Note: this item is free and unsupported and only works for certain Intel-based iMac models. There's also an MacBook/Pro Extended Fan Control version.

Download (includes source code)

Note: The UI is sized for 10.5 so, given that 10.4 Preference Panels are not as wide, there's some truncation of the right side of the graph (i.e., when running under OS X 10.4/Tiger).

Although ugly and not intended (as stated in the notes, 10.4 wasn't tested), it's perfectly functional this way. If you're energetic and want to fix it, edit the NIB via Interface Builder, make the sliders shorter and move the graph to the left. Sorry, but I don't have any more time to spend on this.

Important: if uninstalling, you'll likely need to reset the SMC as per the instructions on this web page (bottom of the page).

Click on a graphic or a heading for a full-sized view.