Asus PRIME X399-A User Guide - Page 53
Motherboard rear and audio connections, 2.3.1 Rear I/O connection
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Chapter 2 2.3 Motherboard rear and audio connections 2.3.1 Rear I/O connection 1 2 3 4 5 6 7 89 Rear panel connectors 1. USB BIOS Flashback button 6. 2. USB 3.1 Gen 1 ports 5, 6, 7, and 8. 7. 3. LAN (RJ-45) port* 8. 4. USB 3.1 Gen 1 ports 1, 2 (bottom 9. port supports USB BIOS Flashback) 5. USB 3.1 Gen 2 Type-A port EA2 USB 3.1 Gen 1 ports 3, 4 USB 3.1 Gen 2 Type-C™ port EC1 Optical S/PDIF Out port Audio jacks** * and ** : Refer to the tables on the next page for LAN port LEDs and audio port definitions. • USB 3.1 Gen 1 / Gen 2 devices can only be used as data storage only. • We strongly recommend that you connect your devices to ports with matching data transfer rate. Please connect your USB 3.1 Gen 1 devices to USB 3.1 Gen 1 ports and your USB 3.1 Gen 2 devices to USB 3.1 Gen 2 ports for faster and better performance for your devices. ASUS PRIME X399-A 2-13