Official speculate before its too late: RSX Spec thread

[ROG27]

Stolen from Saibo (PSINEXT forum):


Quote:
Originally Posted by Pistolero
Is that your dream GPU ?


of course it is! ; ), i mean who wont want a RSX with G70 controlling 4-6 specialized core !? Great for hilbert tile rendering and creating realistic images(Monte Carlo)

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

RSX,design somewhat like the Cell, it does away with the tradition long GPU pipeline appoarch. In Cell the PPE is the main process, in RSX a custom G70 is the main processor. Custom as in no pure video, no ultra shadow 2, no cineFX.

The PPE in cell can control the SPE, in the RSX, the custom G70 core can control 4-6 specailized multi-purpose multi-way programmable core( vertex shadering, pixel shading, lighting,etc).

Synergistic Media Element (SME, aka visualizer) handles all vertex,shading, lighting(direct/indrect), shadow calculation

G70x, handles antialiasing, post process, motion blur.
__________________
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[pakotlar]

do u expect it to be 500-600 trannies? because what you just described would be absolutely ENORMOUS on 90nm.

 

[Bliss]

Sony/nvidia could have conceived the RSX in the way I've just seen in the picture above...
...similar to the Cell...let's wait and see...

 

[Nicked]

Essentially a 7800GTX with a few interesting ways to transport data to and from CELL, very fast, very simple, very competitive. Might be a significant alteration or two, but that may be expecting too much.

 

[weaksauce]

Well if sony wanted to have a second cell as "graphics systhesizer" in the beginning they might as well have done the RSX into another Cell.

 

[Bad_Boy]

Any chance its related to the G71?

 

[Shinjisan]

It's probably a customized G71 @550MHZ (vs the 700MHZ predicted for the PC part),with a few pipelines disabled for redundacy (Kutaragi said they would use redundacy also for the GPU) and a few features from G80 and of course all the optimizations to work with Cell and FlexIO.

 

[version]

 

[!eVo!-X Ant UK]

Any chance its related to the G71?

Why does every one think that the G71 and G72 are better than the G70?? there NOT..from the my understanding the G71 and G72 are like the 6200 and 6600 of the G70 family.

 

[weaksauce]

Why does every one think that the G71 and G72 are better than the G70?? there NOT..from the my understanding the G71 and G72 are like the 6200 and 6600 of the G70 family.

No, g71 is the 7900. G72 and G73 are the slower ones.

 

[!eVo!-X Ant UK]

Any way my speculation.......

Standard G70 with, PureVideo, CineFX, Pure shadow REMOVED.
Its a 32 pipe line design with 2 pipe's DISABLED for redundancy, Totaling 30 pipe's.
Vertex Pipe's remain the same as the G70 i.e. 8 of them as any extra vertex processing would be past to Cell.
Custom Link to Cell, and its SPE's for post processing, Graphics sharing.
4Meg Of turbo cache, this Also ensuring PS2 GS backwards Compatability.
Maybe some extra Work to allow for HDR+FSAA at the same time.
Other various pipe line tweaks for extra efficiency.

Thats your lot.

 

[MasaC]

Maybe some extra Work to allow for HDR+FSAA at the same time.

Why do people state that HDR+FSAA (full scene antialiasing) isn't possible at the same time on the g70? I was under the impression the g70 couldn't handle HDR+MSAA (multisampling AA) but indeed can handle HDR+SSAA (supersampling AA) at the same time.

 

[!eVo!-X Ant UK]

Why do people state that HDR+FSAA (full scene antialiasing) isn't possible at the same time on the g70? I was under the impression the g70 couldn't handle HDR+MSAA (multisampling AA) but indeed can handle HDR+SSAA (supersampling AA) at the same time.

Good point, im going to have a read and a check up.

 

[Dave Baumann]

Its not even true to say "HDR + MSAA" are not capable since there are many methods of implementing HDR. It is only true to say that on NV4x/G70 FP16 Blending and MSAA are not possible. (Note: from a performance perspective SSAA isn't desirable since it replicates all the render work for the depth of AA - i.e. if you are using 4x SSAA then for each pixel you'll be passing through the textures, pixel shaders and ROPS 4 times)

Ant UK - NVIDIA hasn't yet implemented redundnacy at anything less than a quad level, ergo if pipeline redundancy is used then 4 pipes will be the minimum disabled.

 

[Laa-Yosh]

Why do people state that HDR+FSAA (full scene antialiasing) isn't possible at the same time on the g70? I was under the impression the g70 couldn't handle HDR+MSAA (multisampling AA) but indeed can handle HDR+SSAA (supersampling AA) at the same time.

The general consensus is that SSAA has a performance penalty big enough to keep developers from using it. Some games (like Baldur's Gate on PS2) might be able to incorporate it though.

 

[!eVo!-X Ant UK]

Ant UK - NVIDIA hasn't yet implemented redundnacy at anything less than a quad level, ergo if pipeline redundancy is used then 4 pipes will be the minimum disabled.

Oh i did'nt know that, Many thanks.

 

[Shinjisan]

Its not even true to say "HDR + MSAA" are not capable since there are many methods of implementing HDR. It is only true to say that on NV4x/G70 FP16 Blending and MSAA are not possible. (Note: from a performance perspective SSAA isn't desirable since it replicates all the render work for the depth of AA - i.e. if you are using 4x SSAA then for each pixel you'll be passing through the textures, pixel shaders and ROPS 4 times)

Ant UK - NVIDIA hasn't yet implemented redundnacy at anything less than a quad level, ergo if pipeline redundancy is used then 4 pipes will be the minimum disabled.

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

 

[ihamoitc2005]

Black & White 2

The general consensus is that SSAA has a performance penalty big enough to keep developers from using it. Some games (like Baldur's Gate on PS2) might be able to incorporate it though.

Black & White 2 is 4xSSAA and 29-30fps for 512MB 7800GTX on benchmark, I think on Anandtech.

 

[!eVo!-X Ant UK]

Black & White 2 is 4xSSAA and 29-30fps for 512MB 7800GTX on benchmark, I think on Anandtech.

At what resolution??

 

[Shifty Geezer]

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