Have a AMD FX-8120 processor sitting in a Gigabyte GA 990FMX-UD3 motherboard with 8 gb's of DDR3 1333Mhz RAM(2x4gb each). The stock heatsink fan lately has been spinning faster and slower-with the faster speeds really whiny and noisy. Any suggestions to fix? All latest drivers installed and everything is in a Antec 900 case with plenty of case fans for airflow. Thanks.