz, giving 2Ghz to each thread, completing the task in "p" time (like the quad).

The 5-7 threads situation is in between, where the Quad will have too many threads, and the Octo will have idle cores.
Edited by ronnin426850 - 4/9/11 at 6:08am
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post #7 of 7
Ohhhh! I understand! Thanks guys!

Oh, how you learn from this site.
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