Bruce, if you want your Thunderbird to run cooler, buy the recommended (Tom's Hardware Guide) Socket A CPU Fan - FOP32-1 and install with Arctic Thermal Silver paste, and you'll notice your processor will run cooler. I have a 1 GHZ Tbird installed in an ASUS A7V, that would hit over 50 degrees centigrade frequently, and as I speak now, the CPU is at 41(ASUSPROBE). You can pick the FOP32-1 up on the net for under 20. I got mine with the arctic thermal silver paste for 21.95. I think in the long run it will be a wise investment..Good Luck...