AMD: R8xx Speculation

Discussion in 'Architecture and Products' started by Shtal, Jul 19, 2008.

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How soon will Nvidia respond with GT300 to upcoming ATI-RV870 lineup GPUs

Poll closed Oct 14, 2009.
  1. Within 1 or 2 weeks

    1 vote(s)
    0.6%
  2. Within a month

    5 vote(s)
    3.2%
  3. Within couple months

    28 vote(s)
    18.1%
  4. Very late this year

    52 vote(s)
    33.5%
  5. Not until next year

    69 vote(s)
    44.5%
  1. fellix

    fellix Hey, You!
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    Not much obviously -- NV40 and G70 series shared a whole ALU for it, but it's the sampling that is the dirty work, IMHO.
     
  2. Jawed

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    The addressing in NVidia's older GPUs ALUs is really just texture coordinate interpolation (calculation of the current pixel's texture coordinate, based on the 3 corners of the triangle and the texture coordinates at those 3 corners). Which the current GPUs also do in the multifunction interpolator ALU.

    [​IMG]

    That's the "Project" part.

    The TA part of NVidia's current GPUs is taking the coordinates, LOD and bias information to work out the address in RAM of a texel. That's the LOD and Address lines.

    Jawed
     
  3. Jawed

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    That may well be true.

    My assertion is that RV730 with 4 clusters with 4:1 ALU:TEX, instead of 8 clusters 2:1, would perform the same. But, not knowing the effect on most games of fp16 texture filtering (even at budget gamer settings?) I'm leaving a question mark over that conclusion.

    In games with no fp16 filtering we can see this is probably true, because RV670 has exactly that configuration. HD3870 has more bandwidth and twice the colour rate of HD4670, though, but it does have the same Z rate. Generally HD3870 was slightly faster than HD4670 - don't know if things have changed.

    Jawed
     
  4. neliz

    neliz GIGABYTE Man
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    [​IMG]
    [​IMG]
    [​IMG]

    1GB, less capacitators than on RV740. Board is a lot cleaner.
     
  5. rpg.314

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    which tree/chip/plant/bush/card is this one? :)
     
  6. neliz

    neliz GIGABYTE Man
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    Juniper XT ES, Water it weekly.
     
  7. fellix

    fellix Hey, You!
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    Meh -- drop one of the DVI ports and make room for all the hot air out. :p
     
  8. LordEC911

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    Meh, 4870/4890 performance w/ a 6pin at a (current) 4850 price...
    Who wants that???

    Edit- added the ()
    Re-edit- Nice usage of the "original" RV740 cooler.
     
  9. fellix

    fellix Hey, You!
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    You only wish so! :lol:
     
  10. Jawed

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  11. mboeller

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    from 3dcenter ([fu]121Ah@work ):

    8 memory chips on the front (can be seen on the old picture, or?) and 4 memory chips on the bag side (new picture) => 384bit ???
     
  12. neliz

    neliz GIGABYTE Man
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  13. Jawed

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    I can't find a 1GB HD4770. Neither the European nor US XFX sites have it.

    Jawed
     
  14. neliz

    neliz GIGABYTE Man
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  15. w0mbat

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    The one with 8 in the front was Cypress, the one with 4 in the back Juniper.
     
  16. fellix

    fellix Hey, You!
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  17. Jawed

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    What's going on with the top side of the heatsink retention clip? That side of the square is mostly "missing".

    Jawed
     
  18. trinibwoy

    trinibwoy Meh
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    Wow, you've got a sharp eye.
     
  19. no-X

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    isn't it just a reflection? similar (but smaller) strage things are on the other edges of the clip, too
     
  20. Jawed

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    Yeah, I think you're right, I can see a hint of an edge amongst the "check pattern".
     
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