does the fan on this thing ever not run? just plugges a new one in, and just browsing the web it's running at 24% fan speed (42 degrees C). It's not loud (I have the comp on the desk next to me with the cover off and it's hardly noticeable), but I'm just wondering if I should worry about the fan seemingly never turning off. Last video card was a GeForce 9500 GS, so I'm behind on the times. Also downloaded and installed latest drivers CCC 11.3. Thanks.