The Tornado 1000 comes with a 250watt power supply as its default supply. For power supply specifications click here . You ONLY need this cable if you use a Pentium 4. The 431watt power supply comes with this cable already included. Anyone selling a case with a top fan never tested for airflow.
Top fans disrupt airflow and increase temperatures.
Figure it sounds like a room air conditioner. It's noisy at first and then blends into the room and you don't even notice it. Depending on which case, between 28lbs and 32lbs.