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Bulldozer Questions from an Intel User. - Page 3

post #21 of 162
Quote:
Originally Posted by Anthraxinsoup View Post
You don't know that at all.
Dual CPU isn't going to happen on AM3+.
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post #22 of 162
Quote:
Originally Posted by BallaTheFeared View Post
How are they real cores if they operate at diminished capacity?

I have 4 real cores.

A 4 "core" bulldozer will not have 4 real cores in the same sense as I have 4 real cores.

Its still a SMT design, they aren't true cores in the sense that we've defined cores since the first microprocessor.
So if AMD or Intel release a cpu with cores that have less cache or less interger pipelines than YOUR cpu, that means they're not real cores?

By that logic, if Intel release a cpu with 20 interger pipelines per core and 50Mbs L2 cache and three schedulers per core, then YOUR 2500k will cease to have "proper" cores? Obviously that's nonsense.

At the end of the day, it doesn't matter one iota whether you and I think they're real cores or not, all that will matter is how they perform, both single and multi threaded.
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post #23 of 162
Quote:
Originally Posted by Anthraxinsoup View Post
You don't know that at all.
Yes we do. AM3+ will not feature dual-socket motherboards. Socket AM3+ is not designed for dual CPU configurations. Why do you think when AMD did release dual CPU capable motherboards it was on a different socket from what the socket at the time was? (Socket 939)

Quote:
Originally Posted by dixson01974 View Post
C32 is for consumers and the G34 is for servers.
What? C32 and G34 are for workstations/servers period. Consumers can still buy both. I don't quite understand what you are trying to say.
Edited by MrAlex - 5/24/11 at 3:48am
    
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post #24 of 162
Quote:
Originally Posted by dixson01974 View Post
The way Intel makes HTT is that is uses half of the FPU for heavy threading apps.
The FPU can do integer math?

purpleannex maybe try a less extreme example next time.

You wouldn't call HTT a real core, neither would I. I wouldn't call a two cores that share L2, L3, NB, Fetch, and Decode (is there more?) two cores either.

Yes how they perform, not what their pricing is. I'm glad we agree on that.
    
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post #25 of 162
Quote:
Originally Posted by BallaTheFeared View Post

Yes how they perform, not what their pricing is. I'm glad we agree on that.
I think we're more alike than either of us would care to admit...
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post #26 of 162
Quote:
Originally Posted by BallaTheFeared View Post
How are they real cores if they operate at diminished capacity?

I have 4 real cores.

A 4 "core" bulldozer will not have 4 real cores in the same sense as I have 4 real cores.

Its still a SMT design, they aren't true cores in the sense that we've defined cores since the first microprocessor.
BD is not SMT.
SB is SMT, because one core runs two threads simultaneosly.

See ? BD runs only one thread per core, it isn´t SMT.

BD modules share few parts (frontend,L2,L1I ..), but that doesn´t make it work like SMT.
-----
Cluster-based MultiThreading at work


In real desktop code i believe, user will not notice lower performance if run fully loaded both cores in module. (<5%)
However that statement about 80% makes more sense to me in server loads, where code is high performance sensitive, fine tuned - critical.

=============================
Quote:
Originally Posted by dixson01974 View Post
C32 is for consumers and the G34 is for servers.
no, both are servers
C32 1-2P
G34 2-4P

Quote:
Originally Posted by dixson01974 View Post
HTT is the FPU. I guess you need to read up on HTT.
Difference between HTT (smt) cpu and nonHTT cpu is - first has double amount registers (for each thread) + few other architectural details in pipeline.

Except these features is HTT cpu similar to non HTT cpu.
These additional changes in cpu makes die ~5% bigger.


Quote:
Originally Posted by dixson01974 View Post
The way Intel makes HTT is that is uses half of the FPU for heavy threading apps.
im afraid this is wrong
Edited by pietro sk - 5/24/11 at 9:02am
    
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post #27 of 162
You're right its not simulated multitasking, it has CMT (cluster multitasking), however its still on a core level.

I dislike SMT with a passion, its typically worthless and can cause a performance loss. However luckily you can turn that off. You can't turn off AMDs CMT. You are always stuck with a performance loss, unless you are running a single/dual threaded app and set the affinity in windows every time you run a program, however windows will still use the other cores if it chooses, I don't see anyway around this.

My i5-2500k has 4 levels of turbo, the most I ever saw when running it in different turbo modes was phase 2 and that wasn't very often. It never ran at stock, it almost always ran at phase 1.

I can demonstrate this if you'd like, both Intel and AMD are trying to get too fancy on a OS that simply doesn't play the same game.
    
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post #28 of 162
Balla,

1. They are real cores. Real, physical, cores that you can see unlike intels current offering.

2. I'll have to disagree with you on the performance as of now. Wait for official benchmarks then we'll talk.
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post #29 of 162
hehe

I have two glasses of water here, one is filled to the top and the other is filled up only 60%.

I still have two glasses of water, however only one is full.

Its fine if you want to call it 4 real cores, then we can compare it directly to the i7-2600k and nothing else when it comes out since the i7-2600k by your logic still only has 4 cores.
    
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post #30 of 162
To get technical, at least to me the 8-core FX-8110 CPU for example, has 4 "Bulldozer Modules" with each module containing 2 interger units. Thus, effectively it shows up as 8-core to the system. With that intergrated into the CPU bulldozer should be really good at Integer based applications. Of course real benchmarks is what will tell the real story.
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