Wow 50c for idle can't be good, cuz on load it will fly to 80c and what not.
What are your load temps. Aren't these Phenom chips supposed to run cooler then Athlon X2 , Doesn't seem like your OCed either. That's a low voltage.
Its gotta be your HSF , make shure its installed properly and full contact with cpu and just ya make shure its seated correctly follow HSF installation guide. Try new thermal paste too. You should be @ 40c at least, without a OC with a 1.3ish voltage. gl,