What are the maximum memory specifications for this motherboard?

This motherboard supports a maximum memory of 256GB, using 4 memory slots for DDR5 memory, with a memory standard of DDR5 5600 / DDR5 8000.

What types of processors are compatible with the ASUS Pro WS B850M-ACE SE motherboard?

The ASUS Pro WS B850M-ACE SE motherboard is compatible with AMD Ryzen 9000, 8000, and 7000 Series desktop processors, as well as AMD EPYC 4005 Series processors.

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Main image of ASUS Pro WS B850M-ACE SE AMD AM5 B850 mATX MicroATX Business motherboard, PCIe 5.0 x 16, DDR5, 2x PCIe 5.0 M.2, PCIe 5.0 MCIO, U.2, 10G & 2.5G LAN, USB4, ASUS Control Center Express Remote Management

Alt view image 2 of 9 - ASUS Pro WS B850M-ACE SE AMD AM5 B850 mATX MicroATX Business motherboard, PCIe 5.0 x 16, DDR5, 2x PCIe 5.0 M.2, PCIe 5.0 MCIO, U.2, 10G & 2.5G LAN, USB4, ASUS Control Center Express Remote Management

Alt view image 3 of 9 - ASUS Pro WS B850M-ACE SE AMD AM5 B850 mATX MicroATX Business motherboard, PCIe 5.0 x 16, DDR5, 2x PCIe 5.0 M.2, PCIe 5.0 MCIO, U.2, 10G & 2.5G LAN, USB4, ASUS Control Center Express Remote Management

Alt view image 4 of 9 - ASUS Pro WS B850M-ACE SE AMD AM5 B850 mATX MicroATX Business motherboard, PCIe 5.0 x 16, DDR5, 2x PCIe 5.0 M.2, PCIe 5.0 MCIO, U.2, 10G & 2.5G LAN, USB4, ASUS Control Center Express Remote Management

Alt view image 5 of 9 - ASUS Pro WS B850M-ACE SE AMD AM5 B850 mATX MicroATX Business motherboard, PCIe 5.0 x 16, DDR5, 2x PCIe 5.0 M.2, PCIe 5.0 MCIO, U.2, 10G & 2.5G LAN, USB4, ASUS Control Center Express Remote Management

Alt view image 6 of 9 - ASUS Pro WS B850M-ACE SE AMD AM5 B850 mATX MicroATX Business motherboard, PCIe 5.0 x 16, DDR5, 2x PCIe 5.0 M.2, PCIe 5.0 MCIO, U.2, 10G & 2.5G LAN, USB4, ASUS Control Center Express Remote Management

Alt view image 7 of 9 - ASUS Pro WS B850M-ACE SE AMD AM5 B850 mATX MicroATX Business motherboard, PCIe 5.0 x 16, DDR5, 2x PCIe 5.0 M.2, PCIe 5.0 MCIO, U.2, 10G & 2.5G LAN, USB4, ASUS Control Center Express Remote Management

Alt view image 8 of 9 - ASUS Pro WS B850M-ACE SE AMD AM5 B850 mATX MicroATX Business motherboard, PCIe 5.0 x 16, DDR5, 2x PCIe 5.0 M.2, PCIe 5.0 MCIO, U.2, 10G & 2.5G LAN, USB4, ASUS Control Center Express Remote Management

Alt view image 9 of 9 - ASUS Pro WS B850M-ACE SE AMD AM5 B850 mATX MicroATX Business motherboard, PCIe 5.0 x 16, DDR5, 2x PCIe 5.0 M.2, PCIe 5.0 MCIO, U.2, 10G & 2.5G LAN, USB4, ASUS Control Center Express Remote Management

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ASUS Pro WS B850M-ACE SE AMD AM5 B850 mATX MicroATX Business motherboard, PCIe 5.0 x 16, DDR5, 2x PCIe 5.0 M.2, PCIe 5.0 MCIO, U.2, 10G & 2.5G LAN, USB4, ASUS Control Center Express Remote Management

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Ready for Advanced AI PCs: Built to power next-gen AI workloads with robust performance, ultrafast connectivity, and future-proof architecture.
AMD AM5 Socket Support: Compatible with AMD Ryzen 9000/8000/7000 Series and AMD EPYC 4005 Series processors.
Ultrafast Connectivity: Two PCIe 5.0/4.0 x16 slot (one at x4), 10 Gb & 2.5 Gb LAN ports, two PCIe 5.0 x4 M.2 slots, front USB 20Gbps Type-C and MCIO NVMe support.
Server-grade IPMI Remote Management: Supports onboard BMC AST2600, along with ASUS Control Center Express IT management software for real-time monitoring and management.
Proven Reliability & Stability: Extensively validated with broad compatibility, a comprehensive QVL, and tested for 24/7 operation.

