Asus STRIX X99 - System Agent Configuration; USB Configuration

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Chapter 3: BIOS Setup
Chapter 3
3.6.4 System Agent Configuration
NB PCI-E Configuration
The items in this menu allow you to select the operating speed of the PCIEX16_1 slots.
3.6.5 USB Configuration
The items in this menu allow you to change the USB-related features.
The Mass Storage Devices item shows the auto-detected values. If no USB device is
detected, the item shows None.