AMD: R7xx Speculation

Discussion in 'Architecture and Products' started by Unknown Soldier, May 18, 2007.

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  1. sireric

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    Gotta get some popcorn!
     
  2. Megadrive1988

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    Wait, what is the "96 Shader" chip Orton talked about awhile ago? I'm confused. You mean the 480 SP RV770 that turned out to be a ruse?
     
  3. Silent_Buddha

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    Argh time flies when you get older, but right now it's not flying fast enough. :)
     
  4. 3dcgi

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    GDDR5. And Rys said it was pad limited with 8 SIMDs so it was smaller.
     
  5. Farhan

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    maybe it was just VERY pad limited... :p
     
  6. silent_guy

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    That's really puzzling. The way thing normally go, final area is always larger than initially estimated. I've never seen it otherwise...

    This really points to some serious design methodology changes along the way.
     
  7. Pete

    Pete Moderate Nuisance
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    I think it's from here (discussed here and later here). So, back in R600 speculation. "Some" time ago is right. :)
     
  8. fellix

    fellix Hey, You!
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    Now, I know what I want to see *fixed* in the next full/half node refresh of the architecture! :grin:
     
  9. Jaaanosik

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    AT is up here.

    It seems HD4870 tops GTX260 here as well.
    In many cases it's as good as GTX280 at 16x10.
     
    #4749 Jaaanosik, Jun 25, 2008
    Last edited by a moderator: Jun 25, 2008
  10. Silent_Buddha

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  11. Dave Baumann

    Dave Baumann Gamerscore Wh...
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    Starting point was the cost target. The initial specification was 150% over R600, however the engineering focus was area optimization, so once they got underway the efficiency gains mean we could be 8 SIMD's (200% R600); a little while later, due to further gains, GDDR5 and a couple of other things, we were pad limited at 8 again, so the additional 2 SIMD's were lobbed in. And I'm not complaining about that! :)
     
  12. Rangers

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    Great and AT is currently down for me :0

    And I dont see any other reviews yet..
     
  13. AlphaWolf

    AlphaWolf Specious Misanthrope
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    hexus has a review up also.

    AT is getting hammered, all of you stop hitting F5 dammit!
     
  14. Pete

    Pete Moderate Nuisance
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    FYI, the 4870 review thread is here.

    Anyway, if this thread stays open until Rys publishes B3D's piece, I'd like to know what's up with RV770's idle draw. People here who seem to be in the know have said it's the drivers, but I haven't seen it mentioned specifically in any p/review, not even the new ones, so has AMD officially briefed ppl about it?
     
  15. AlphaWolf

    AlphaWolf Specious Misanthrope
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    I think people are basing it on the idle speed of the rv770, its idling at 500mhz instead of the 300 that the rv670 idles at. I don't know that it's a bug.
     
  16. Psycho

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    Please let it stay a little longer if needed, until it reaches 4850/70 posts, it's so close now :lol:
     
  17. ZerazaX

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    Can't wait for the architecture analysis... looks like ATI really did a TON here
     
  18. ZerazaX

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  19. Shadowmage

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    Could you expand a bit on what you mean by "area optimization"? Was the optimization at an architectural level (as in changing the function and structure of units) or at a synthesis level (making the synthesizer choose smaller cells, improve area utilization and routing, using custom standard cells (FAST14????)).

    Also, can you tell us if parts of the chip were built full-custom? It would seem like the shader units would be the perfect target for this. I had a theory that in R600/RV670, the shaders were synthesized/semi-custom while in RV770 the shaders are full-custom. This seems somewhat plausible due to the vast improvement in area that full-custom offers. Is there any truth to this?
     
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