Sapphire HD 7970 Dual X Review @ OCC
 

The Dual X cooler is really the bonus to this particular card; it is the real feature that sets it apart from not only other 7970s but also other high-end cards. Under full load it shows off its true colors as one of the best cooled cards on the market while remaining quiet (in a relative manner). With the fans at full it can dissipate quite a bit of heat away from the card to keep it cool and ready for more. It might dump a little more heat to the case at idle and run slightly "hotter" at idle, but it is much better than a constant vacuum cleaner noise coming from your case.

http://www.overclockersclub.com/revi...phire_hd_7970/