I recently upgraded the power supply of my AthlonXP-based system to an Antec TruePower 430W. The new PSU is great and runs quietly, but now I'm eager to quiet down the rest of my system. The first place to start will be my CPU. I'm running an Athlon XP 1600+, using the retail heatsink and fan, on an Epox 8K7A+ motherboard. I'm not overclocking (nor do I plan to). I know very little about using aftermarket heatsinks and fans, so I need some direction as to what I need to buy. Now, as I understand it, replacing a stock fan on an Athlon involves replacing the heatsink as well (since most aftermarket fans are 80 mm? Correct me if I'm wrong). I've heard good things about the Panaflo L1A fan. It looks like I need to purchase the power connection (tail?) for the fan separately. Will this plug into my motherboard like my existing fan? As for a heatsink, I'm up for suggestions. I know that Arctic Silver is the thermal grease of choice. Is it hard to apply? Any tips/suggestions for a first timer?