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Thread: Can someone ID those chips on NVIDIA GTX580 board?

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    Default Can someone ID those chips on NVIDIA GTX580 board?

    The reference board "P1261" of GTX580 is roughly the same board as GTX480, without some of the output filtering caps and the cut-out under the impeller.

    In order to cap the board power NVIDIA has added THREE tiny SO-8 chips and some additional components to the board. In NVIDIA's slideshow those chips are claimed to be monitoring the real-time +12V voltage and input current at PCI-e slot, 6-pin and 8-pin connector respectively. When the board detects that the load power exceeds a certain limit (for a period of several seconds I guess), the board is throttled to keep the power under the cap, so any figures acquired under stress programs (aka "power viruses") such as Furmark or OCCT-GPU don't reflect the real power consumption. We've had similar experience before, on HD5970 reference board where such kind of power cap mechanism is integrated into the Volterra voltage regulator chips.

    If you look real close, you can see they carry the marking "A219". This picture shows that three shunt resistors (2, 5 and 5 mOhms respectively) are paired with those chips for current detection. Can someone identify those chips?
    Last edited by Jon Gerow; 11-09-2010 at 05:30 PM.
    It's been a hard day's night and I've been working like a dog.

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    Default

    Try Texas Instruments
    http://focus.ti.com/docs/prod/folder...icingpackaging
    Voltage/Current sensor with I2C interface.

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    I must say "JG's got talent".
    It's been a hard day's night and I've been working like a dog.

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    Default Disable GeForce GTX 580 Power Throttling using GPU-Z

    This is already a couple of days old, but I felt it might be of interest to someone here.

    Disable GeForce GTX 580 Power Throttling using GPU-Z

    P.S. Check out the comment thread - 111 comments in three days! This was obviously an eagerly awaited hack!
    Never trust a computer you can't throw out a window - Steve Wozniak.

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