The rear end of the Signature 850w has a power toggle switch, AC power cable and a cooling fan. The fan is an 80mm Nidec Beta SL (PWM, speed regulated), and it pulls air through the power supply out the back. The grill design allows for a good balance of airflow and fan protection (from stray fingers, cats and other objects).

The front of the power supply is mainly composed of ventilation grills. There are also modular connectors on the front, with the red connectors for additional PCI-E power cables and the black connectors for peripheral power cables (SATA and 4-pin molex).

The sides, bottom and top of the Signature are pretty plain. On one of the sides has a sticker with the Signature 850's DC power output specifications.

The bottom has an Antec badge.