Asus Pro WS 621-64L SAGE Series Manual page 40

12. USB 2.0 connector
The USB 2.0 connector allows you to connect a USB module for additional USB
2.0 ports. The USB 2.0 connector provides data transfer speeds of up to 480 MB/s
connection speed.
DO NOT connect a 1394 cable to the USB connectors. Doing so will damage the
motherboard!
The USB 2.0 module is purchased separately.
13. Power Supply SMBus connector
The Power Supply SMBus connector allows you to connect the SMBus (System
Management Bus) to the PSU (power supply unit) to read the PSU information.
Devices communicate with an SMBus host and/or other SMBus devices using the
SMBus interface.
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Chapter 1: Product Introduction