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is "8 core" BD really a quad core? - Page 2

post #11 of 41
Quote:
Originally Posted by Malcolm View Post
CPU-Z shows 8 cores/8 threads, so I would assume it's 8 "real" cores?
It's a moduled design where you have 4 modules in the 8150 which are supposed to be equivilent to 8 cores i.e 2 cores per module, but it's not quite the truth.

Simply put you get 1.5 "Cores per module".
post #12 of 41
Yep, FX8150 runs 8 cores, each with 1 thread. i7 2600k, runs 4 cores with 8 threads.

Imagine how awesome if FX8150 had 8 cores, 16 threads
    
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post #13 of 41
Quote:
Originally Posted by thrasherht View Post
The key part that makes up a core is the actual processing unit inside the core, so since each module has two FPUs in it, that is 2 cores. So yes, 8 cores.
Actually, no.

It has ONE FPU per module. It has two ALUs and two FMACs per module though.


The fact of not having two FPUs per module is why the per-core IPC is so low when running all the eight threads; and it's also the reason why IPC increases so dramatically when one core per module is disabled.
   
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post #14 of 41
Thread Starter 
http://techreport.com/articles.x/19514

that article finally explains what's going on...

Intel and older AMD processors do CMP, or traditional "moar cores" whereas Bulldozer fused two cores together and makes them share with each other into a module.
     
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post #15 of 41
don't listen to them. he can beat i5 at all ... but still i7series are the best cpu's in the world ...
    
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post #16 of 41
Quote:
Originally Posted by ChronoBodi View Post
there's all the media talk of "OMG 8 core loses to intel 4 core!"

I think that's not really correct, should it be 4 modules vs 4 cores? But then again they look at the Bulldozer and are like "WOAH 8 cores!"
So I guess Newegg is lying.

http://www.newegg.com/Product/Produc...960&Tpk=FX8150

"World’s First 8-core Desktop CPU"
post #17 of 41
Quote:
Originally Posted by _s3v3n_ View Post
So I guess Newegg is lying.

http://www.newegg.com/Product/Produc...960&Tpk=FX8150

"World’s First 8-core Desktop CPU"
By classification it's an 8 core processors, but it's not as clear cut as that.

It has 4 modules and each module can be considered 2 cores. But instead of having 2 cores which have their own resources you have 1 module with 2 "cores" that have to share resources within the module. Which leads to a decrease in performance.

PCPer did a test where they ran a benchmark using 2 "cores". 1st test was ran with two "cores" on the same module and the 2nd test was ran with two "cores" from seperate modules (2 modules, one "cores" each).

The 2nd test was faster because each core had it's own resources and didn't have to share resources.
post #18 of 41
Thread Starter 
Quote:
Originally Posted by jackbrennan2008 View Post
By classification it's an 8 core processors, but it's not as clear cut as that.

It has 4 modules and each module can be considered 2 cores. But instead of having 2 cores which have their own resources you have 1 module with 2 "cores" that have to share resources within the module. Which leads to a decrease in performance.

PCPer did a test where they ran a benchmark using 2 "cores". 1st test was ran with two "cores" on the same module and the 2nd test was ran with two "cores" from seperate modules (2 modules, one "cores" each).

The 2nd test was faster because each core had it's own resources and didn't have to share resources.
so it's basically physical hyperthreading?
     
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post #19 of 41
Quote:
Originally Posted by ChronoBodi View Post
so it's basically physical hyperthreading?
No, hyperthreading is physical hyperthreading. This is sharing an FPU between two cores.

Hyperthreading
Quote:
Hyper-threading works by duplicating certain sections of the processor—those that store the architectural state—but not duplicating the main execution resources. This allows a hyper-threading processor to appear
AMD took the idea to a new step, but didn't quite hit the note they were going for.
    
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post #20 of 41
I see this discussion alot, to me a core is something identified via the OS, if Windows sees 8 cores then it has 8 cores irregardless of the shortcomings of shared resources. If I had a nickle for everytime I read someone say "don't compare BD to a 2600 because BD doesnt have 8 cores" I could buy AMD. If AMD does not want to compete with 8 core CPU's, even one's with 4 physical cores and 4 virtual ones, then it shouldnt put "8 core" on their boxes.
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