Profit of NV40 parts

Discussion in 'Graphics and Semiconductor Industry' started by Stryyder, May 6, 2004.

  1. Sxotty

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    Who is he talking about there? It seems to be none other than nvidia
    http://www.tomshardware.com/hardnews/20040507_060001.html
     
  2. AlphaWolf

    AlphaWolf Specious Misanthrope
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    Well I don't know that it does. Merely speculating. It was reported that gddr3 used half the power with up to double the frequency. I doubt it does both of those at the same time.
     
  3. BetrayerX

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    The die size is bigger than we thought and the power consumption is higher than we expected.
    For most people this was true.


    I am also surprised that they have not been able to reach a higher core frequency
    After seeing the 5800 and 5900 playing with the 500MHz mark, this was kind of expected.

    The only FUD-like comment was this:
    . We expected them to end up expanding internal processing instead.
    Since NV obviously improved shader performance I guess it's a given fact.
     
  4. CliffA

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    Power Connector

    I've seen the guts of plenty of power supplies, and I seriously doubt that the 6800U can tell the difference between two discrete 4-pin molex conectors, and two that have been daisy-chained together. My guess (and it's only a guess) is that the 6800 would probably not glitch if you connected both power connectors from a single power suppy lead.
     
  5. martrox

    martrox Old Fart
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    Cliff, welcome to B3d!
     
  6. mczak

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    I think you misunderstood Dave Orton there. This just means ATI expected Nvidia to have fewer more complex pixel pipelines (something like 8 uber-pipes with maybe 2 texturing units each, and lots of shader alus) instead of 16 "simple" pipes. That would have been more of a traditional evolution of nvidias design, NV40 is quite a radical change in design.
     
  7. Mintmaster

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    Where did you get these numbers?

    Most PSU's that I've used have either 20 gauge or 22 gauge, but lets go with 20 gauge. Here they say that 1.5 amps is the max for 20 gauge wire, although they use a conservative 700 circular mils per amp rule. In fact, your numbers match the "Maximum amps for chassis wiring" values on that chart, which the page says is for wiring in air.

    Generally, the lowest rule I've seen is 300 circular mils per amp, most places saying 500 is the minimum (although one guy on a forum said 200 is an absolute minimum). 300 gives a 20 gauge max current of 3.5 amps.

    In other words, most electricians suggest keeping current below 3.5 amps in a 20 gauge wire.

    We see here that the 12V line can have 5 amps running through it. When games become more intense on the GPU with more dual-issued pixel shaders you could see an even higher current draw.

    The second connector is not as "optional" as NVidia is saying, and you better use two different wires as opposed to what HardOCP did if you want to be safe. Hardcore gamers can play for hours at a time.
     
  8. Sxotty

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    I was simply responging to someone that stated ATI did not discuss their competitor and since NV did they were evil.
     
  9. digitalwanderer

    digitalwanderer Dangerously Mirthful
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    No, no....nVidia is evil for entirely different reasons. ;)
     
  10. CliffA

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    6800 Power supply woes

    Although there are a lot of recommendations for the max current that a wire can safely handle, most power supplies I have seen even back to the AT era has been at least 20ga, and most of the 300W plus models out there are equipped with 18ga wire. If they aren't you should probably be looking for a new p/s anyways. Recommendations are just that, and experience has shown that 18ga wire can take a lot of juice. I've seen plenty of Peltier setups that drew more than 70 watts off the 12 volt line without issue.

    This is going to turn out to be a distinction between cheap power supplies and good ones, regardless of the output per rail specifications that are often quoted. I did a test yesterday with my Antec 480W power supply (a very nice one I might add, I reviewed it on my site) and found that with a multimeter, you can get continuity between hot leads from separate power supply output cables (turn p/s off first please). In other words, the hots all meet up inside the power supply. No big reveleation here, it has been known for some time. So the question only remains whether a single power supply lead can deliver the juice without making a significant voltage drop occur.

    As long as the power supply can deliver the juice, and the wiring is done to decent tolerances, I don't see a problem with daisy chaining two connectors together at the power levels we are discussing here.

    Now, I don't actually have a card to test. I'm not rich :) My somewhat educated guess is that the power distribution channels within the card itself are "expecting" that both sockets are receiving 12 volts. The card can't possibly know wheter you have daisy chained the cables together, and as long as it is getting a steady stream of electrons from the power supply, everything *should* be O.K.
     
  11. Optimummind

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    What a dum-dum. :D
     
  12. Optimummind

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    You didn't, by any chance, come from the Driverheaven or Rage3D did you? :lol:
     
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