The Seasonic S12D is a standard black unit with its output table and label on the outward-facing side. The rear is honeycombed for airflow and features a rocker power switch. The bottom has a 120 mm San Ace Sanyo Denki fan said to be among the most silent available.
I’m not entirely impressed with the design of the cable egress hole. The cables are bound together with a cable tie and another one closer to the hole. The cables are sheathed, though.
In addition to the standard 20+4 pin motherboard connector, there are six 4-pin device connectors, nine SATA connectors, one floppy connector, two 6-pin PCI-E connectors, two 6+2-pin PCI-E connectors, and the real kicker: dual CPU connectors for high-end server boards. That’s right, a 4+4-pin connector and an 8-pin connector suitable for motherboard and processor combinations which are more thirsty for juice than the standard board.