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post #81 of 84
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Quote:
Originally Posted by Artikbot View Post

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.

Thanks, good info smile.gif
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post #82 of 84
lots of sillyness in this thread.


1) HT doesn't help gaming. It never has. If anything it tends to hurt gaming performance (or at least there are more games out there who see a frame rate drop from HT then a gain).
2) HT does not simulate a core. At best with aps that use HT, you'll see a 20%-30% gain in performance. So for a 4 core system, that will be like sorta adding a 5th core. of course games don't benefit from this... or at least most don't so this is a moot point. There is a reason HT enabled i7-3770 or the extreme edition i7s don't really game any better in any bench then an i5. At least not in any way that their clock speeds wouldn't explain.
3) clock speeds don't really matter when comparing different architectures. if you're looking at 2 SB intel chips, the clock speed will really only tell you how the single thread performance is going to be. Once you look at a piledriver chip, and then an IB chip the clock speeds mean little in cross chip comparison. A 5ghz oc'ed i5 will beat on a 5ghz Oc'ed piledriver in single threaded apps. Just like a 4.6ghz oc'ed piledriver will match a stock i5-3570k in single threaded tasks. So yeah... there is a difference that points to an intel advantage.
4) HOWEVER, those differences vanish in games that use more then 1 thread... and the more threads those games can use the more advantage the AMD chip will be at... as AMD has chosen to go for many cores (4, 6, 8) in their chip designs, vs intel focusing on single core performance and small cored chips (2,4). The result is as more games make use of multi-cores and scale properly into many cores, AMD chips will bench better then the intel chips.

This isn't about some "bias" with the benchmarks. Or special "coding" with the games. This is just the nature of the respective focus of the two companies. AMD went multicore when they couldn't compete with intel's single core performance. They bet that future software would make use of the multicores and they'd be able to close the gap. This was a losing bet up until this last 6 months. They suffered big time for this gamble... when another company might have focused on their Deneb cores structure which almost competed with intel in single core performance, they broke into their piledriver/steamroller architecture, making a radical step out onto their multicore gamble.

it seems like it might start to pay some big dividends... which is only a good thing. The more AMD can compete with Intel the more innovation and lower prices we'll see going forward. These last 5 years with almost no competition coming from AMD seem like they might be over, and this almost 4 year stagnation in the computer industry might start to break free.

This is good news for everyone... no matter if they're a fan of team blue or red. I for one am warmed when i see gaming benches that show an AMD chip at stock beating an intel chip at stock. Its been a long time since i've seen that.
 
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post #83 of 84
Quote:
Originally Posted by CloudX View Post

I see the chart and the 4-5 extra FPS over the 2600k, then I see the clock speeds...
So what? Back in the days of the Pentium 4, Intel never came close to achieving IPC parity with the Athlon XP, and when the A64 came out, it was ugly. If you measure CPU's at stock clocks, it's still a fair comparison. The FX-8350 is in the same price range as the 3570K and performs comparably, and that is all that matters.
Quote:
Originally Posted by Arizonian View Post

A little too late?
Didn't AMD announce they are no longer competing with Intel in the discreet CPU market?
Any other discreet AMD CPU's in the works beyond FX8350?
Is the CPU competition back on?
It never was off. That "announcement" was totally taken out of context. If you read the entire interview, it was quite clear that the AMD CEO was talking about the company's long-range plans for the mobile market. So if you're looking for a mobile FX-8350, stop looking.
Quote:
Originally Posted by Rookie1337 View Post

Honestly...I still think AMD should have told Intel to suck it and never given them x64. Of course at the time (and even now) we're still hopelessly 32bit dependent. frown.gif
There are so many cross-licensing agreements between the two companies that I don't think AMD could have done that. If they had, Intel probably would have cut off AMD's right to implement MMX and SSE1/2/3 in their x86 processors. What AMD was trying to do was assume market leadership and force Intel to follow their lead, at a time when Intel was still hoping to replace x86 with the Itanium architecture, which AMD doesn't have a license for. When the Athlon 64 annihilated everything Intel had, Intel had no choice but to adopt x86-64 themselves.

You can blame Microsoft for 32-bit continuing to linger on. They should have stopped support for IA-32 with Windows 7. We won't go fully 64-bit until Microsoft quits supporting 32-bit except via WoW64.
     
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post #84 of 84
Folks, try to keep it clean - NO name calling, trolling or rude/disrespectful behaviour please.

edit the original source is down
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