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Bulldozer Questions from an Intel User. - Page 12

post #111 of 162
Quote:
Originally Posted by Mokka View Post
OK, I have read quite a bit about the Bulldozer modules but I still don't completely understand. Can one module combine its resources and act as a single core?
2 cores, 1 module. 2 cores can combine together to make one larger FPU (256 bit, or 128 + 128).
Edited by onoz - 5/26/11 at 1:04pm
 
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post #112 of 162
Quote:
Originally Posted by onoz View Post
2 cores, 1 module. 2 cores can combine together to make one larger FPU (256 bit, or 128 + 128).
OK, for example, if you were playing a game that was optimized for 2 cores and you had little else going on in the background, would 2 of your 4 modules combine its resources to give you a performance gain? Or would one module handle the game and the other 3 go relatively unused?
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post #113 of 162
Windows will control what cpus are used, it will also spread a single thread over multiple cores.

An 8 core bulldozer cpu would shut down unused cores, and use the power saved to boost performance on the active cores. That would be your performance gain I believe.

How exactly that works with windows liking to use multiple cores for one thread is unknown to me.
    
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post #114 of 162
Quote:
Originally Posted by BallaTheFeared View Post
Only if you word it like a marketer.

1 core used.

10% loss.

Gain 90%

2 cores used.

20% loss.

Gain 180%
1 core per module used = 100% = 0% loss per core

2 cores per module used = 90% per core = 10% loss per core



Quote:
Originally Posted by JF-AMD View Post
Quote:
Originally Posted by purpleannex View Post
I'm sure I read before from JF, that when BD is using only one core in a given module it gets full use of all the resources and therefore acts as a complete uncompromised BD core. The 180% figure only applies if both cores are being utilitised. So from a gamers perspective, if only two cores are being used, they will be full cores.

Maybe JF could clarify this... maybe I dreamed it!?
That is correct, but there is not a huge overhead for the sharing, so having access to all of the resources will not be a big uptick in performance as some people think.

You are probably better off running a 4 thread game on 2 modules than on 4 individual cores because then you can power gate down the undused modules, boosting the clock speed of the other cores.
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post #115 of 162
Hmmm, interesting and disappointing. I thought there would be a sizable performance gain if a module acted as a single core.
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post #116 of 162
Quote:
Originally Posted by Mokka View Post
Hmmm, interesting and disappointing. I thought there would be a sizable performance gain if a module acted as a single core.
You don't know what the performance is without a module acting as a single core, it could still be a sizable gain over anything else out right now. You can't be disappointed about the performance of a cpu that you have no idea what the performance will be.
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post #117 of 162
Quote:
Originally Posted by purpleannex View Post
You don't know what the performance is without a module acting as a single core, it could still be a sizable gain over anything else out right now. You can't be disappointed about the performance of a cpu that you have no idea what the performance will be.
You are right.

But, you know how you think you have something figured out, and it would be great if it worked that way, then you found out you were wrong and you end up disappointed? That is where I am right now, even though i know it mean F-all.
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post #118 of 162
Quote:
Originally Posted by Mokka View Post
OK, I have read quite a bit about the Bulldozer modules but I still don't completely understand. Can one module combine its resources and act as a single core?
No.


Quote:
Originally Posted by BallaTheFeared View Post
Windows will control what cpus are used, it will also spread a single thread over multiple cores.
Not that I am aware of. Can you please explain to us how this works because I have never seen a single thread spread over multiple cores.
post #119 of 162
BallaTheFeared ,you ve been made checkmate !
Move on.
   
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post #120 of 162
Quote:
Originally Posted by JF-AMD View Post
No.




Not that I am aware of. Can you please explain to us how this works because I have never seen a single thread spread over multiple cores.
JF, when Bulldozer debuts coming up here in a couple weeks - will this include benchmarks? Or, will samples be provided to the major review sites? Or will we all have to wait until consumer production when they can actually be purchased via retail channels before we see the actual performance of Bulldozer chips?
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