Page 2
Product warranty or service will not be extended if: (1) the product is repaired, modified or altered, unless such repair, modification of alteration is authorized in writing by ASUS; or (2) the serial number of the product is defaced or missing.
Safety information Electrical safety • To prevent electrical shock hazard, disconnect the power cable from the electrical outlet before relocating the system. • When adding or removing devices to or from the system, ensure that the power cables for the devices are unplugged before the signal cables are connected. If possible, disconnect all power cables from the existing system before you add a device.
Page 5
Button/Coin Batteries Safety Information Remove and immediately recycle or dispose of used batteries according to local regulations and keep out of reach of children. Do not incinerate or dispose of batteries in household trash. If ingested or inserted inside any part of the body, call a local poison control center for treatment information.
Refer to the following sources for additional information and for product and software updates. ASUS website The ASUS website (www.asus.com) provides updated information on ASUS hardware and software products. Optional documentation Your product package may include optional documentation, such as warranty flyers, that may have been added by your dealer.
RAID Configuration Guide Please visit https://www.asus.com/support for more information on the RAID Configuration Guide. Conventions used in this guide To ensure that you perform certain tasks properly, take note of the following notes used throughout this user guide. Information to prevent damage to the components and injuries to yourself CAUTION when trying to complete a task.
1 x PRIME B860M-A WIFI motherboard Motherboard 1 x PRIME B860M-A motherboard Cables 2 x SATA 6Gb/s cables 1 x ASUS WiFi Q-Antenna (only for <PRIME B860M-A WIFI>) Miscellaneous 1 x M.2 rubber package 1 x Screw package for M.2 SSD...
® ® Supports Intel Turbo Boost Technology 2.0 and Intel Turbo Boost Max Technology 3.0** * Refer to https://www.asus.com/support/download-center/ for CPU support list. ** Intel ® Turbo Boost Max Technology 3.0 support depends on the CPU types. ® Intel B860 Chipset Chipset 4 x DIMM slots, Max.
Page 10
PRIME B860M-A Series specifications summary Wi-Fi 6E (only for PRIME B860M-A WIFI) 2x2 Wi-Fi 6E (802.11ax) Supports 2.4/5/6GHz frequency band* Wireless & Bluetooth ® Bluetooth ® v5.3* * WiFi 6E 6GHz regulatory may vary between countries, supported only in Windows 11 or later.
Page 11
PRIME B860M-A Series specifications summary Storage Related 2 x M.2 slots (Key M) 4 x SATA 6Gb/s ports ® 1 x USB 10Gbps connector (supports USB Type-C 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 1 x USB 2.0 header supports 2 additional USB 2.0 ports...
Page 12
Operating System Windows 10 64-bit (21H2 & later) micro-ATX Form Factor Form Factor 9.6 inch x 9.6 inch (24.4 cm x 24.4 cm) NOTE: Specifications are subject to change without notice. Please refer to the ASUS website for the latest specifications.
Chapter 1: Product Introduction Product Introduction Before you proceed Take note of the following precautions before you install motherboard components or change any motherboard settings. CAUTION! • Unplug the power cord from the wall socket before touching any component. • Before handling components, use a grounded wrist strap or touch a safely grounded object or a metal object, such as the power supply case, to avoid damaging them due to static electricity.
3. Expansion slots This motherboard supports one PCIe x16 graphics card, one PCIe x16 (supporting x4 mode) and one PCIe x1 network cards, SCSI cards and other cards that comply with the PCI Express specification. 4. Fan and Pump headers FAN PWR The Fan and Pump headers allow you to connect fans or pumps to FAN IN...
Page 16
6. M.2 slots (Key M) The M.2 slots allow you to install M.2 devices such as M.2 SSD modules. NOTE: • Intel ® Core™ Ultra Processors (Series 2) M.2_1 slot (Key M), type 2242/2260/2280 (supports PCIe 5.0 x4 mode) • Intel ®...
NOTE: • The Addressable Gen 2 header supports addressable RGB LED strips (5V/Data/Ground), with a maximum power rating of 3A (5V). Additionally, the addressable header on this board can support up to 120 LEDs per header in Gen1 mode, or a combined maximum of 500 LEDs in Gen 2 mode.
Page 18
Plug the power cord and turn ON the computer. Hold down the <Del> key during the boot process and enter BIOS setup to re- enter data. CAUTION! DO NOT short-circuit the pins except when clearing the RTC RAM. Short-circuiting or placing a jumper cap will cause system boot failure! 15.
Page 19
• Power Button/Soft-off Button header (PWR_BTN) The 3-1 pin header allows you to connect the system power button. Press the power button to power up the system, or put the system into sleep or soft-off mode (depending on the operating system settings). •...
