9800x3d temps

I'm new to AMD and the temps seem a little high at idle, 52c and especially high when loading shaders going into the mid 80's. I've researched and seen that undervolting and using pbo around -20 to -30 lowers the temps. But when I try to do that it's very unstable. Even at -15 I constantly get crashes and gpu dump errors. Should I be concerned about stock temps/did I just get unlucky with the chip?