FWIW: I have a FX8320 and initially my idle temp would be in the 45 Celsius range. I bought several different heatsink/fans and then decided that it was too much work to replace the stock cooler. I removed the heatsink/fan...clean it patiently, put new thermal grease on...idle temps dropped to 35-38 Celsius range.
As stated the noise was the biggest irritant, system never blinked, even when temps reached 70s when rendering some video files.
I would just remove the paste applied with the stock...clean everything...apply new grease and see if it improves.
Interesting, Varying Opinions
Edited by hamluis, 23 February 2017 - 04:03 AM.