AMD: R7xx Speculation

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

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  1. AlphaWolf

    AlphaWolf Specious Misanthrope
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    it probably runs hot because the aibs suck at installing the hsf.

    from here

    That shouldn't be too big an impediment for anyone who wants to get the most out of the card.
     
  2. Silent_Buddha

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    If we assume that's actually a working proto-type or reference R700...

    Look closely at the power connectors there's a 1x6 and 1x8. However, there are only 2x6 pin power connectors connected to the board. Meaning it's possible that R700 will consume less than 225 watts. :shock:

    Regards,
    SB
     
  3. Wirmish

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    1. 9800GTX+ is expected to cost $229... in july or later.
    2. So it's a smaller 9800GTX... hum... a smaller OC 8800 GTS... no ?
    3. How do you know that ? 65nm yields vs 55nm ?
    4. ---> link

    EDIT: Good scaling no ? -> CoD4
     
  4. willardjuice

    willardjuice super willyjuice
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    Well according to TweakTown even the 4850 has two dual-link ports:

     
  5. randomhack

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    any thoughts about a possible 4850 gddr5? or at least a higher memory clock?
    Its a bit strange that 4850 has such a low memory bandwidth.
     
  6. AlphaWolf

    AlphaWolf Specious Misanthrope
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    I don't think you'll see AiB's using GDDR5 on lower margin parts for now (assuming it's allowed). If you want the bandwidth you'll probably have to buy a 4870 or overclock the memory.
     
  7. Blazkowicz

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    well it's called the 4870!
    anyway AMD seems to do just fine with the "low" bandwith and quantity of ram of a 4850, matching a 8800 ultra is nice.
     
  8. armchair_architect

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    So? If all you cared about was theoretical GFLOPs/mm^2, you could do FAR better than RV770. What matters is achievable GFLOPs/mm^2 on real-world (not contrived) workloads. RV770 wins by that metric too, of course, but not nearly to the same degree.
     
  9. Kaotik

    Kaotik Drunk Member
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    Of course GDDR4 and 5 are different things, but there was 3850's with GDDR4 too, IIRC
     
  10. randomhack

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    well the card does do very well with the current bandwidth. but I was wondering if this bandwidth will be enough to give a correspondingly large boost for GPGPU apps.
    most GPGPU apps appear to be bandwidth constrained IMO?
    perhaps AMD tweaked the cache or the register file .. but that will soon be known i hope.
     
  11. digitalwanderer

    digitalwanderer Dangerously Mirthful
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    I think they just packed it chock full of driver bunnies and fairy dust. :yep2:
     
  12. Miksu

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  13. dizietsma

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    I think that is the crux of the matter, how will a 700MHz 4850 stand against the AIB overclocked versions of the 9800GTX + which you would sensibly assume to be out about 800MHz or so given the normal + 70MHz overclocks the AIB typically do.

    I think it will be pretty close.
     
  14. AlphaWolf

    AlphaWolf Specious Misanthrope
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    That has to be some driver issue, I really can't see that being the extra lanes.
     
  15. Kaotik

    Kaotik Drunk Member
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    Indeed, the differences between x16/x4 (P35) vs x16/x16 (X38) on last gen cards were a joke compared to this - they actually seem to saturate the x16 PCIE 2.0 buses for good now
     
  16. dizietsma

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    Incontrovertibly right. The first opterons where released back in 2003 or so and 5 years later the vast majority of desktops still uses 32bits. As for milking and innovators, AMD milked the K8 for far far too long.
     
  17. Sunday

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    apparently they've managed to shrink G92 for only 11%!!

    http://www.bit-tech.net/news/2008/06/19/nvidia-has-9800-gtx-55nm-g92/1

    "On the back the new 9800GTX+ core components look slightly smaller and the new 55nm G92 is 17mm square versus 65nm G92 which is 18mm square! Whoooo!"
     
  18. Arun

    Arun Unknown.
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    There's already a thread for G92b now, please don't pollute this one... ;) (and I already saw that some time ago and my estimate based on the die shot and some skewing was 255-275mm², similar to what is now being discussed in the other thread)
     
  19. Dio

    Dio
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    You think? I disagree. If you look around at a modern game nowadays, the minimum spec is typically a 9700 or 9600, and the entire FX series is nowhere to be seen. But:
    - it still sold
    - it took a good six months before the web realised the mud was being slung
    - the paper press never really picked up on it at all

    Negative press generates a lot of anti-source light and heat on the web, but even there the bad feeling doesn't really last beyond when a decent product actually tips up. You'd like to think that their reputation would be intracontravertibly soiled, but that's just not the case.

    It's like negative political advertising. Just about everyone involved in politics frowns on it and tut-tuts, but it works.

    Sad but true.
     
  20. Neb

    Neb Iron "BEAST" Man
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    How about it being the cards running out of VRAM (its high res with AA and AF). So they have to swap to RAM and the 2x16 lanes then beats the 2x8 lane configuration in throughoutput GPU <-> system RAM.
     
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