If A. What kind of noise is it? Is it the whirring of the fan? If so, you may need to turn down the RPM is BIOS, or through a thirdparty App like Speedfan.
If it is a rattling, etc. See if you have it mounted correctly as suggested by Matt.
If B. Are you sure you have the right size fan...with the same power connections?
Hahaha I hope you were joking also. Make sure before you use BIOS to turn the fan speed down you know what everything in BIOS actually means. Don't end up doing something stupid. Check with someone before you change something in BIOS. Or what ATK Spade said. Just use an app to do it.