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Thread: OCCT 3.1.0 shows HD4870/4890 design flaw - they can't handle the new GPU test !

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  1. #1
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    Apparently I'm a tad confused in all this, esp. with the "82A" hypothesis being bandied about.

    From what I've been able to gleen, Tetedeiench is saying, and please correct me if I'm wrong....PLEASE!....is that the 4870's that were being used in Crossfire in his original post by one of his testers using OCCT 3.1.0 and the gpu test was pulling 82A+ into each card? Apparently that's what is being said and displayed with the hardware monitoring software graphs presented on the first page...up to 86A per card, which comes out to, since the cards run on +12V DC, 1032W for the card pulling 86A and 980W for the card pulling just below 82A.

    And Tetedeiench also states, "....we had a 4870 PCS+ (Asus) overclocked that could pull 106A, flawlessly....", which turns into 1272W of load being processed by the VRM's, correct?

    So, what power supplies are being used that can supply 2kw of power, for the 4870's in Crossfire as first mentioned since the two were pulling a combined 168A, or for the 4870 PCS+ card that was pulling 106A? Just curious.....or am I missing something and this is system draw, but that's not what's being presented, at least from what I've been able to read. And I'm also wondering what gauge wiring you're using to sustain 86A of draw since typical 18ga wire won't support such amperages without beginning to melt its insulation.

  2. #2
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    Quote Originally Posted by Humminn55 View Post
    Apparently that's what is being said and displayed with the hardware monitoring software graphs presented on the first page...up to 86A per card, which comes out to, since the cards run on +12V DC, 1032W for the card pulling 86A and 980W for the card pulling just below 82A.
    its not 12v current that is measured but vgpu current

  3. #3
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    Quote Originally Posted by W1zzard View Post
    its not 12v current that is measured but vgpu current
    So what is vgpu current, then? It's expressed in amperage which can be converted to wattage since amperage x volts = wattage.

    So what is the voltage being used?

    Or, essentially, how is vgpu derived and what does it represent in draw?

    Please explain to an unknowing one so she may understand. Thx.
    Last edited by Humminn55; 05-20-2009 at 04:57 AM.

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