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is "8 core" BD really a quad core? - Page 3

post #21 of 41
Quote:
Originally Posted by Pavix View Post
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.
Windows will see 8 threads on an 8150 just like it does on a 2600K and a 2600K only has 4 cores. So are you now saying a 2600K is an 8 core processor because windows can see 8 threads?

With that being said the 8150 is technically an 8 core processor it just has a few shortcomings that handicap the "AMD Cores" or "Modules".
post #22 of 41
Here's a diagram of a single BD module (courtesy of Anandtech)



The "Int Schedulers" are essential physical cores for which there are clearly two. The "FP Scheduler" is the floating point unit (anyone remember FPUs) and it is shared by the two cores, though it has within it two FMACs (but it's still considered a single FPU). Thus there really are 8 physical cores in a 8150, though they appear to be crippled by resource sharing, as noted in the diagram (I find the shared instruction fetch and decode somewhat weird). I imagine that AMD could develop a compiler and OS scheduler that could leverage the strengths of BD (and demonstrate that it's a contenter), but as of now the opposite seems to be true: comtemporary compilers and OSs hit all the BD weaknesses. Such a gamble for AMD, maybe BD archecture is really 'ahead of its time' and the world isn't ready for it yet (this is a joke BTW).
Edited by *AcidBath* - 10/17/11 at 12:57pm
post #23 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.
Nope, Bulldozer only has one FPU per module, and therein is where some of the problems regarding its performance lie, among others to do with it's rather different architecture.
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post #24 of 41
The short comeings of BD sound a lot like the short comeings
Of the first Intel duel core (Pentium D) were the core communicated across the NB chip

sent my EVO shift
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post #25 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?
Eight "real" slow cores, which is why people are discussing this. It's hard for anyone to grasp how eight cores can only be 5-10% faster than four in heavy multithreading.
    
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post #26 of 41


AMD's own patent. Notice CORE at the top and clusters inside.

4c/8t part.

Done.
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post #27 of 41
Quote:
Originally Posted by Dmac73 View Post
AMD's own patent. Notice CORE at the top and clusters inside.

4c/8t part.

Done.
I just don't think the single thread/four thread performance is there to really call it a 4c/8t part.

It's different than HT, HT only adds a bit more performance at the top, while keeping the base performance the same. Bulldozer is slow from 1-8 threads, where as a processor using HT is faster from 1-4, then slows way down after the 4th thread.


To me HT, or 4c/8t insinuates there is greater performance when using 4t or less, which isn't really the case with bulldozer.
Edited by BallaTheFeared - 10/17/11 at 2:27pm
    
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post #28 of 41
Quote:
Originally Posted by BallaTheFeared View Post
I just don't think the single thread/four thread performance is there to really call it a 4c/8t part.

It's different than HT, HT only adds a bit more performance at the top, while keeping the base performance the same. Bulldozer is slow from 1-8 threaders, where as a processor using HT is faster from 1-4, then slows way down after the 4th thread.
But were not talking performance. We're talking tech terms. 4c/8t doesn't automatically mean its anything like HT. These new clusters in my opinion, aren't performing bad considering how narrow they are. Is it good for 2011 in an overall stance? Not even close.

It is what it is.
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post #29 of 41
It can't be 4c/8t cpu, it has dedicated integer cores for each thread, a 4c/8t cpu doesn't.
    
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post #30 of 41
Quote:
Originally Posted by BallaTheFeared View Post
It can't be 4c/8t cpu, it has dedicated integer cores for each thread, a 4c/8t cpu doesn't.
Chew* and AMD engineers agree it's a 4c/8t part. I'll go with them.
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