well the best test for an AMD cpu is called Toast!
its findable on google, but a bit hard, and i dont have a link.
any other program should work well too
the idea is to heat up your CPU and heatsink to their max, while watching the temperatures and voltages on motherboard monitor.
if your cpu is having heat trouble, it should freeze at a ceartain temp each time.
i.e. with my particular CPU and mobo my critical temp is a rather low 52C (according to motehrboard monitor) anything above that locks up in a very short space of time.
not this is CPU temp, has little to do with room temp.
Anything i think of as 'Decent' is unlikely to ever become 'OEM'