How fast do you guys think Cayman will end-up (please vote)

[AlphaWolf]

Does someone actually measure the placement of that box for the slide, or do they just eyeball it?

 

[I.S.T.]

You are seriously not trying to use that as a way of gauging the performance differences between the two.

Edit: I mean, look at the comparison between the HD 5870 and the HD 6870. The HD 5870 is almost 50% higher than the HD 6870. Yet, we know the performance differences between the two is much closer than that.

 

[liolio]

I expect the 69xx series (6990 aside) to be somewhere the 58xx and gt480 (closer to the GT480 tho).

 

[Shtal]

You are seriously not trying to use that as a way of gauging the performance differences between the two.

Edit: I mean, look at the comparison between the HD 5870 and the HD 6870. The HD 5870 is almost 50% higher than the HD 6870. Yet, we know the performance differences between the two is much closer than that.

Are you thinking 5% percent ??

 

[psolord]

You are seriously not trying to use that as a way of gauging the performance differences between the two.

Edit: I mean, look at the comparison between the HD 5870 and the HD 6870. The HD 5870 is almost 50% higher than the HD 6870. Yet, we know the performance differences between the two is much closer than that.

That would be the case if you perceived each bubble as 100%. My guess is that each bubble shows a relative performance of 20%. Personally I explained my thoughts a couple of posts back.

Nothing is curved in stone though. For example the 57XX position, does not fit with my 20% performance scenario. We are just discussing a slide mate, which admittedly is quite interesting since it comes from AMD. Nothing more.

 

[psolord]

What is your speculation "count" stream processors for Cayman GPU ??

http://www.techpowerup.com/img/10-10-14/71f.jpg

No I will not go down that road. I am not one of those B3D Gurus unfortunately. My previous speculation was based on that RPE slide and was completely off, lol.

I can only speculate on this slide now, with percentage differences alone. Something around >30% of the cards they replace, would be my best guess right now.

The Barts die size is quite interesting though. Maybe AMD could make a chip that would be 50% faster and 50% larger if the new architecture scales almost linearly.

TDP wise, things may not be so bad. People are expecting high TDPs from the Cayman cards, because the Barts chips did not bring such great TDP gains. This happened for a reason though. They clocked the chips quite high, in order to be as close as the 58XX performance levels as possible. This may not be the case for Cayman.

 

[I.S.T.]

Are you thinking 5% percent ??

*sigh*

No, I'm guessing the HD 5970 will be 20% or more faster. It's a dual-GPU card. Unless AMD pulls some magical faerie pixie dust out of its pocket, there's no way the HD 6970 will get closer than that. They're limited by 40nm.

This is possibly complicated by Dave's admission that optimizations for Evergreen carries over for Barts. If the trend keeps up, Cayman will be nothing but a larger Barts, and there won't be much performance to wring out of Cayman.

Of course, I will be very pleased if the magical faerie pixie dust does exist. I just doubt it does.

I'm also hoping Cayman isn't just a larger Barts, and that it'll be able to get massive performance increases via drivers ala every new architecture/fairly altered refresh.

Edit: Forgot two words. >_<

 

[Squilliam]

How about assumptions on assumptions?

Like I'll assume Cayman shares the same 20% improvement that Barts had on a performance/area basis and I'll also assume that Cayman is 20% larger than Cypress. Therefore Cayman is obviously 40% faster!

Well, its about as accurate as eyeballing a marketing slide for the relative heights of various chips!

 

[RedVi]

I don't think you can use Barts as any indication as to how Cayman will perform.

Even if they are the same arch, surely Cayman will be DP capable, so the performance/mm^2 isn't going to be the same.

 

[Shtal]

Cayman is not simply an improved Radeon HD 5000 architecture. It looks like AMD has invested some time and effort to tweak up the architecture and gain some more performance. They got us all here, as they were always saying that 6800 is an upgrade to 5800 architecutre, not telling us that there is Cayman series with much more power, just around the corner. http://www.fudzilla.com/graphics/item/20651-cayman-is-sampled

Interesting that fudzilla thinks Cayman will NOT be similar to Barts design.

 

[Albuquerque]

Interesting that fudzilla thinks Cayman will NOT be similar to Barts design.

I don't think so; I think it's fairly commonly known that we were getting a 4D architecture in this round of parts, and since Barts isn't that arch, by default that leaves Cayman (and Antilles since it's dual-Cayman.)

 

[Shtal]

I don't think so; I think it's fairly commonly known that we were getting a 4D architecture in this round of parts, and since Barts isn't that arch, by default that leaves Cayman (and Antilles since it's dual-Cayman.)

I don't know what you mean "I don't think so"

Barts was sort of (hybrid) improved/tweak of Cypress.
Cayman should be something different I hope; like 4D instead 5D.

 

[AlphaWolf]

I don't know what you mean "I don't think so"

I believe he means it's not that interesting in that the belief was already commonly held.

 

[Shtal]

I believe he means it's not that interesting in that the belief was already commonly held.

Thanks!

 

[DarthShader]

I don't think so; I think it's fairly commonly known that we were getting a 4D architecture in this round of parts, and since Barts isn't that arch, by default that leaves Cayman (and Antilles since it's dual-Cayman.)

We know that two ASICs are going to have the 4D arch, not more. Could be Turks and Caicos. But since they are rumoured to be 28nm pipecleaners, it's rather unlikely AMD will want to experiment with both new process and new arch.

 

[UniversalTruth]

As I remember correctly and my memory serves well,... I do remember somebody claiming that the architecture for R7*** will be further improved to 3D.

 

[Wirmish]

Watts: 5870 = 188W. Cayman > 225W < 300W ~= 250W. 32% more.
SIMD: 5870 = 320 SIMD. Cayman (1536 ALUs) = 384 SIMD. 20% more.
GDDR5: 5870 = 4.8 GHz. Cayman ~= 5.75 GHz. 20% more.

Cayman should be at least 20% more powerful than Cypress at the same frequency.
I expect the 6970 to be somewhere between the GTX 480 and the GTX 580.

And if Cayman have 480 SIMD 4D (1920 ALUs), it will easily beat the GTX 580.

 

[Shtal]

And if Cayman have 480 SIMD 4D (1920 ALUs), it will easily beat the GTX 580.

Assuming 100MHz higher clocked than GTX580

Because clock for clock would be very close between Cayman and GTX580......

 

[Shtal]

The correct answer was for CaymanXT (Just as fast as GF480GTX Fermi)

 

[no-X]

Mmm, both sites, which provide performance summaries (computerbase.de and hardware.fr) dropped GTX480 from Cayman's review. Quite an interesting coincidence...