Spacious Chassis: 4U server case with 8 internal 3.5' HDD bays and 3 extra 5.25' device slots. Exceptional Cooling: Upgraded Edition with 5x Sudokoo SK120 PWM High-Airflow Fans for optimal airflow and heat protection. Sudokoo SK120 PWM Fans - 500~3000 RPM±10% Expandable Design: 7 PCI slots and E-ATX compatibility for flexible expansion options. LED Indicators: Front panel LEDs for power, HDD, and LAN status for quick monitoring. Enhanced Utility: Includes 2 USB 3.0 ports and a built-in front panel lock for added security.