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Do the new AMD octo-core truly have 8 cores?

post #1 of 18
Thread Starter 
This might seem like a noob question, but I am not so tech-savvy when it comes to hardware. I'm a back end web developer and for the last few months I have been planning on building a new machine.

I came onto overclock.net a month or so ago to get advice for this proposed build and got some great advice about waiting for Bulldozer to see how that chip stacks up (something I would have never thought of on my own). So, I waited....

Alas, the Bulldozer is here and the reviews aren't so glowing. However, while researching the new chip, I believe that someone told me that AMD's Bulldozer isn't truly a octo-core chip, but instead something more likened to a quad-core with a form of hyper-threading technology (not really HT, but sort of like HT). Yeah, it confused me too.

However, I can't seem to find a solid answer to this in laymen's terms. If this is really the case, then why can't I find a solid answer on this? Why isn't Tom's or any of the other reviewers spelling this out in laymen's terms?

I have been reading about the FX octo-cores having only four modules, but do modules = cores? If so, then why not just call them cores and if not, then how does a module differ from a core?

Can someone please clear [or sum] this up for me?

Thanks...
Edited by airspoon - 10/16/11 at 10:46am
post #2 of 18
What does the manufacturer claim ?? BTW BD seems to work pretty good with certain tasks. See if anyone has used the software you use and make a decision. CPU purchase should be based on workload.
post #3 of 18
It's basically 4 cores, with physical hyperthreading. Or 4 modules with 8 half cores (2 half cores per module), however you want to look at it. It's not 8 actual cores.
    
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post #4 of 18
hiya and welcome .

the cores aren't as conventional as intel's or other older AMD cores: basically the prevailing idea as i understand it is that it is shown as an 8-core chip, but the cores are made up of modules - these then make up a core. shows up as 8 cores in task manager though.

however, since a lot of apps and even win7 don't know how to use the chip properly, it's not quite as consistent in performance and it'd end up behaving more like a quad (better explained above)

may well be wrong though so if i am someone will no doubt correct me
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post #5 of 18
Quote:
Originally Posted by airspoon View Post
Do the new AMD hexa-core truly have 8 cores?
Do you mean if the hexacore(6core) bulldozer chips will unlock to 8core?
We dont know yet because the hexacore(6core) variants of the bulldozer chip still hasnt come out.

I think you got a bit confused.
Hexacore = 6 cores not 8
Octocore = 8 cores
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post #6 of 18
FX 8150 has 8 x ALU and 4 x FPU.
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post #7 of 18
No hexa-core cpu has 8 cores

Amd thubans do have six actual cores and are hexa core, intel gulftown cpu's are hexa cores.

The 8 "core" bulldozers would be octo cores and while they are nore like real cores then hyperthreading, the performance just doesn't seem to be there right now
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post #8 of 18
Quote:
Originally Posted by thebluephoenix View Post
FX 8150 has 8 x ALU and 4 x FPU.
ehhhh


8x alu and 8x fpu 128b with fpu being capable of being fused to 4x256b
post #9 of 18
It is 8 real cores.
Bulldozer can process 8 cores simultaneously. Nuff said.

It is nothing like Intel's Hyperthreading. HT allows 4 threads to be processed and 4 more threads to be scheduled simultaneously. But HT can NOT process 8 threads simultaneously.
Edited by wedge - 10/16/11 at 10:50am
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post #10 of 18
Thread Starter 
Thanks everyone for the quick responses. I changed 'hexa' to 'octo' in the OP, so thanks to those who corrected me.

So basically, if I'm understanding this right, the FX octo-chips are a sort of cross-breed between HT and true octo-core chips? Though for sure, they aren't true 8-core processors?

Also, although the reviews don't seem to favor the AMD FX chips, are they still good processors? Maybe that they just didn't live up to the hype? Would it still be wise to go with Sandy Bridge, or even wait for Ivy Bridge?

Thanks.
Edited by airspoon - 10/16/11 at 10:55am
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