G80 rumours

Discussion in 'Pre-release GPU Speculation' started by IbaneZ, Feb 21, 2006.

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  1. IbaneZ

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    http://www.xbitlabs.com/news/video/display/20060220100915.html

     
  2. LVSeminole

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    I know what they mean(I think) when they say hybrid. But, I dont get what they mean when they say "dedicated". I am taking "dedicated" to mean about the same thing as unified. Now, maybe this means the Vertex and Pixel shader processors work independently of each other.

    This is all assuming I am right in thinking the NV40/G70 dont opterate independently in that sense.
     
    #2 LVSeminole, Feb 21, 2006
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  3. Geo

    Geo Mostly Harmless
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    Whee! 48ps and some unknown number of vs (but unlikely to be less than 10). Plus HDR/AA, recently confirmed. Even at 80nm that sounds pretty aggressive.
     
    #3 Geo, Feb 21, 2006
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  4. Farid

    Farid Artist formely known as Vysez
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    I heard most part of this rumor... Except the 48 PS part, which is new.
     
  5. stevem

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    It does sound good, & fits well with G71 rumours/timeframe.
     
  6. Hellbinder

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    So it will be an R580??? :?:

    That hardly seems to make any sense :!:

    R600 is 64 unified Shaders, with an enhanced scheduling logic based partially off Xenos.
     
  7. ants

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    I'm guessing that they took the TMUs out of the Pixel pipes and are now sharing them between the VS and PS units. Hybrid design?

    The 48 pixel shaders seems a bit low though, very high clocked part (if expecting 2x previous generation)?
     
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  8. ants

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    How many texture units?
     
  9. Basic

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    There were probably a negation missing there, but just to make it clear.
    No in this case "dedicated" means the opposite of "unified". VS and PS are different parts of the hardware. They should have the same capabilities from a software pov though.
     
  10. Kombatant

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    Care to explain your certainly about that?
     
  11. KimB

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    I won't comment on Hellbinder's certainty, but that sounds close to correct. But the texture units are a big question: will it be like the Xenos with one set of 16 bilinear sample texture units, and one set of 16 point sample texture units? Twice that seems highly unlikely.
     
  12. Ailuros

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    Pardon if I twinch when I read about 48 pixel processors these days. Is that an ALU, a SIMD channel or anything else?
     
  13. KimB

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    Agreed. Not close to enough is known about the supposed architecture the rumor is about to say anything about what that means.
     
  14. JHoxley

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    I'm not 100% clear on where the various chip codenames fall into place...

    The G70 is out now, the G71 expected soon? This G80 is therefore the next generation (GeForce 8 series?) product.

    By them saying "hybrid" would it be realistic to read that as a "We have some D3D9 hardware that we bolted some extra goodies on so that it fits the D3D10 specification"? Rather than being a chip that was built from the ground up to be a D3D10 part first and a legacy/D3D9 part second?

    Jack
     
  15. KimB

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    Well, nVidia's never going to throw out all of the previous R&D and design an utterly new architecture. That'd be a big waste of resources. So no matter what, we're going to see the heritage of the NV4x architecture in the G80.

    In the end, though, it all comes down to performance. For example, DX10 still has vertex and pixel shaders, though the instruction set is now identical between the two. This doesn't necessarily require a unified pipeline design, and such a unified design would be a performance optimization.

    So this may be all that the rumor is stating: that it isn't unified. This doesn't say anything about the performance of some of the things that DX10 requires, which will be interesting to see.
     
  16. Ailuros

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    I'd speculate for G80 that there won't be separate units for GS/VS; it could be the origin of the "hybrid" rumour.

    G80 according to what many speculate so far sounds like the first step into the USC direction and in that regard I don't expect to see as many common aspects with NV4x actually.
     
  17. overclocked

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    Its almost a fact or 99% that ATIs SM4 part is Unified .
    Is there more than me that for the sake of ATIs statements about effeincy rather dont see a unified approach in nVidias SM4 part because of the more interesting comparisons between the two?
     
  18. Ailuros

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    Most likely it will be the case. There will definitely be longwinded debates about unified and non-unified, which is expectable from a technical POV, but if you ask me it's more important what comes out at the other end.
     
  19. phenix

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    So it will be G80 vs R600

    Does that mean NV50 will be competing aginst R700 or there will be no NV50 at all?
     
  20. Fodder

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    NV50 was the successor to NV40, NV47 was spun off into G70, G80 is the successor to G70. You do the math. :wink:
     
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