The design of the unit is very smart. While most drive bay coolers uses small 1.5" fans on the drive bay face, the TT-900 uses 2 big 92mm fans on 2 levels. The fans are very quiet. They only produce 27 decibels of noise when operating at 2100 RPM. This is quieter than most case fans. You won't be wasting any power supply connectors by using this product because a 4 pin pass through connector powers the fans.