Do I need a external fan?

So I have got a PC build, and I was wondering for AMD FX-6300 3.5GHz 6-Core Processor do I need a after market fan? or can I stay with the in stock fan? and the fan I am looking at for a external after market fan is a Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler