Supermicro SC813 1U Chassis is optimized for high-end server applications. At a depth of 25.6", this chassis can house extended ATX boards and support a maximum of 2 addon cards (1x Full-height/Full-length and 1x Low-Profile) in certain models.1. 500W Cold-swap Power Supply with I2C For Remote Management2. 4 x 3.5" Hot-swap SAS/SATA Drive Bays3. 1 x Slim CDROM Drive 1 x Slim Floppy Drive4. 4x 10,200 RPM Counter-rotating Fans5. 1 x Full-height / Half-length I/O Expansion Slot6. 1 x Low-profile I/O Expansion Slot7. 1 x Optional 1U IPMI and 3rd LAN Support8. Power Switch, Reset Switch & 5 LED Indicators