AMD: R9xx Speculation

Discussion in 'Architecture and Products' started by Lukfi, Oct 5, 2009.

  1. Shtal

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    Can you approx guess what will GTX580 be like in the same game setting against R6970 ??
     
  2. Babel-17

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  3. ZerazaX

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    ~10fps for the 5870 and ~23 FPS for the 6970 if I'm reading that correctly
     
  4. Mize

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    Lower than which? $299? No way :)
     
  5. Babel-17

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  6. ZerazaX

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    Even if it's a 25% boost for 2GB as in that review, it'd still trail 23 to 14-15

    Anywho I wrote this piece as my theory for why all the reviews are all over the place. This is my own speculation based on the #'s. Cayman is really interesting the more that I delve into it:

     
  7. Babel-17

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    At 1900 x 1200 the added memory didn't do anything notable but they weren't using AA.

    At 2560 x 1600 the 1 GB cards failed.

    So I guess for Metro 2033 we need a benchmark where we can eliminate the amount of memory being an issue.

    Edit: The 5970 only has 1 GB per chip afaik.
     
  8. gamervivek

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    and where is DC and tessellation running exactly?:roll:
    Last I saw cayman numbers, it was battling gtx480, winning some, losing some; so a lead in most games is proof the drivers have gotten better since then. Or in worst case scenario, the games amd used in the earlier posted slides are in which 6970 works quite well.
    As for Antilles, I won't put much faith in CF if the single card drivers were barely better.
     
  9. Rangers

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    Targeting your opponents last gen highest chip seems like a recipe to assure losing.
     
  10. gamervivek

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    gtx580 wasn't out then.:wink:
     
  11. Rangers

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    Isn't that the point?

    Your opponent is never going to sit still, presumably.

    Edit: unless you're joking.
     
  12. Dave Baumann

    Dave Baumann Gamerscore Wh...
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    Not always. ;)
     
  13. mczak

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    Actually, if you take clocks into account, it's not just 96%, it's 100%.
    For it to be 20% slower in perlin noise under the (optimistic...) assumption that utilization is 100% for VLIW-5, the test would need about 10% of the instructions to be transcendentals (or other t-slot exclusive instructions). (That is, if you have 50 instructions 5 of them transcendentals, you could ideally execute that in 10 VLIW-5 instructions - with VLIW-4 those 5 transcendentals translate to 15 slots hence 60 slots in total, so 15 VLIW-4 instructions, then taking into account (slight) clock difference and more simds.)
    Of course, this is very simplified, depending how instructions can actually be bundled together.
     
  14. Jaaanosik

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    Hey, Dave, on scale 1-10 how hard, stressful was this release? :)
     
  15. ZerazaX

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    Thanks for the info. Been a long time since I got to play with architecture stuff since I've been out of EE for a while :razz:

    Good catch on clocks. I'd love to see the Perlin Noise figures after a few rounds of drivers/optimizations... would be interesting to see where the gap is coming from


    I'd lvoe to see another one of those Anandtech behind the scenes stories from AMD. Those are the best features by far
     
    #6295 ZerazaX, Dec 13, 2010
    Last edited by a moderator: Dec 13, 2010
  16. gamervivek

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    nice, though october slides and still TBD in place of shaders

    clocks of various blocks?

    and ati have their own CSAA now, how many AA modes does that make..:shock:

    and faster double precision@1/4 the SP rate.:lol:

    gtx480 was the top card, so the performance was being compared to it.
     
  17. Rangers

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  18. cho

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    I think you should set the powertune as +20% or just disable the powertune(howto?) before test the perlin noise that is a fillrate-like test.
     
  19. Kaotik

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    [​IMG]

    The average increase over 5870 on 6970 is bigger than average lead GTX580 has over 5870
     
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