資料來源：Seasonic M12

Another unique feature that sets the M12 series apart is the extra 6cm ball bearing fan which provides additional cooling and reduction of internal hot spots in the power supply. Like the main 12cm ball bearing fan, the 6cm fan is mounted on soft rubber grommets and is governed by Seasonic’s high performance Super Silent Fan Control [S2FC]. This special feature makes the Seasonic M12 series one of the most silent and well-cooled power supplies available on the market today.



另外可參考國外網站的測試數據！
http://www.silentpcreview.com/article676-page5.html
在負載超過40~50%以上時，前風扇才會啟動，但噪音值會較吵！
風扇這樣子設計是一種比較平衡的做法！