Propnut,
I think you're running too hot. It's true that Athlon's can take heat up into the 60's, but that doesn't make it a good idea. What heatsink? You have three casefans and you're running ~50C...yikes! How is your blow/suck setup on your fans? It's best to have the one in front suck air in, and the higher one by the CPU blow air out. Is the third on the PS or is it separate...like over the motherboard etc...