AMD's a long time ago did run somewhat hot. Now AMD's run cool with the exception of the opteron processors which are meant for server environments, plus two cores make em run a bit hotter.
If you were to get a venice or san diego single cored AMD CPU it will not get hot and burn up, muchless burn up everything in your mobo. They have emergency shut off temps and whatnot.
Stock heatsink should be fine, just watch the temps, especially if you live in a tropical climate where it's generally warm. So an aftermarket heatsink would probably be worth it, but not 100% needed more than likely.