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Old 10-08-06, 06:12 AM   #2
Join Date: Jul 2002
Location: Netherlands, Europe
Posts: 2,105
Default Re: nVidia GF7600GS temperature sensor via iC?

All NV4x/G7x GPUs contain a sensor build into the GPU. The sensor and the temperature reading mechanism are inside the GPU. It isn't connected to the i2c-bus. On highend 7800GTX/7900GTX cards and perhaps on some other boards you can find an external sensor chip aswell. This chip is then connected to the i2c-bus.

The nvidia drivers export the temperature using the NV-CONTROL extensions and further there's NVClock which can directly read the temperature from the card. (use nvclock from cvs; the code is a little buggy, I need to add a correct offset for the 7600gs but for the rest it works well)

In the near future nvclock will feature a dbus daemon for hw monitoring purposes, so that external apps can easily read out the temperature, fanspeeds and other parameters.
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