Hey,
Here are some tips:
Download a program like MSI Afterburner, and create something called a custom fan profile. Make sure your temperatures are in a safe range before attempting this. By creating a custom fan profile you can choose how the fan reacts to specific temperatures. What you would be doing is lowering the fan speed gradually, starting out high (to make sure you don't damage your card), and then you test the fan speed and temperatures with a game or benchmark. Keep a close eye on your temperatures. If they are fine, then lower the fan speed in the fan profile and repeat the process.
Open your case, and make sure your cable management is good. Also clean out any dust from your case, and the graphic card.
Hope this helps!