AMD: R9xx Speculation

[fellix]

Sadly, while that slide indicates that ROPs have doubled over Juniper, Z-rate per clock hasn't.

Let's hope they've done something to improve the compression, at least.

 

[Triskaine]

One SIMD still has 80 SP's, but now with 4D ALU's, which means that wavefront size has increased to 80.

Why would they do that? 64 was already big, now Branch-Granularity will suck even more compared to GF100.

But at least the 6770 will soundly beat the 5850 with those specs, that's for sure.

 

[Jawed]

Revised slide is confusing

20 VLIW-4s per SIMD? That's very strange.

 

[Jawed]

One SIMD still has 80 SP's, but now with 4D ALU's, which means that wavefront size has increased to 80.

Why would they do that? 64 was already big, now Branch-Granularity will suck even more compared to GF100.

80 is a really really nasty number for hardware thread size. If this is true then a whole pile of code that enjoys the "squareness" of 64 or 256 sized workgroups is going to be a nightmare. A total fucking bitch, in fact. Not to mention the mismatch in banks for 32KB of LDS, which doesn't divide into 20s in any meaningful way.

I don't believe this.

 

[Triskaine]

I don't believe this.

I don't want to believe this either, but that's the only possible way to interprete that slide.

 

[John021]

80 is a really really nasty number for hardware thread size. If this is true then a whole pile of code that enjoys the "squareness" of 64 or 256 sized workgroups is going to be a nightmare. A total fucking bitch, in fact. Not to mention the mismatch in banks for 32KB of LDS, which doesn't divide into 20s in any meaningful way.

I don't believe this.

Common people do not understand this.. what does it means in terms of performance, power or something else?

Do drivers for these cards will be a nightmare to make?

 

[PatrickL]

Who said theses slides were not another fake attempt ?

 

[CarstenS]

This doesn't look like a typical AMD slide either. At least not the ones I know from the past. They have mostly been structured with a liitle bit of information per slide and - very importantly - the improvements in each area highlighted.

 

[Arnold Beckenbauer]

So this picture says, HD6770 can give you 2304 GFLOPS. How is this possible?
...


Crap, something went wrong.

 

[mao5]

Uploaded with ImageShack.us


http://we.pcinlife.com/thread-1520616-1-1.html


Looks pretty nice.

FAKE

 

[UniversalTruth]

Ok. I want the real one then.

 

[mao5]

Ok. I want the real one then.

already in some posts

 

[Triskaine]

So this picture says, HD6770 can give you 2304 GFLOPS. How is this possible?
320x4 gives you 1280 SPs. So 1280 * 2 FLOP (MADD) * 0,9 GHz is 2073,6 GFLOPS.

This says otherwise:

http://www.wolframalpha.com/input/?i=1280*2*0.9

 

[Man from Atlantis]

FAKE

give the real one then

 

[no-X]

There's no mention about transistor count and power consumption... it's also untypical, that 2/3 of the slide are consumed by specifications of previous gen. products. This slide also mentions 5 Gbps modules for all products, despite HD5xxx slides always mentioned exact numbers (e.g. 4.8 Gbps for HD5870).

 

[mboeller]

already in some posts

Where?

 

[MarkoIt]

It's probably another fake slide.. it's not enough polished to be real.
but if what mao5 is true, that the official pdf are around it won't be much before we get real leaks. It would be about time, launch is in less than 3 weeks!

 

[EduardoS]

One SIMD still has 80 SP's, but now with 4D ALU's, which means that wavefront size has increased to 80.

Another fake, but 80*4 = 64*5, I think there is enough rumors to dismiss the 4D ALUs rumor, it's 5D again, at least for this generation.

And I'm not sad about this... But drivers could improve, it's taking too long to see a decent compiler for this.

 

[caveman-jim]

launch is in less than 3 weeks!

it is?!

 

[neliz]

It's probably another fake slide.. it's not enough polished to be real.
but if what mao5 is true, that the official pdf are around it won't be much before we get real leaks. It would be about time, launch is in less than 3 weeks!

I surely hope that's wrong.