1.2.2 Rear panel connectors Rear panel connectors DisplayPorts USB 10Gbps (Teal blue) Type-A port 3 USB 2.0 ports E1, E2, E3 and E4 Realtek 2.5Gb Ethernet port* HDMI™ port ® USB 20Gbps Type-C port C15 USB 5Gbps Type-A port 1 and 2 Wi-Fi module (only for PRIME B860M-A WIFI) Audio jacks** * and **: Refer to the tables under LAN port LEDs, and Audio I/O connections sections.
1.2.3 LAN port LEDs Realtek 2.5Gb Ethernet port LED indications ACT/LINK SPEED Activity Link LED Speed LED Status Description Status Description No link No link 2.5 Gbps connection GREEN GREEN Linked LAN port 1 Gbps / 100 Mbps / BLINKING Data activity ORANGE 10 Mbps connection...
IMPORTANT! Install a heatsink or AIO cooler after installing the CPU. Please refer to the Motherboard Installation Guide on the ASUS support site, or to the user manual of the heatsink/ AIO cooler for steps on installing the heatsink/AIO cooler.
Page 23
IMPORTANT! Ensure the notches on the CPU are properly aligned to the tabs in the CPU socket, and the triangle mark on the CPU is aligned to the same corner as the triangle mark on the socket. 1-11 Motherboard User Manual...
(D/C) from the same vendor. Check with the vendor to get the correct memory modules. • Visit the ASUS website for the latest QVL. 1-12 Chapter 1: Product Introduction...
Page 25
Installing a DIMM Removing a DIMM 1-13 Motherboard User Manual...
M.2 module installation NOTE: • The illustrations only show the installation steps for selected M.2 slots, the steps are the same for the other M.2 slots. • Use a Phillips screwdriver when removing or installing the screws or screw stands mentioned in this section.
Page 27
Install your M.2 module to the M.2 slot. IMPORTANT! Ensure that there is nothing obstructing your M.2 module when installing the M.2 module to the M.2 slot. Remove the plastic film from the thermal pads on the bottom of the heatsink. NOTE: If the thermal pad on the M.2 heatsink becomes damaged, we recommend replacing it with a thermal pad with a thickness of 1.25mm.
Page 28
Installing an M.2 module to the M.2_2 slot Install the bundled screw stand to the M.2 length screw hole you wish to install your M.2 module to. Install your M.2 module to the M.2 slot. Secure your M.2 module using the bundled screw stand’s screw. 1-16 Chapter 1: Product Introduction...
ASUS WiFi Q-Antenna installation (on selected models) Installing the ASUS WiFi Q-Antenna Connect the bundled ASUS WiFi Q-Antenna connector to the Wi-Fi ports at the back of the chassis. IMPORTANT! • Ensure that the ASUS WiFi Q-Antenna is securely installed to the Wi-Fi ports.
NOTE: For more details on BIOS configurations, please refer to Manual & Document under the Support tab of the product information site, or visit https://www.asus.com/support. Knowing UEFI BIOS BIOS (Basic Input and Output System) stores system hardware settings such as storage device configuration, overclocking settings, advanced power management, and boot device configuration that are needed for system startup in the motherboard CMOS.
ASUS EZ Flash The ASUS EZ Flash feature allows you to update the BIOS without using an OS-based utility. IMPORTANT! Ensure to load the BIOS default settings to ensure system compatibility and stability. Select the Load Optimized Defaults item under the Exit menu or press the <F5> hotkey.
ASUS CrashFree BIOS 3 The ASUS CrashFree BIOS 3 utility is an auto recovery tool that allows you to restore the BIOS file when it fails or gets corrupted during the updating process. You can restore a corrupted BIOS file using a USB flash drive that contains the BIOS file.
RAID configurations The motherboard supports RAID configurations. RAID definitions RAID 0 (Data striping) optimizes two identical hard disk drives to read and write data in parallel, interleaved stacks. Two hard disks perform the same work as a single drive but at a sustained data transfer rate, double that of a single disk alone, thus improving data access and storage.
Appendix General Notices FCC Compliance Information Responsible Party: Asus Computer International Address: 48720 Kato Rd., Fremont, CA 94538, USA Phone / Fax No: (510)739-3777 / (510)608-4555 This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
ASUS follows the green design concept to design and manufacture our products, and makes sure that each stage of the product life cycle of ASUS product is in line with global environmental regulations. In addition, ASUS disclose the relevant information based on regulation requirements.
Page 37
ASUS products sold in Vietnam, on or after September 23, 2011,meet the requirements of the Vietnam Circular 30/2011/TT-BCT. Các sản phẩm ASUS bán tại Việt Nam, vào ngày 23 tháng 9 năm2011 trở về sau, đều phải đáp ứng các yêu cầu của Thông tư 30/2011/TT-BCT của Việt Nam.
