Model:	PRIME B840M-A-CSM
Product Number:	90MB1J10-M0EAYC
CPU	AMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors*
Chipset	AMD B840 Chipset
BIOS	256 Mb Flash ROM, UEFI AMI BIOS
Operating System	Windows 11, Windows 10 64-bit
Form Factor	micro-ATX Form Factor 9.6 inch x 9.6 inch (24.4 cm x 24.4 cm)
Manageability	WOL by PME, PXE
Memory	4 x DIMM slots, max. 256GB, DDR5 Support up to 7600+MT/s (OC), with Ryzen™ 9000 & 8000 & 7000 Series Processors, ECC and Non-ECC, Un-buffered DIMM // Dual channel memory architecture // Supports AMD Extended Profiles for Overclocking (EXPO™) // ASUS Enhanced Memory Profile (AEMP) // Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information please refer to CPU/Memory Support list under the Support tab of product information site // Adjustments will be made based on the specifications of mass-produced memory products available on the market. // Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.
Expansion Slots	AMD Ryzen™ 9000 & 7000 Series Desktop Processors: 1 x PCIe 4.0 x16 slot (supports x16 mode) // AMD Ryzen™ 8000 Series Desktop Processors: 1 x PCIe 4.0 x16 slot (supports x8/x4 mode) // AMD B840 Chipset: 2 x PCIe 3.0 x16 slots (support x1 mode) // Specifications vary by CPU types. // To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.
Graphics	2 x DisplayPort // 1 x HDMI™ port // Graphics specifications may vary between CPU types. Please refer to AMD CPU // Supports max. 8K@30Hz as specified in DisplayPort 1.4. // Supports 4K@60Hz as specified in HDMI 2.1.
Storage	Total supports 3 x M.2 slots and 4 x SATA 6Gb/s ports // AMD Ryzen™ 9000 & 7000 Series Desktop Processors: M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode) - M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode) // AMD Ryzen™ 8000 Series Desktop Processors: M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode) - M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4/x2 mode) // AMD B840 Chipset: M.2_3 slot (Key M), type 2280 (supports PCIe 3.0 x4 mode) // 4 x SATA 6Gb/s ports Specifications vary by CPU types. // AMD RAIDXpert2 Technology // Ryzen™ 9000 Series Processors: RAID 0/1/5/10 // Ryzen™ 8000 Series Processors: RAID 0/1 // Ryzen™ 7000 Series Processors: RAID 0/1/10
USB	Rear USB (Total 7 ports): 2 x USB 10Gbps ports (2 x Type-A) - 1 x USB 5Gbps port (1 x USB Type-C®) - 4 x USB 2.0 ports (4 x Type-A) // Front USB (Total 7 ports): 1 x USB 5Gbps connector (supports USB Type-C®) - 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports - 2 x USB 2.0 headers support 4 additional USB 2.0 ports // USB Type-C® power delivery output: max. 5V/3A
Back Panel I/O Ports	2 x USB 10Gbps ports (2 x Type-A) // 1 x USB 5Gbps port (1 x USB Type-C®) // 4 x USB 2.0 ports (4 x Type-A) // 2 x DisplayPort // 1 x HDMI™ port // 1 x Realtek 2.5Gb Ethernet port // 3 x Audio jacks // 1 x BIOS FlashBack™ button
Audio	Realtek 7.1 Surround Sound // High Definition Audio CODEC: Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking - Supports up to 24-Bit/192 kHz playback // Audio Features: Audio Shieldin - Premium audio capacitors - Dedicated audio PCB layers // A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.
Accessories	Cables: 2 x SATA 6Gb/s cables // Miscellaneous: 1 x M.2 rubber package - 2 x Screw packages for M.2 SSD // Documentation: 1 x ACC Express Activation Key Card - 1 x Quick start guide
Internal I/O Connectors	Fan and Cooling Related: 1 x 4-pin CPU Fan header - 1 x 4-pin CPU OPT Fan header - 2 x 4-pin Chassis Fan headers // Power Related: 1 x 24-pin Main Power connector - 1 x 8-pin +12V CPU Power connector // Storage Related: 3 x M.2 slots (Key M) - 4 x SATA 6Gb/s ports // USB: 1 x USB 5Gbps connector (supports USB Type-C® ) - 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports - 2 x USB 2.0 headers support 4 additional USB 2.0 ports // Miscellaneous: 3 x Addressable Gen 2 headers - 1 x Clear CMOS header - 1 x COM Port header - 1 x Front Panel Audio header (F_AUDIO) - 1 x S/PDIF Out header - 1 x SPI TPM header (14-1 pin) - 1 x 10-1 pin Front Panel System header
Special Features	ASUS 5X PROTECTION III: DIGI+ VRM - LANGuard - Overvoltage Protection - SafeSlot Core - Stainless-Steel Back I/O // ASUS Q-Design: - Q-Dashboard - Q-DIMM - Q-LED Core - Q-Slot // ASUS Thermal Solution: VRM heatsink design - M.2 heatsink // ASUS EZ DIY: BIOS FlashBack™ button - BIOS FlashBack™ LED - Pre-mounted I/O shield // Aura Sync: Addressable Gen2 headers
Software Features	ASUS Exclusive Software: Armoury Crate: Aura Sync - Aura Creator - Fan Xpert 2+ - Power Saving // ASUS AI Advisor // ASUS DriverHub // TurboV Core // ASUS CPU-Z // Norton 360 Deluxe (60 Days Free Trial) // WinRAR (40 Days Free Trial ) // UEFI BIOS: ASUS EZ DIY: ASUS CrashFree BIOS 3 - ASUS EZ Flash 3 - ASUS UEFI BIOS EZ Mode - ASUS MyHotkey
Ethernet	1 x Realtek 2.5Gb Ethernet // ASUS LANGuard
Remote Management Features	IT Management software supported - ASUS Control Center Express (ACCE)

ASUS PRIME B840M-A-CSM AM5 Micro-ATX Motherboard

Product Description