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[Chiphell]Bulldozer Sample Benchmark Leaks - Page 22  

post #211 of 285
I won't believe anything until I have the chip 'in system' and I highly doubt the performance will be lacking!
post #212 of 285
Really sick of all these rumors
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post #213 of 285
I don't know if this has been posted here, but this article explains why the B0 stepping performs so badly

http://crazyworldofchips.blogspot.co...weirdness.html

Quote:
Just like in Llano's case,actual clocks are being kept really low in order to keep the CPU within the TDP spec(via Turbo 2.0 interface) that AMD designated in the ES sampling process.This may be 35,45,65,95 or 125W. From the looks of things,current BD ES are limited at 45 or 65W and they keep throttling down whenever the limit is crossed(measured and estimated digitally in BD).
So I believe that all of these so called benchmarks of BD really aren't showing the true BD that we are going to see in stores.

Also this thread on AMDZone goes into to pretty indepth analysis of the arch. and answered alot of questions for me
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post #214 of 285
Quote:
Originally Posted by Clairvoyant129 View Post
Only in very highly multi-threaded scenarios, if not then Thuban is slower than Intel's Core 2 Quads.
Maybe this program is AMD biased but the scores they show have the phenom 940 being competitive with the core 2 quads.



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post #215 of 285
Tosh

Excellent information source. I gather the following from the about core performance. If accurate impressive

Average IPC integer will be higher. If you consider that the average IPC with pure integer code is something about 0.8-1, only logical conclusion is that the K10 ALU/AGU-s are pretty much underutilised. Main idea with Bulldozer is to make it for better utilisation of resources.
If you have 2 ALU's with utilisation of 60% that's give you IPC of 1.2 on average.
If you have 3 ALU's with utilisation of 35% that's give you IPC of 1.05 on average.
Which is better, and more power efficient ?

AMD's approach is to make smaller integer core and better utilised. Intel's approach is to make larger integer core and increase utilisation with hyperthreading.
However, hyperthreading brings ~25% more utilisation of 3-way integer core. If your integer core has 45% utilisation with single thread, that is 1.35, per single thread, wich is arround ~20% faster than K10 for integer ops. With hyperthreaded core, utilisation can go up to 1.65 IPC, which is 52-55% of utilisation of 3 ALU's in the Sandy B. core.
With Bulldozer and two threads you can go up 60% of utilisation of 2 ALU core's, which is 2.4 IPC with two threds per module vs 1.5-1.6 IPC with two threads per Intel FAT core. That is ~50% faster than FAT core per clock.
Goal is to reach 50% more performance with 33% more ALU's (4 ALU's vs 3 ALU's) and probably with same power envelope.
With single thread integer IPC will be slightly lower than SB, but not all workloads are integer. There is alot of mixed code, and there is dedicated load/store and data caches with BD module vs SB core.
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post #216 of 285
Quote:
Originally Posted by cssorkinman View Post
Maybe this program is AMD biased but the scores they show have the phenom 940 being competitive with the core 2 quads.
Clock for clock, Denebs (PII X4) are slower than Yorkfields (C2Q 45nm) and a bit faster than Kentsfields (C2Q 65nm).
 
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post #217 of 285
Quote:
Originally Posted by Redwoodz View Post
These were posted earlier in another thread here.Pretty much determined the verdict is still out on BD performance.
Aye. Personally, I think it's crap and false. The latest CPUz version supports and can identify the Bulldozer line, according to a previous thread, as this screenshot only shows one core and one thread.

Not to mention there are separate screenies for each individual thing instead of having the WEI, CPUz, and CineBench open at once.
     
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post #218 of 285
Quote:
Originally Posted by Imglidinhere View Post
Aye. Personally, I think it's crap and false. The latest CPUz version supports and can identify the Bulldozer line, according to a previous thread, as this screenshot only shows one core and one thread.

Not to mention there are separate screenies for each individual thing instead of having the WEI, CPUz, and CineBench open at once.
Nah, I think it is true. It is just that the chip is a bugged/crippled B0 ES. AMD made there first ES chips late last year meaning that they have had plenty of time to correct these issues.

The retail chip in all likely hood will be just fine.
post #219 of 285
Quote:
Originally Posted by JCPUser View Post
Nah, I think it is true. It is just that the chip is a bugged/crippled B0 ES. AMD made there first ES chips late last year meaning that they have had plenty of time to correct these issues.

The retail chip in all likely hood will be just fine.
The thing is, NO ONE knows when these B0 chips were made. Unless you have a source that states these B0 chips are from late last year?

Up until recently, we were all under the impression that BD was still on track for a June release. That is until the rumors started popping up of MOBO manufacturers not happy with the results of ES chips, which we are now seeing.

Why wouldn't AMD have sent their MOBO partners their latest ES chips?

Bulldozer threads are always filled with speculation due to the lack of real info from AMD.
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post #220 of 285
Quote:
Originally Posted by PanicProne View Post
Again, it may very well be an ES, but are people realistically expecting MAJOR performance increases in the final product?

An ES is basically a sample for a finished product. Sure, final products may have some improvements, but they are never a complete overhaul (which, at this point, seems that is what BD really needs.)


But of course, BD won't be as slow as these scores show.

It just can't be.
Jesus Man, how much is Intel giving you? for every well tough comment made on this thread you are after it making negative comments about AMD.

It is too abvious!
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