You do not need any of these software coolers if you have ACPI enabled in the BIOS (which you should). CPU idling is already built in with your motherboard and Athlon/T-bird combo. Rain, CPUidle, Wincooler, etc., can also sometimes have a reverse effect with your particular system. Trust me, I learned the hard way. They do not work properly with the Athlons, and unless you can find one that is specifically designed to work with your T-bird, they can do more harm than good.