All fans are full blast. the 4870's fan is louder than all other fans combined. At some point when I over clock the system i'll post a load temp pic. That Power Now will help save pennies in the long run. Too bad my 4870 doesn't down clock more automatically might have to set up profiles to run it at absolute slow when i'm not gaming. btw ambient temp is probably aroudn 18-20 degrees Celsius. when all fans are off idle temp for cpu case hovers around 28 degrees and system temp hovers around 34 degrees.