I don't want to stress much about this, but I had the same issues as you with torrent and amule and now I'm 3 days stable 24/7. I founded that the APIC setting in BIOS was the matter. Plus I set the IRQ not being assigned automatically. I think this is a problem related to 2 core AMDs. Nobody told me to do this, but after month of trying everything possible this was what kept me from buyng another system. I also used the idlehalt=0 fn=3 parameter.