Most likely your CPU cooler is the jet engine in your system. Never ever use a stock CPU fan. If you take a decent CPU cooler like for example the Scythe Mugen, it'll not cost you more than 30 bucks and the rounds per minute of the fan will never go above 1000, which you can barely hear. Temps will also stay at max 50-55°celsius under load, which ensures a longer life foryour system.
Just got it in the mail today. That thing is huge! Hope it fits in the case!