Official speculate before its too late: RSX Spec thread

[ihamoitc2005]

Resolution for 3xSSAA @ 30fps

At what resolution??

1600x1200

http://www.anandtech.com/video/showdoc.aspx?i=2607&p=4

 

[ihamoitc2005]

misstype

1600x1200

http://www.anandtech.com/video/showdoc.aspx?i=2607&p=4

for subject of previous post I mean 4xSSAA not 3xSSAA. Sorry for this mistype.

 

[Titanio]

And what framebuffer type? I wouldn't imagine B&W needs to concern itself with 16bit FP HDR.

Doesn't seem to specify how they're doing HDR, but I couldn't rule it out given that anand's explanation suggests that MSAA was a technical impossibility given stuff Lionhead was doing. Though there may be other techniques used that would also render MSAA an impossibility..

That's a fairly interesting tidbit, though. For some PS3 games, SSAA may not be the write-off it's often suggested to be. Sure, RSX has less bandwidth available to it than a 512MB GTX, but then in the above example with B&W2, they're nearly using the same resolution as 1080p. So for 720p..

 

[ihamoitc2005]

Transparency

Doesn't seem to specify how they're doing HDR, but I couldn't rule it out given that anand's explanation suggests that MSAA was a technical impossibility given stuff Lionhead was doing. Though there may be other techniques used that would also render MSAA an impossibility..

That's a fairly interesting tidbit, though. For some PS3 games, SSAA may not be the write-off it's suggested to be. Sure, RSX has less bandwidth available to it than a 512MB GTX, but then in the above example with B&W2, they're nearly using the same resolution as 1080p. So for 720p..

Maybe (this is a guess) very high transparency use (fur, grass, particles, many far away objects) so MSAA not so effective for FSAA.

 

[aaronspink]

Which means that if RSX is indeed based on G71 it might feature 28 working pipelines @ 550MHZ.

Unlikely due to both power and die size constraints. Just a straight shrink of the G70 is on the order of 220-240 mm^2. G71 will likely be on the order of 310-340 mm^2 in 90 nm and burn on the order of 100-110 watts of power.

Likely the RSX will be a 24 pipe G70 targetted to around 60-70 watts of power.

Aaron Spink
speaking for myself inc.

 

[Titanio]

Maybe (this is a guess) very high transparency use (fur, grass, particles, many far away objects) so MSAA not so effective for FSAA.

None of those things would make it a technical impossibility, though, as far as I know (?). Anand's article suggests there's a fundamental barrier to using MSAA in the title.

 

[leechan25]

What's This!

Hey Version!

That's the four core processor I was talking about! So RSX could be a multi core GPU!

 

[Tahir2]

How about a G70 with PureVideo and CineFX removed and a quad disabled?
That would give it 20 pipelines.
Why the need for so many vertex processors as well? Cut it down to 6 too.. you have Cell to help you with vertex processing.

 

[rendezvous]

My guess on the RSX(its almost CES time), i suggest everyone start guessing! cuz its the last chance you'll get...

My guess is that we won't get any new information regarding RSX during CES.

 

[Urian]

The RSX could be made using the diagram of the Visualizer:

-G70 is the equivalent of the PPE in the Visualizer.

-It has 4 SPE, in this case with 128KB of Local Story Each.

-The Image Cache are the 256MB of GDDR assigned to the gPU.

-PureVideo, CineFX and other techologies are removed.

-DirectX 7 Relationed techologies are removed.

-The base is the GeForce 7800 Mobile.

 

[Carl B]

The RSX could be made using the diagram of the Visualizer:

-G70 is the equivalent of the PPE in the Visualizer.

-It has 4 SPE, in this case with 128KB of Local Story Each.

-The Image Cache are the 256MB of GDDR assigned to the gPU.

-PureVideo, CineFX and other techologies are removed.

-DirectX 7 Relationed techologies are removed.

-The base is the GeForce 7800 Mobile.

I'm honestly thinking that when Version posted that patent drawing he was implying just such a possible layout as you've described. Is that drawing from the Visualizer patent by the way? It's certainly what it evokes in my mind, but it's been a long time since I've read through it.

All of that said though, I myself am being conservative and thinking RSX will *not* resemble a Cell/G7x hybrid, though I'd enjoy being wrong if only for the novelty of it all. Hopefully we'll find out sooner rather than later.

 

[Urian]

Before the news of Nvidia making the PS3 GPU with Sony I ever saw the Cell+Visualizer Like the EE+GS. In the case of Cell+Visualizer the Cell doing the Vertex Shader Work, and in the case of the Visualizer 4 SPE+Graphics Synthethizer for doing the Pixel Shader works.

But the evolution of the Shader Technologies sure transformed the Visualizer first design in an outdated design.

 

[Arun]

Single-chip G80-class hardware with 8 ROPS?
Okay, kill me. It does coincide with the G80 timeframes perfectly but whatever, it won't happen. And yes, it does coincide, and the bus controller is modulable and could be glued on a G80 derivative. Anyway, just don't listen to me, or you might get infected by logic going wrong.

Uttar

 

[DeanoC]

Lol

That diagram appears to be missing the quad hamster wheels...
There has been a lot of dev pressure to replace one of the hamster wheels with a coffee machine to improve the development environment and SDK.

Bugger wonder if I've let Sony's big secret out now...

 

[Nicked]

Admitting theres a big secret eh?
*waits for Spong, TheInquirer, Joystiq etc. to pick up this AMAZING scoop*

 

[Brimstone]

Single-chip G80-class hardware with 8 ROPS?
Okay, kill me. It does coincide with the G80 timeframes perfectly but whatever, it won't happen. And yes, it does coincide, and the bus controller is modulable and could be glued on a G80 derivative. Anyway, just don't listen to me, or you might get infected by logic going wrong.

Uttar

RSX = Console version of G80 is my opinion also. As far as bus technology and such, I suspect Rambus technology will be involved.

 

[Edge]

As far as bus technology and such, I suspect Rambus technology will be involved.

That's a given when connected to CELL, but the memory bus will not be using Rambus technology.

 

[Belmontvedere]

I'm hoping for a clock speed increase. It would be nice if RSX was atleast close to G71 in clock speed. A 256bit bus would be nice too...

 

[weaksauce]

I'm hoping for a clock speed increase. It would be nice if RSX was atleast close to G71 in clock speed. A 256bit bus would be nice too...

If a 256bit bus doesn't affect the yield, why aren't they using it? Because of cost?

edit: hey I'm gonna ask a stupid question now but has sony said what memory bus rsx has?

 

["Nerve-Damage"]

If a 256bit bus doesn't affect the yield, why aren't they using it? Because of cost?

Sony may not use the 256-Bit memory interface because of future problems arising from shrinking or reducing the RSX GPU die size.

edit: hey I'm gonna ask a stupid question now but has sony said what memory bus rsx has?

Officially I don’t think so (From the E3 Presentation)………..