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post #71 of 84
Quote:
Originally Posted by adtakhs View Post



one fetch
one decode
one FPU
one L2
two integers
= one Instruction per cycle

Two parts right , The next part is wrong it's two cycles for Fpu the FlexFPU is dual threaded inside at the the FPU scheduler.
    
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post #72 of 84
Quote:
Originally Posted by Abundant Cores View Post

Yes, good point
This ^^^ its not an 8 core despite how AMD market it, the two cores inside each of its 4 modules are not independent, Its AMD's version of Intel's 4 core + HT

It has 4 'real' cores with 8 threads, its Integer Hyper Threading as opposed to Intel's FP Hyper Threading.

Yes i know that !

Modules has very good performance in multithread aplications but not in the single thread ...

Steamroller is a big step for CMT because each core will have the own decode !



Now bulldozer and vishera have performance drops ! Cores are left without data because decode issue !


Edited by adtakhs - 2/20/13 at 9:26am
post #73 of 84
I thought competition was a good thing, AMD is doing good for once but it appears most people are mad about that. I'm all for good competition as it drives down prices and drives up innovation.
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post #74 of 84
Quote:
Originally Posted by Abundant Cores View Post

Yes, good point
This ^^^ its not an 8 core despite how AMD market it, the two cores inside each of its 4 modules are not independent, Its AMD's version of Intel's 4 core + HT

It has 4 actual core with 8 threads, its Integer Hyper Threading as opposed to Intel's FP Hyper Threading.

It's not quite that simple. To all extents and purposes, the CPU is an eight core with a shared decoder/FPU for each two core conglomerate. The shared FPU, actually contains a fully fledged 256bit FMAC that in reality is not a monoblock, but rather two 128bit FMACs feeding the same FPU and FPU scheduler. Said 'block' of items can process either 1 thread of 256bit precision FP operations (via AVX), or two threads of 128bit (via non-AVX instructions) at almost, if not completely, twice the speed that of a single unit.

So, if you consider how the multipliers and adders are arranged, each module is a true two core arrangement unless AVX is used (which it rarely is nowadays). And if AVX was used, FP performance would skyrocket, as we have seen in most computational software, due to other reasons.

Bulldozer's source of each module performing like '1.7x cores' is the shared front-end (aka task dispatcher/resource monitor). On the paper, it should be able to handle regular loads and be blazing fast with burst loads, as it is much more powerful than a reguar front-end (like the one found in K10.5 p.ex). But the issue is when BOTH the cores have to be fed simultaneously.
It is a single unit, thus it fails to properly feed the cores in time, resulting in a performance loss.


Steamroller is said to come with eight individual decoders instead of four beefy ones, thus effectively removing that 'core feeding' bottleneck both Bulldozer, and to lesser extent Piledriver have.
   
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post #75 of 84
i dont get why people write such things on these forums, mad intel fan boys, they get happy when intel beats amd and theyre all like yep its true blah blah blha then when they see amd outperform intel .. no its not true blah blah blah ... seriously get over yourselves its just a few extra FPS its not going to make a jaw dropping difference, the numbers speak as jsut to show you why its doing better .... and youre just sitting htere denying it .. lol
post #76 of 84
Quote:
Originally Posted by Demonkev666 View Post

Two parts right , The next part is wrong it's two cycles for Fpu the FlexFPU is dual threaded inside at the the FPU scheduler.
Quote:
Originally Posted by Demonkev666 View Post

Two parts right , The next part is wrong it's two cycles for Fpu the FlexFPU is dual threaded inside at the the FPU scheduler.


Yes but in this archtecture (bulldozer/vishera) cores are left without data because decode issue !



FLEX FPU is very good idea !!
Edited by adtakhs - 2/20/13 at 9:37am
post #77 of 84
Quote:
Originally Posted by aLb.Strykr View Post

i dont get why people write such things on these forums, mad intel fan boys, they get happy when intel beats amd and theyre all like yep its true blah blah blha then when they see amd outperform intel .. no its not true blah blah blah ... seriously get over yourselves its just a few extra FPS its not going to make a jaw dropping difference, the numbers speak as jsut to show you why its doing better .... and youre just sitting htere denying it .. lol

you are getting way to excited haha
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post #78 of 84
Quote:
Originally Posted by adtakhs View Post


Yes but in this archtecture (bulldozer/vishera) cores are left without data because decode issue !


I know

It only happens with two cores in a module on specific coding.

it was worse of the Zambezi then pile-driver it's Zambezi showed a 32% loss pile-driver only shows an 18% loss that's a large gain for not adding in second decoder

back on topic . This games seem to like Cache ?
Edited by Demonkev666 - 2/20/13 at 9:43am
    
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post #79 of 84
Do you guys that are crying about hyper-threading not working well know what HT really is?
If not read up on it before making silly posts about it.

It has been around since the Pentium 4 days. It is real simple. Disable HT and run some
benchmarks. Then Enable HT and run the same benchmarks again. Compare those number.
End result you will see about 10% improvement in real world applications and games.
That is why intel gamers recommend the i5-2500K over the i7-2600K. The main benefit
the i7-2600K has is larger cache but for a $70-$100 premium it wasn't worth it for games.
Money better spend on better video cards than i7-2600K over i5-2500K. Same holds true
with i5-3570K vs i7-3770K. If you do professional stuff (non-game and not search thread to
start flame wars) then the i73770K has benefits. But LGA 2011 is worlds better than 1155 and
not EOL (End-of-life) product.

Quote:
On average the 3770K with Hyper-Threading disabled offers only 90 percent of the performance of the same chip with this feature enabled [SA]
Warning: Spoiler! (Click to show)

i7-2600K vs i7-3770K @ OBR (known AMD hater)
Warning: Spoiler! (Click to show)
4 Modules /= 4 Cores
  • 486DX was the first mainstream CPU to have an integrated FPU (math co-processor) so anything before that wasn't a whole CPU ?
  • Yes Modules share resources. But that doesn't make them "Virtual Cores" or "AMDs version of HT"
  • If you could get two more cores on i7-3770K for $15-$20 per core would you?

Stock clocks is fine. You can bench in 100M Hz increments and find out how well apps/games scale on you system.
And get a good idea about the architecture you are running. Or you can go to awesome paid hardware review sites
that only run the same four games. The got easy to follow pictures. No reading required. Why won't compare overclocked
CPUs at common overclock levels nor Clock-per-Clock but they got pictures.

I have been buying intel and AMD processors for the last twenty years. I'm old. I started building my own gaming comps when I was 13.
I don't really care on sticking with one company if I get my money worth from their product. But less 10% improvement per
generation doesn't make me need to upgrade because I overclock. I would be pissed if GPUs would only increase 10% per
generation. And most of us enthusiast are GPU limited not CPU.

So, don't be so butt hurt except if AMD really did touch you in a bad place than I am truly am sorry and you should continue posting
about i3 being better than AMD 6 core while you run a $3k i7.

P.S. if you have any evidence that HT makes a big difference in games please post it.
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post #80 of 84
Quote:
Originally Posted by Heuchler View Post


P.S. if you have any evidence that HT makes a big difference in games please post it.

The theory is that if you don't have full core utilization and you have more than four threads...HT should help out a bit. Before this bench of Crysis 3 here I don't believe I've seen a game do much on more than four threads...BF3 would give my eight threads each a kiss every now and then, but I don't know if I'd call it using all eight threads. So Crysis 3 might be the first game that could benefit from from HT, but for some reason it isn't using the threads.
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