If you check with the AMD web-site you will find they do not recommend a "Normal" temp. for their CPU's, but say, "We expect our XP range of CPU's to operate in the area of 60-65c, with a Max. temp. of 95c.
My XP1800 runs between 50-54c, this Is fine with me, (Only two fans), and very quiet. If your XP 3000 is running in the mid fifties in the weather we are having at the moment, then you have nothing to worry about. j.