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[Various] AMD's Zen To Have 10 Pipelines Per Core - Details Leaked In Patch (Updated) - Page 72

post #711 of 758
Quote:
Originally Posted by looncraz View Post

Absolutely, Zen needs to improve more with floating point than with integer. 40% greater integer will pit Zen against Skylake, 40% faster FPU will be acceptable, but not enough to reach Ivy Bridge... which averages to Haswell IPC tongue.gif

depends on which instruction sets are being compared on the FPU side, the excavator FPu isn't not a slouch, when more modern instructions are utilized.
post #712 of 758
Quote:
Originally Posted by SCollins View Post

depends on which instruction sets are being compared on the FPU side, the excavator FPu isn't not a slouch, when more modern instructions are utilized.

wait what, "isn't not a slouch" meaning it is a slouch?
not not means yes.


sadly modern instructions aren't being utilized by old apps that hardly gets updated.
even most newer apps aren't coded to use modern instructions.

and the reason is pretty simple, its a conflict of interests.
most veteran programmers aren't interested in learning how to use modern instructions.
Edited by epic1337 - 2/8/16 at 4:53pm
post #713 of 758
Quote:
Originally Posted by looncraz View Post



The great thing here, is that we have this much information... and those of us who do that math actually have a hard time figuring out how Zen will only be 40% faster than Excavator... the only explanations being that AMD went the fastest, crudest, path possible in the rest of the core in order to get a quality product to market... which would explain why they already know the next iteration will be 15% faster (itself quite a nice jump in performance).

for PR reasons that are some cool looking numbers,
first a 40% ipc then next generation offers another 15% that is some nice baseline for advertising. wink.gif
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post #714 of 758
Quote:
Originally Posted by flopper View Post

for PR reasons that are some cool looking numbers,
first a 40% ipc then next generation offers another 15% that is some nice baseline for advertising. wink.gif

They've made similar promises in the past

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post #715 of 758
Quote:
Originally Posted by 2010rig View Post

They've made similar promises in the past

Yes, and they gain about 10% each...
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post #716 of 758
Quote:
Originally Posted by 2010rig View Post

They've made similar promises in the past


So, I gotta ask because I don't know, is that demonstrably untrue?
post #717 of 758
Quote:
Originally Posted by Fyrwulf View Post

So, I gotta ask because I don't know, is that demonstrably untrue?

Here, see for yourself
http://www.anandtech.com/bench/product/434?vs=697

Clock for clock, the 8350 is not 10% faster than the 8150 in Single Thread performance. In cinebench for example, it's 9% faster with a 400 MHz advantage.

I guess if you go stock vs stock they came close, but that's misleading when one is clocked 400 MHz faster.

My post was merely pointing out that AMD has made similar promised gains in the past. We didn't get anything else that replaced the 8350, so who knows.
Edited by 2010rig - 2/12/16 at 11:48pm
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post #718 of 758
Quote:
Originally Posted by Fyrwulf View Post

So, I gotta ask because I don't know, is that demonstrably untrue?

No, actually they delivered on that quite closely.

Piledriver was ~10% faster than Bulldozer.
Steamroller was ~10% faster than Piledriver, but the lack of L3 resulted in only a 6.7% average boost
Excavator is ~10% on average faster as well.

So, pretty much, they delivered as they claimed all those years ago. Albeit, just barely. They ran into a lot of difficulty scaling the IPC, which makes sense with only two ALUs...

Also, I'm talking IPC only, if you include full performance, meaning also including multi-threading, they easily met those targets. Multi-core efficiency was vastly improved.
post #719 of 758
indeed, so far their recent slides aren't as exaggerated as their old ones back before they launched steamroller, Ops(operations) per cycle is another term for instructions per cycle.



but hey, if we use this as reference to AMD's habits, then Zen's promised 40% IPC increase might as well fall short of 20%.
i would rather appreciate it if they'd be more modest and reserved with their estimates.
Edited by epic1337 - 2/13/16 at 12:05am
post #720 of 758
Quote:
Originally Posted by epic1337 View Post

indeed, so far their recent slides aren't as exaggerated as their old ones back before they launched steamroller, Ops(operations) per cycle is another term for instructions per cycle.



but hey, if we use this as reference to AMD's habits, then Zen's promised 40% IPC increase might as well fall short of 20%.
i would rather appreciate it if they'd be more modest and reserved with their estimates.

All in all, this wasn't a terribly far-off estimate, either.

SR was 20% over Piledriver and 30% over Bulldozer, just the IPC gains were all eroded by the clock hit.

Plus this slide dates to November 2012, which IIRC was when Steamroller A was still on the table.
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