Notices for Wi-Fi model FCC RF Caution Statement WARNING: Any changes or modifications not expressly approved by the party responsible for compliance could void your authority to operate the equipment. FCC 5.925-7.125 GHz Caution Statement Operation of transmitters in the 5.925-7.125 GHz band is prohibited for control of or communications with unmanned aircraft systems.
Page 40
ASUSTek Computer Inc. hereby declares that this device is in compliance with the essential requirements and other relevant provisions of The Radio Equipment Regulations 2017 (S.I. 2017/1206). Full text of UKCA declaration of conformity is available at https://www.asus.com/support/. The WiFi operating in the band 5150-5350MHz shall be restricted to indoor use for the country listed below:...
Page 41
2014/53/EU. Cijeli Dichiarazione di conformità UE semplificata tekst EU izjave o sukladnosti dostupan je na https://www.asus.com/support/. ASUSTek Computer Inc. con la presente dichiara che questo dispositivo è WiFi koji radi na opsegu frekvencija 5150-5350 MHz bit će ograničen na...
Page 42
Luxembourg (LU), Holland (NL), Norge (NO), Rumænien (RO), Slovakiet Οδηγίας 2014/53/ΕE. Το πλήρες κείμενο της δήλωσης συμμόρφωσης της ΕΕ (SK), Slovenien (SI), Spanien (ES), Schweiz (CH). είναι διαθέσιμο στη διεύθυνση https://www.asus.com/support/. Vereenvoudigd EU-conformiteitsverklaring Το WiFi που λειτουργεί στη ζώνη 5150-5350MHz περιορίζεται για χρήση σε...
Page 43
Az EU megfelelőségi nyilatkozat teljes szövegét a következő frekvensområdet 5945 til 6425 MHz i Østerrike (AT), Belgia (BE), Bulgaria weboldalon tekintheti meg: https://www.asus.com/support/. (BG), Kypros (CY), Tsjekkia (CZ), Estland (EE), Frankrike (FR), Tyskland Az 5150-5350 MHz-es sávban működő Wi-Fi-t beltéri használatra kell (DE), Island (IS), Irland (IE), Latvia (LV), Luxembourg (LU), Nederland korlátozni az alábbi táblázatban felsorolt országokban:...
Page 44
Direktive 2014/53/EU. Polno conformitate cu reglementările esențiale și cu celelalte prevederi relevante besedilo izjave EU o skladnosti je na voljo na https://www.asus.com/support/. ale Directivei 2014/53/UE. Textul complet al declarației de conformitate UE WiFi, ki deluje v pasovnem območju 5150–5350 MHz, mora biti v državah, este disponibil la adresa https://www.asus.com/support/.
Page 45
<25 gereksinimlerine ve diğer ilgili hükümlerine uygun olduğunu bildirir. AB uygunluk bildiriminin tam metni şu adreste bulunabilir: 5.925 - 6.425 GHz <200 https://www.asus.com/support/. Bluetooth 2.4 - 2.4835 GHz <100 5150-5350 MHz arasındaki WiFi çalışması, tabloda listelenen ülkeler için iç mekân kullanımıyla kısıtlanacaktır.
Français AsusTek Computer Inc. déclare par la présente que cet appareil est conforme aux critères essentiels et autres clauses pertinentes des directives concernées. La déclaration de conformité de l’UE peut être téléchargée à partir du site Internet suivant : www.asus.com/support Deutsch ASUSTeK Computer Inc.
Page 47
Español Por la presente, ASUSTeK Computer Inc. declara que este dispositivo cumple los requisitos básicos y otras disposiciones pertinentes de las directivas relacionadas. El texto completo de la declaración de la UE de conformidad está disponible en: www.asus.com/support Svenska ASUSTeK Computer Inc. förklarar härmed att denna enhet överensstämmer med de grundläggande kraven och andra relevanta föreskrifter i relaterade direktiv.
ASUS offers a voluntary manufacturer’s Commercial Guarantee. • ASUS tilbyder en valgfri handelsmæssig garanti. • ASUS reserves the right to interpret the provisions of the ASUS • ASUS forbeholder sig retten til at fortolke bestemmelserne i ASUS’ Commercial Guarantee. handelsmæssige garanti.
Page 49
Wszelkie informacje na temat gwarancji można znaleźć na stronie https://www.asus.com/ua/support. https://www.asus.com/pl/support. Компан я ASUS не не се в дпов дальност за шкоду, запод яну життю, Informații despre garanția ASUS здоров’ю чи майну користувача або нших ос б внасл док використання...
Page 50
ASUS. • Bảo hành thương mại này của ASUS được cung cấp độc lập và ngoài Bảo đảm pháp lý theo luật định và không có cách nào ảnh hưởng đến hoặc giới hạn các quyền theo Bảo lãnh pháp lý. Để biết tất cả các thông tin bảo hành, vui lòng truy cập...
Need help?
Do you have a question about the PRIME B860M-A Series and is the answer not in the manual?
Questions and answers