You can check your CPU temperature by downloading a third-party app, like HWMonitor for PCs and XRG for Macs.
Like most computers, your iMac contains multiple internal sensors that can tell you the temperature of your CPU, your graphics card's processing unit (GPU) and your memory controller. While this data ...
PowerBook fans and temperature Continuing coverage of more sensitive (turning on at a lower CPU temperature) fans under Mac OS X 10.3.2: More sensitive fans means cooler surface temperatures While ...