Pre-connected system cables
1. 8-pin BPPWR1 power connector (from power supply to backplane)
2. Auxiliary panel connector (from motherboard to front I/O board)
3. Panel connector (from motherboard to front I/O board)
4. System fan connectors (from motherboard FAN1-8 to system fans)
5. USB connectors (from motherboard to front I/O board)
6. SATA connector (from motherboard to SATA/SAS backplane board to connect ODD)
7. ISATA connector (from motherboard to SATA/SAS backplane board to connect HDD
1 - HDD 4)