Nvidia G71 - rumours, questions and whatnot

Discussion in 'Pre-release GPU Speculation' started by ToxicTaZ, Dec 4, 2005.

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  1. aaronspink

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    Its fairly reasonable to assume that the nominal clock speed for the G71 will be roughly equivalent to the nominal clock speed for the RSX. In general, between whole processes, you'll get a clock speed increase on the order of 25-35% which would put the G71 at a nominal frequency of somewhere between 540 and 580 MHz.

    In order to significantly increase the glock frequency of the G71 they will either need to increase the nominal voltage or do some significant re-pipelining and speed path work. So it is probably reasonable to assume that ATI will stay arround their nominal clock frequencies with maybe a small 5-10% boost at most from speed path work, while Nvidia will get on the order of a 25-35% speed boost from the newer process and some speed path work.

    Aaron Spink
    speaking for myself inc.
     
  2. Shadowmage

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    My team mates got us signed up for meetings with both NVIDIA and ATI, fun times await! :)

    BTW if you guys have questions you want answered officially... -> PM

    (I work at www.laptoplogic.com btw )


    I really don't think 700mhz will be achieved with G71...

    450mhz x 1.25 = 565mhz, not even close
     
  3. Razor1

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    550x1.25= 688 . But then there is low k which gives around 30% before the process drop. So 700 they should be able to get it up there.
     
  4. ninelven

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    But G70 is already at 550 MHz with good yields... /boggle
     
  5. BRiT

    BRiT (╯°□°)╯
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    It is? Then why is the 7800 GTX 512M not available???
     
  6. BRiT

    BRiT (╯°□°)╯
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    If they go with 700Mhz, will those parts be available in any sort of quantity or anywhere under $200 over their MSRP? They sure as hell arn't for their 7800 GTX 512M.
     
  7. KimB

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    Well, that could be due to either yields of the core, or supply of the memory.
     
  8. Razor1

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    Possibly, but even at 450 with low k will get it to 600, then even 17 % for the process drop will take it to 700. And this is of course transistor count doesn't change.
     
    #408 Razor1, Dec 28, 2005
    Last edited by a moderator: Dec 28, 2005
  9. ninelven

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    Oh I don't know....

    GTX 512 - 1700MHz memory
    R580 XTX - 1550MHz memory
     
  10. Shadowmage

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    That's basically an overvolted regular core, as proved by overclockers who increased voltage to their 256MB version G70s and got similar clock speeds at 1.5v
     
  11. ninelven

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    Obviously, but that has nothing to do with yields. Something is either getting acceptable yields at a certain clockspeed or it isn't. G70 yields @ 550Mhz are just fine.
     
  12. Razor1

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    yeah but you can still increase volts on the 512 too

    http://www.nordichardware.com/Articles/?page=9&skrivelse=453


    Oh yeah found this also

    http://www.tsmc.com/english/b_technology/b01_platform/b010101_90nm.htm


    now .13 to .11 wasn't really to improve performance as it was to increase number of chips per wafer. So 100% improvement in performance/clock speed, seems a bit to high, but 50% sounds reasonable. ATi definity got 100% if not more from .13 to .09, thier core also increased in size quite a bit.
     
    #412 Razor1, Dec 28, 2005
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  13. Skrying

    Skrying S K R Y I N G
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    What? The only shipping cores of G70 at 550Mhz is on the 7800GTX512MB, where in the hell can I find one of those? Just because people reach them all the time through OCing doesnt mean that yields are good for that core speed.
     
  14. walterman

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    1 GHz vs 1.2 GHz memory clock. And prolly the PS units in the XL aren't outputing enough pixels to the ROPs. At huge resolutions with AA, if the PS units aren't bounded, the ROPs (& mem speed) will be the bottleneck. Also, i thought that 500 MHz was the default core speed in the XL. (http://techreport.com/reviews/2005q4/radeon-x1000/index.x?pg=4)
     
  15. KimB

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    The resolution that you're running at really doesn't affect how bounded or not bounded you are by ROP's by any significant amount. It's all about what kind of load the software is putting on the GPU.
     
  16. ninelven

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    The reason you can't find one isn't because the core is unavailable... it is because the memory is.
     
  17. karlotta

    karlotta pifft
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    I'd say the reason is, they are cherry picked cores and very few. The stock pile they are getting is waiting for the 900gddr3, so they can have a 700$ card that is the fastest, and you wont see any real amount of them EVER. the G71 will be the 900gddr3 card, and the 580refresh will have 900gddr3 too. IMO.
     
  18. AlphaWolf

    AlphaWolf Specious Misanthrope
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    Got proof?

    While I find that it is likely, you are stating it as if it is a known a fact, if you have evidence to support this claim, I'd love to see it.
     
  19. neliz

    neliz GIGABYTE Man
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    Reports have been there allready that Samsung has the memory in full supply, they aren't the ones that have the problem.
    Along come the reports that the 512 has been cherry picking with a batch of 4000 cards in mind and henceforth the conclusion, retailers are removing the parts from their system

    (that and the fact that, according to L'inq, that there are only two people who they know of that actually got 512's to run in SLI.) http://www.theinquirer.net/?article=28588

    on the MIA part:
    http://www.theinquirer.net/?article=28503
    http://www.theinquirer.net/?article=28257
    http://www.theinquirer.net/?article=27552

    There are less than 100 cards in europe (http://www.geizhals.at/?sourceid=Mozilla-search&fs=geforce+7800+GTX+512) and if you plan on spending 1150 Euro on a card that will be obsolete within a month, by all means, go ahead.
    Fact is, the gtx512 is not stillborn, it just came out, cried out loud, dad took a picture off it and it died.. oh.. and it's big brother will be born within a few months.. G71 will be a better investment if you actually plan on running Unreal 3 it seems..

    nVidia promised a new shipment of cards a week after it's launch in november.
     
    #419 neliz, Dec 28, 2005
    Last edited by a moderator: Dec 28, 2005
  20. ninelven

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    And why would the burden of proof fall upon the more likely, more logical answer? Or why would the less likely scenario not require any proof and be accepted as fact? Maybe it is the same logic which holds that G71 being a smaller core on the same proccess as R580 must be clocked significantly lower.
     
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