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[aaaaa0]

Actually Xenos only has the bandwith to sustain half the fillrate with FP16.

There are a couple other reasons Xenos can sustain half-fillrate with FP16, AFAIK the EDRAM bandwidth was set because of those design choices not the other way around.

 

[midnightguy]

In Faf's dreamland RSX will have 512-1MB SRam shared for FB and texel cache so all we'll need to do is be a little carefull on access coherency like we did on GS to keep it happy.
... back in the real world, ... I doubt 128bit FP has much purpose for rendering. It could be there mainly for helping RSX<->Cell communication, or in the worst case it's a marketting ploy similar to XeCPUs FP ratings... Though that'd be a very expensive ploy, transistor wise...


Actually Xenos only has the bandwith to sustain half the fillrate with FP16. Of course the same shader heavy argument applies that you already pointed out.
And the few rendering portions that might saturate Xenos peak fillrate won't need FP buffers to render into.

Faf, I would love to see a FULL list of dream-specifications for both PS3 and X360

 

[midnightguy]

I think they'll share a lot of technology, so from that perspective I think the G70's unveiling should be useful, but I think RSX will be closer to an Ultra version of that technology than the GTX. Then again it may be closer to the G80 (less likely, of course). The precise relationship between RSX and G70 is currently unclear. I'm expecting some differences, for example, RSX will have 128-bit framebuffers and blending, partially to accomodate data exchange with Cell I imagine, something I'd be surprised to see in their desktop parts.

So G70 should be useful, but I think many questions will still remain.

All of the above aside, I'm more hopeful that once G70 is unveiled, we won't be left waiting long, if at all, for specific details on RSX. I think a lot of the information will be common to the PC parts, but it'd be nice to get specific details on it, to keep us from guessing if nothing else. I think the only reason we've had little to no detail on it is because of NVidia's desire to protect competitive secrecy for their PC parts, but once they're unveiled, there's little reason for them not to talk about RSX too. Unless they've a policy of waiting till a chip has taped out or to be finished, which may not have happened yet in RSX's case.

good points.

I expect RSX to be inbetween G70 and G80, not unlike NV2A Xbox1 GPU was inbetween NV20 and NV25

 

[rc213]

GeForce 7800GTX Retail Fact Sheet

 

[dorio]

GeForce 7800GTX Retail Fact Sheet

Cool! I wonder how many trannies that tv encoder uses and is it part of the trannie count. Wonder will the ps3 use that or have a separate card like the 360 that will handle that. Also I wonder what it will take to support 128-bit rendering and blending vs. the 64-bit this card supports and what is the quality difference between the two.

 

[Mrbob]

What gets me is that Nvidia is having trouble pushing out a 450+ MHZ part and all of a sudden RSX is going to run at 550 MHZ? I smell downgrade in clock speed.

The X800XT hits 500MHZ core and the 850XT hits 540 MHZ core so we know ATI can hit 500 MHZ. I'm extremely skeptical Nvidia can do the same and the initial 550MHZ number is put out for PR reasoning.

 

[rc213]

What gets me is that Nvidia is having trouble pushing out a 450+ MHZ part and all of a sudden RSX is going to run at 550 MHZ? I smell downgrade in clock speed.

The X800XT hits 500MHZ core and the 850XT hits 540 MHZ core so we know ATI can hit 500 MHZ. I'm extremely skeptical Nvidia can do the same and the initial 550MHZ number is put out for PR reasoning.

Considering a 400mhz core 6800 Ultra runs neck and neck with a 540mhz core x850 XT in gaming performance I doubt they put much effort into pushing the 6800 further. Hopefully they are having better luck with the new G70 cores.

 

[Pimpwerx]

What gets me is that Nvidia is having trouble pushing out a 450+ MHZ part and all of a sudden RSX is going to run at 550 MHZ? I smell downgrade in clock speed.

The X800XT hits 500MHZ core and the 850XT hits 540 MHZ core so we know ATI can hit 500 MHZ. I'm extremely skeptical Nvidia can do the same and the initial 550MHZ number is put out for PR reasoning.

90nm vs. 110nm. Summer 05 vs. Spring 06. PEACE.

 

[Mrbob]

NV30. PEACE.

Will Nvidia hit their target? Maybe. But I'm not going to go by blind faith at the moment. I'll believe it when I see it.