"The Seasonic M12 Modular 700W Power Supply performs very well, has a quiet 120mm fan, and another fan if it's required. This is a modular power supply. However, the main motherboard 20/24, 8pin, and 4pin leads are hardwired into the power supply and are not modular. Modular power supplies give you the freedom of selecting only the leads you require, therefore freeing up a lot of cable mess inside the case, thus increasing airflow. Watch the Video to find out more..." ~3dGameMan.com