A Detailed Look
The Seasonic X Series 400W Fanless power supply features a scratch resistant black matte finish with a gold accent printing. The enclosure is 160mm (6.3”) deep so it should fit in most cases. The top, bottom and all four sides incorporate openings for airflow. This is important because without a fan to generate airflow the PSU must rely on passive, convection cooling to dissipate heat.
Seasonic provides several notes to help educate the end user how important proper ventilation is to the reliable operation the X-400 fanless PSU. Just because it does not have a fan does not mean that it doesn’t need adequate airflow to dissipate heat. Ideally, existing case fans should generate a flow of air around and/or through the PSU for cooling. If you plan to install the X-400 fanless PSU in a case that doesn’t have any case fans then it will need to have plenty of open area around the PSU with an opening above to let the hot air out. Convection cooling relies on being able to draw cool air in through the bottom and all four sides with an unrestricted path for hot air to flow out the top.
The Seasonic X Series 400W Fanless power supply is fully modular and comes with a good assortment of cables/connectors. All of the cables are covered with a black, braided plastic mesh sleeving and measure at least 20″ to 26” long.
• (1) Main power connector (24-pin/20-pin)
• (1) ATX12V/EPS12V (4+4-pin)
• (1) PCI Express (6+2-pin)
• (5) Peripheral Optical/HDD (4-pin)
• (5) Peripheral Serial ATA (15-pin)
• (2) Peripheral FDD (4-pin) Y-adapter cable
