Heatsink fans

Hello, I purchased a HP Pavilion P7-1439 Desktop l AMD A10-5700 3.40GHz. I want to add a heatsink fan to it, to prevent it from getting hot. Was the problem with my other PC. What do I need to know as to what kind of heatsink fan is compatable with it? Not sure if this helps but here is my pc's spec page. Please and thank you. I see so many heatsinks fopr sale and dont want to deal with an incompatability issue.

http://h20566.www2.hp.com/portal/sit...tte.cachetoken