The fan is probably not a "problem" per se. It's trying to save it's life. You are probably generating heat way more than your graphics or cpu likes and it's trying to cool itself down before it overheats.
First hit the "S" key and watch the stats in the upper left corner. Then use the UP arrow key and turn your sleep mode up so that your fps drops before you fry some components.
Everyone PLEASE realize that just because MA 2.6 ran well on your system doesn't mean that MA 3.0 will. The new version is going to take better hardware to run as there is allot more going on, and it's not even close to finished yet.
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