1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your ASUS X99-A motherboard. The ASUS X99-A is designed to support Intel Core i7 processors on the LGA 2011-v3 socket, featuring DDR4 memory support and the Intel X99 Express chipset. Please read this manual thoroughly before proceeding with installation or operation.
2. Setup and Installation
Proper installation is crucial for the stable operation of your system. Follow these steps carefully.
2.1 Motherboard Layout
Familiarize yourself with the various components and connectors on the motherboard.

Figure 1: Top-down view of the ASUS X99-A motherboard, showing the CPU socket, RAM slots, PCIe slots, and various connectors.

Figure 2: Angled view of the ASUS X99-A motherboard, highlighting the I/O panel, CPU socket, and memory slots.
2.2 CPU Installation (LGA 2011-v3)
- Prepare the Socket: Gently open the CPU socket retention mechanism.
- Align the CPU: Carefully align the Intel Core i7 processor with the LGA 2011-v3 socket, ensuring the triangular markers on the CPU and socket match.
- Insert the CPU: Lower the CPU straight into the socket without applying force.
- Secure the CPU: Close the socket retention mechanism until it locks into place.
- Apply Thermal Paste: Apply a thin, even layer of thermal paste to the top of the CPU.
- Install CPU Cooler: Mount your compatible CPU cooler according to its manufacturer's instructions.
2.3 Memory (RAM) Installation
The ASUS X99-A supports DDR4 memory in a quad-channel configuration.
- Open DIMM Clips: Open the retention clips on both ends of the DDR4 DIMM slots.
- Align Memory Module: Align the memory module with the DIMM slot, ensuring the notch on the module matches the key in the slot.
- Insert Memory: Press down firmly on both ends of the memory module until the clips snap into place.
- Install Additional Modules: For optimal performance, install memory modules in the recommended quad-channel configuration (refer to the motherboard's printed manual for specific slot order).
2.4 Storage Device Installation
The motherboard supports SATA Express and PCI Express 3.0 x4 M.2 storage devices.
- SATA Devices: Connect SATA data cables from your SSDs/HDDs to the SATA ports on the motherboard. Connect power cables from your power supply to the devices.
- M.2 SSD: Locate the M.2 slot. Insert the M.2 SSD at an angle and then gently push it down, securing it with the provided screw. Note that installing an M.2 SSD may disable certain PCIe slots or SATA ports; consult the full manual for details.
2.5 Graphics Card and Expansion Cards
Install your graphics card into the primary PCI Express x16 slot. Ensure it is fully seated and secured with the case latch or screw. Connect any necessary PCIe power cables from your power supply to the graphics card. Other expansion cards can be installed in available PCIe slots.
2.6 Power Connections
Connect the 24-pin ATX power connector and the 8-pin (or 4+4-pin) CPU power connector from your power supply to the corresponding ports on the motherboard.
2.7 Case Installation and Front Panel Connections
Mount the motherboard into your PC case using the appropriate standoffs and screws. Connect the front panel headers (power button, reset button, USB ports, audio jacks, LED indicators) to the corresponding pins on the motherboard. Refer to your case and motherboard manuals for exact pin layouts.
3. Operating Your System
3.1 Initial Boot and BIOS/UEFI Setup
Upon the first boot, the system will typically enter the BIOS/UEFI interface. Here you can configure boot order, system time, and other hardware settings. Press the DEL or F2 key during startup to access the BIOS/UEFI.
3.2 Driver Installation
After installing your operating system, install the necessary drivers for the motherboard's components (chipset, audio, LAN, USB, etc.). These can typically be found on the ASUS support website for your specific motherboard model.
3.3 ASUS Software Utilities
ASUS provides various software utilities, such as AI Suite 3 with 5-Way Optimization, to enhance system performance and manage settings directly from your operating system. These tools can assist with overclocking, fan control, and power management.
4. Maintenance
Regular maintenance helps ensure the longevity and optimal performance of your motherboard.
- Dust Removal: Periodically clean dust from the motherboard and components using compressed air. Ensure the system is powered off and unplugged before cleaning.
- BIOS Updates: Check the ASUS support website for BIOS updates. BIOS updates can improve compatibility, stability, and performance. Follow ASUS's instructions carefully when updating the BIOS.
- Driver Updates: Keep your system drivers updated to ensure compatibility and optimal performance with new software and hardware.
5. Troubleshooting
This section addresses common issues you might encounter.
- No Display Output:
- Ensure the graphics card is properly seated and connected to power.
- Verify the monitor cable is securely connected to the graphics card and monitor.
- If using multiple display outputs on the graphics card, try a different port.
- System Fails to Boot:
- Check all power connections to the motherboard and components.
- Reseat RAM modules and ensure they are in the correct slots for your configuration.
- Verify the CPU is correctly installed and the cooler is properly mounted.
- Consult the motherboard's Q-Code LED display (if available) for diagnostic codes. These codes can indicate specific hardware issues.
- System Instability or Random Shutdowns:
- Ensure adequate cooling for the CPU and other components.
- Check for loose power or data cables.
- If overclocking, revert to default settings to rule out instability caused by aggressive configurations.
- For Windows users experiencing "Kernel Power event 41" errors, disable "Turn on Fast Startup" in Windows Power Options > System Settings.
- Driver Issues:
- Download the latest drivers directly from the ASUS support website.
- Uninstall existing drivers before installing new ones if issues persist.
6. Specifications
| Feature | Detail |
|---|---|
| Brand | ASUS |
| Model Name | X99-A |
| CPU Socket | LGA 2011-3 |
| Compatible Processors | Intel Core i7 |
| Chipset Type | Intel X99 |
| RAM Memory Technology | DDR4 |
| Memory Speed | 2133 MHz (Supports up to 3200(OC) MHz) |
| Max Memory Capacity | 64GB (8x DIMM Slots, Quad Channel) |
| Audio | Realtek ALC1150 8-Channel High Definition Audio CODEC |
| LAN | Intel I218V Gigabit Ethernet Controller |
| Storage Interfaces | PCI Express 3.0 x4 M.2, SATA Express, SATA 6Gb/s |
| USB Ports | USB 2.0, USB 3.0 (specific counts vary by configuration) |
| Form Factor | ATX |
| Product Dimensions (LxWxH) | 10.4 x 2.7 x 12.9 inches |
| Item Weight | 2.05 pounds |
7. Warranty and Support
ASUS provides a limited warranty for its products. For specific warranty terms and conditions, please refer to the documentation included with your product or visit the official ASUS support website. A 30-day refund policy is typically available if the motherboard is not user-damaged.
For technical assistance, driver downloads, and BIOS updates, please visit the official ASUS support website: www.asus.com/support





