I have built a fairly nice PC w/ an AMD 9550 Phenom cpu. But I'm not sure whether or not I'm actually using all four cores. I've installed the software that AMD has made downloadable for dual core processors and I think that it's working. How can I tell if I'm getting all the processing that I paid for? I have 4 gigs of 800 mHz ram (DDR2) and a Gigabyte MB that won't handle more than 800 mHz ram, SATA HDs, large PS, really big Thermal Take cpu cooler. Any suggestions? Oh, yes. I'm running Win XP SP-3.