I'm about ready to upgrade an older Socket 939-based PC. I have an AMD 64 3400 that is running a little hot (on full load it hits around 73 degrees), and I want to switch it out for an AMD X2 Dual Core. Nothing fancy, just something faster and hopefully cooler than my 3400. If I switch the processors, do I have to wipe the hard drives, or is it basically plug-n-play (aside from any changes to the BIOS, jumpers, etc)?