New Imac user since November of 2008---2.66 Ghz , 4 GB memory, 20 inch with a 320mb and a 500mb Time Capsule. Currently have a number of portable phones that causes problems (disconnects the Time Capsule) when I have the Airport card set to 2.4ghz---Tried 4 or 5 different addresses but no effect. Changed to 5 ghz seems no interference from the portable phones but I noticed thru Istat that the temperature of the Airport Card goes up over 60c(seen it as high as 64c) from general 55c or 56c. I know that this is normal but I am looking for some kind of general explanation why the temperature difference.