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Do the new AMD octo-core truly have 8 cores? - Page 2

post #11 of 18
Quote:
Originally Posted by edalbkrad View Post
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've read that all of the BD chips so far, are the exact same die. Whether it's 8, 6, or 4 cores. I've also read that AMD has specifically said that these will not unlock like the previous chips would.

However, I believe I recall them saying the same thing about the 6950.
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post #12 of 18
If we use engines as an analog then we could say that a traditional quadcore bee it intel or amd has 4 single cylinder engines totaling in 4 cylinders (cores). On the other hand the Buldozer has 4 two cylinder engines (2 cylinder's in one engine share parts so they can work) totaling in 8 cylindre's(cores).

Unfortunately one bulldozer module (the two cylinder engine) has trouble performing as well as a sandy bridge core (the single cylinder engine) leaving AMD's FX-8150 with less then stellar performance.
    
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post #13 of 18
Quote:
Originally Posted by Bit_reaper View Post
If we use engines as an analog then we could say that a traditional quadcore bee it intel or amd has 4 single cylinder engines totaling in 4 cylinders (cores). On the other hand the Buldozer has 4 two cylinder engines (2 cylinder's in one engine share parts so they can work) totaling in 8 cylindre's(cores).

Unfortunately one bulldozer module (the two cylinder engine) has trouble performing as well as a sandy bridge core (the single cylinder engine) leaving AMD's FX-8150 with less then stellar performance.
Half of the modules are normal interger cores,the other half are FP cores.
Each Intel core has a fuel injector(cache) to feed each cylinder,one AMD BD module or two cores only has 1 fuel injector to feed both cylinders (cores).
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post #14 of 18
Yes it's a 8-core no gimmick there, it just performs bad.

8 ALU = 8 cores, FPU are just co-processors.

The typical x 86 core nowdays has 1 ALU +1 FPU each core.

1 Intel core -> 1 ALU + 1 256bit FPU
1 Phenom Core -> 1 ALU + 1 128bit FPU
1 Bulldozer Module -> 2 ALU + 2 128bit FPU or 2 ALU + 256bit FPU
post #15 of 18
Welcome to OCN,
No it is one core split in to 2 and then with new and extra instruction sets multiplied to an exact of its self and then doubled,

Its apparently a 4 core with an 8 core instruction set (HT) that makes you think you have purchased an octo (8) core when really you have purchased a dual core,

Its what Intel did and Amd tried to copy what Intel did (Architecturally) but Intel own the copyright so it was doomed to fail for Amd's Bulldozer,
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post #16 of 18
Quote:
Originally Posted by airspoon View Post
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.
What do you do with your computer ? That should ultimately be what makes you decide over one product over the other. That and your budget.
post #17 of 18
Quote:
Originally Posted by Heavy MG View Post
Half of the modules are normal interger cores,the other half are FP cores.
Each Intel core has a fuel injector(cache) to feed each cylinder,one AMD BD module or two cores only has 1 fuel injector to feed both cylinders (cores).
Which can be made to work, as long as you time them properly. Like a firing order so to speak.
post #18 of 18
It's eight real cores inside that thing. The only kicker is that the ALUs and FPUs can act as 8+8 or 8+4. For integer workloads, it's always 8 units. For floating point workloads, it can act as 8 (128 bit) or 4 (256 bit) units. People wouldn't still be arguing about if the chip has 8 cores or not if performance were better. =/ Calling it a 4 core just because that explains how BD is performing isn't a good reason.
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