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[xbitlabs] AMD: We Are On Track With Steamroller Micro-Architecture in 2013. - Page 41  

post #401 of 718
Quote:
Originally Posted by PiOfPie View Post

I forget, was there any word on Steamroller having a retooled IMC? Ordinarily those are considered Keller's specialty if I remember correctly, and considering how bandwidth-hungry the APUs are, either Kaveri or the XV APU with a Keller-designed DDR4 IMC would be drool.gif

Not quite as much of an issue on the desktop systems, but it'd still be nice if one of the weaker points of the FX design ATM could get revised.

I don't know if it'll make it into Steamroller. AMD, like I said before, seems to fix one thing at a time with Bulldozer. PD fixed FPU (which made it game a lot better) and kind of left integer alone. Steamroller looks like front end fixing. Excavator, I have no idea. I know improving the IMC is extremely important for AMD and it's an easy way to gain a ton of iGPU performance without having to spend a bunch of tech resources on something like designing a new GPU. They really just need to make the IMC better and they'll see iGPU performance skyrocket.

Quote:
Originally Posted by perfectblade View Post

can't amd come up with a name that doesn't somehow seem to reference pro-wrestling or construction? granted intels seem to be typically pretty abstract and/or meaningless, but they're still preferable

I wish they would. All of these names are all named after slow moving heavy equipment. They should have at least named them after something fast or something that doesn't have a speed (like a lake or town or stars, etc.) When I think of a real life steamroller, the first thing that comes to my mind is something that's big, hot, consumes a lot of fuel, and moves extremely slow.

Quote:
Originally Posted by Biorganic View Post

So lets take what they said and cut it in half. 15% increase would be pretty nice

It's marketing. They take their best result and put it in a slide. I imagine that 30% is probably a simulation that favors the changes they made the most, and in some situations it probably won't make anything better at all. Look at the change from PD to BD, some things showed a lot of improvement and some a same clocked BD core scored within margin of error. AMD just simply doesn't improve the whole thing, they just do chunks of it. That's completely understandable because they're a hell of a lot smaller than Nvidia and Intel.

There is dumb code with no branching that won't care at all about branch prediction penalties, and there is code that is nothing but branches that have a 1:2 chance of taking a certain path. Each set of code is going to affect the numbers in that slide different.

The real question is, how much code ends up starving bdverx decoders and how bad bdverx branch prediction is. (I'm calling it bdverx because internally Bulldozer is bdver1 and Piledriver is bdver2, so I just simplify since they share the same problems).

However if they shorten up the pipeline, I wonder how it will affect clocks. It will probably affect highest clock and we may end up with a situation where bdver3 clocks 10% lower but has 30% IPC increase, so the slide is right (most of the time) but it doesn't translate to 30% increase in performance. I'm just taking guesses though, we are all kind of assuming that Steamroller will clock the same or better than Piledriver, and that may simply not be the case.

However trading clock for IPC has worked in the past, all the way back to Cyrix, so it might end up good. However it is AMD and no doubt that if something like that happened, that there would be people saying AMD SUX! for not being able to clock as high anymore.

I guess you can call it siddlevick's law: "when AMD does something that Intel or Nvidia do, AMD is far more likely to receive negative feedback from it compared to when Intel or Nvidia did/do it." I wish it wasn't law, but it happens everywhere, even in 10 year old threads on other forums.

EDIT: kernel preemption letting me down on this laptop and missing some keys making some goofy words.
Edited by sdlvx - 4/4/13 at 2:26pm
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post #402 of 718
What is full system integration in HSA roadmap?
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post #403 of 718
Quote:
Originally Posted by Biorganic View Post

So lets take what they said and cut it in half. 15% increase would be pretty nice

I say 20. They're improving, if not totally fixing basically everything that is wrong with Bulldozer!
   
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post #404 of 718
i hope so
post #405 of 718
Quote:
Originally Posted by Artikbot View Post

I say 20. They're improving, if not totally fixing basically everything that is wrong with Bulldozer!

You say 20. AMD says 30. History says 5-10.

I'll go ahead and go with 5-10, 15 tops.
post #406 of 718
Quote:
Originally Posted by Stay Puft View Post

An X8 Thuban would had scored 7.41 in cine bench and would have given 3770K owner fits in multithreaded apps. At 4ghz it would have scored 9.34

It's die would also have been bigger and it would have been a complete dead end with regards to clock scaling. A Phenom II X8 would look good against Bulldozer, and maybe VIshera, but I'm doubtful if any reasonable evolution of Phenom could compete with Piledriver.

Bulldozer was a step in the right direction, even if it's gotten off to a shaky start.
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post #407 of 718
Quote:
Originally Posted by Biorganic View Post

Really? Because if single threaded performance/IPC is greatly improved from Bulldozer/PD then it will should perform much better on the whole. Not sure if serious.[/quote


Single threaded performance is NOT synonymous with IPC as you imply in your reply to my challenge. Get it right.
post #408 of 718
Quote:
Originally Posted by os2wiz View Post

Quote:
Originally Posted by Biorganic View Post

Really? Because if single threaded performance/IPC is greatly improved from Bulldozer/PD then it will should perform much better on the whole. Not sure if serious.[/quote


Single threaded performance is NOT synonymous with IPC as you imply in your reply to my challenge. Get it right.

learn to insert your text OUTSIDE the quote box.. rolleyes.gif
tongue.gif
(see what I did there..wink.gif)
Edited by malmental - 4/4/13 at 3:56pm
post #409 of 718
Quote:
Originally Posted by Biorganic View Post

Really? Because if single threaded performance/IPC is greatly improved from Bulldozer/PD then it will should perform much better on the whole. Not sure if serious.

I am serious. Single threaded performance is the least important criteria of cpu performance . Are you so ocd that you fail to understand that the vast majority of software runs better when multithreaded??? Even word processors can have multiple threads. I used to run os/2 operating system. I had a premium word processor called Describe. it was multithreaded for spellcheck, formatting, searches etc. it was a word processor designed for large documents and was heavy duty and lightning fast. MS Word is piss compared to Describe.
post #410 of 718
For sure, single threaded is not that important. It's only important if you're running poorly coded applications that doesn't support more than 2 cores.
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