FWIW, I'm using this card:
01:00.0 VGA compatible controller: ATI Technologies Inc RV630 [Radeon HD 2600 Series]
Under Debian's 2.6.38-2-amd64, and the temperature is currently 74°C according to the "sensors" command, and the card is nearly too hot to touch. I've never tried the proprietary driver.
FWIW, I'm using this card:
01:00.0 VGA compatible controller: ATI Technologies Inc RV630 [Radeon HD 2600 Series]
Under Debian's 2.6.38-2-amd64, and the temperature is currently 74°C according to the "sensors" command, and the card is nearly too hot to touch. I've never tried the proprietary driver.