Asus Prime X399-A - Chapter 1: Product Introduction; Motherboard Overview; Chapter 2: Basic Installation; Chapter 3: BIOS Setup

iii
Contents
Safety information ....................................................................................................... v
About this guide ......................................................................................................... vi
PRIME X399-A specications summary ................................................................. viii
Package contents ...................................................................................................... xii
Installation tools and components ......................................................................... xiii
Chapter 1: Product Introduction
1.1 Motherboard overview ............................................................................... 1-1
1.1.1 Before you proceed ..................................................................... 1-1
1.1.2 Motherboard layout ..................................................................... 1-2
1.1.3 Central Processing Unit (CPU) ................................................... 1-4
1.1.4 System memory .......................................................................... 1-5
1.1.5 Expansion slots ........................................................................... 1-7
1.1.6 Jumpers, buttons and holes ........................................................ 1-9
1.1.7 Onboard LEDs .......................................................................... 1-11
1.1.8 Internal connectors....................................................................1-17
Chapter 2: Basic Installation
2.1 Building your PC system...........................................................................2-1
2.1.1 CPU installation...........................................................................2-1
2.1.2 CPU heatsink and fan assembly installation ............................... 2-3
2.1.3 Motherboard installation .............................................................. 2-4
2.1.4 DIMM installation......................................................................... 2-6
2.1.5 ATX power connection ................................................................ 2-7
2.1.6 SATA device connection ............................................................. 2-8
2.1.7 Front I/O connector ..................................................................... 2-9
2.1.8 Expansion card installation ....................................................... 2-10
2.1.9 M.2 installation .......................................................................... 2-11
2.2 BIOS update utility ................................................................................... 2-12
2.3 Motherboard rear and audio connections ............................................. 2-13
2.3.1 Rear I/O connection .................................................................. 2-13
2.3.2 Audio I/O connections ............................................................... 2-15
2.4 Starting up for the rst time .................................................................... 2-17
2.5 Turning off the computer ........................................................................ 2-17
Chapter 3: BIOS Setup
3.1 Knowing BIOS ............................................................................................ 3-1
3.2 BIOS setup program .................................................................................. 3-2
3.2.1 EZ Mode......................................................................................3-3
3.2.2 Advanced Mode .......................................................................... 3-4
3.2.3 QFan Control...............................................................................3-7
3.2.4 EZ Tuning Wizard ....................................................................... 3-8