🔥Don't forget your OS, we have Windows 11 OEM, Download and USB versions available

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PRO WS B850M-ACE SE

Model
Brand	ASUS
Model	Pro WS B850M-ACE SE

Supported CPU
CPU Socket Type	AM5
CPU Type	AMD Socket AM5 for AMD Ryzen 9000 & 8000 & 7000 Series Desktop Processors and AMD EPYC 4005 Series Processors

Chipsets
Chipset	AMD B850

Memory
Number of Memory Slots	4x288pin (DDR5)
Memory Standard	DDR5 5600 / DDR5 8000
Maximum Memory Supported	256GB
Channel Supported	Dual Channel
ECC Supported	Yes
Buffer Supported	Un-buffered

Expansion Slots
PCI Express 5.0 x16	AMD Ryzen 9000 & 7000 Series Desktop Processors and AMD EPYC 4005 Series Processors 1 x PCIe 5.0 x16 slot (supports x16 mode) AMD Ryzen 8000 Series Desktop Processors 1 x PCIe 4.0 x16 slot (supports x8/x4 mode)
PCI Express 4.0 x16	AMD B850 Chipset 1 x PCIe 4.0 x16 slot (supports x4 mode)
PCI Slots	2 x PCI Slots

Storage Devices
Serial ATA (SATA)	4 x SATA 6Gb/s
M.2	AMD Ryzen 9000 & 7000 Series Desktop Processors and AMD EPYC 4005 Series Processors M.2_1 slot (Key M), type 2280 (supports PCIe 5.0 x4 mode) M.2_2 slot (Key M), type 2280 (supports PCIe 5.0 x4 mode) MCIO connector (supports PCIe 5.0 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 2280 (supports PCIe 4.0 x4/x2 mode) MCIO connector (supports PCIe 4.0 x4/x2 mode) AMD B850 Chipset U.2_1 connector supports PCIe 3.0 x4 mode via an SFF-8643 adapter cable. The cable is purchased separately. Specifications vary by CPU types. MCIO connector shares bandwidth with M.2_2 slot. When MCIO connector is operating, M.2_2 slot will be disabled. U.2 shares bandwidth with SATA ports; Enable U.2 in BIOS menu to support a NVMe storage device, and SATA ports will be disabled.

Onboard Audio
Audio Chipset	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 Shielding - Premium audio capacitors - Dedicated audio PCB layers *Due to limitations in HDA bandwidth, 32-Bit/192 kHz is not supported for 7.1 Surround Sound audio.

Onboard LAN
Max LAN Speed	10Gbps + 2.5Gbps + 1Gbp

Rear Panel Ports
Back I/O Ports	3 x USB 10Gbps port(s) (3 x Type-A ) 1 x USB 10Gbps port(s) (USB Type-C) 1 x USB 10Gbps port(s) (USB Type-C) supports DisplayPort video output 2 x USB 2.0 port(s) (2 x Type-A) 1 x DisplayPort 1 x VGA port 1 x HDMI port 1 x Realtek 10Gb Ethernet port 1 x Intel 2.5Gb Ethernet ports 1 x Realtek 1Gb Ethernet (Dedicated management LAN for AST2600) 2 x Audio jacks 1 x Clear CMOS button

Internal I/O Connectors
Onboard USB	1 x USB 5Gbps header(s) support(s) 2 additional USB 5Gbps ports 2 x USB 2.0 header(s) support(s) 4 additional USB 2.0 ports 1 x USB 2.0 port (1 x Type-A) for BIOS FlashBack
Other Connectors	Fan and Cooling Related 1 x 4-pin CPU Fan header(s) 1 x 4-pin CPU OPT Fan header(s) 3 x 4-pin Chassis Fan header(s) 1 x W_PUMP+ header(s) Power Related 1 x 24-pin Main Power connector 1 x 8-pin +12V CPU Power connector 1 x 4-pin +12V CPU Power connector Miscellaneous 1 x BIOS FlashBack button 1 x Chassis Intrusion header 1 x COM Port header 1 x Reset button 1 x Front Panel Audio header (F_AUDIO) 1 x SPI TPM header (14-1 pin) 1 x Start button 1 x 10-1 pin Front Panel System header 1 x RTC Battery header 1 x Thermal Sensor header 1 x Thunderbolt (USB4) header

Physical Spec
Form Factor	Micro ATX
Dimensions (W x L)	9.6" x 9.6"
Power Pin	24 Pin

Software Feature
BIOS Feature	512 Mb Flash ROM, UEFI AMI BIOS (text-based)
Software	ASUS Exclusive Software Armoury Crate - Fan Xpert 4 ASUS DriverHub - ASUS CPU-Z TurboV Core Adobe Creative Cloud (Free Trial) Norton 360 Deluxe (60 Days Free Trial) WinRAR (40 Days Free Trial) UEFI BIOS ASUS EZ DIY - ASUS CrashFree BIOS 3 - ASUSTeK. EzFlash Utility

Features
Features	ASUS 5X PROTECTION III - DIGI+ VRM (- Digital power design with DrMOS) - ESD Guards - LANGuard - Overvoltage protection - SafeSlot - Stainless-steel back I/O ASUS Q-Design - M.2 Q-Latch - Q-Code - Q-Connector - Q-LED (CPU [red], DRAM [yellow], VGA [white], Boot Device [yellow green]) - Q-Slot ASUS Thermal Solution - M.2 heatsink - Aluminum heatsink design ASUS EZ DIY - BIOS FlashBack button - BIOS FlashBack LED - Clear CMOS button - Dual DIMM clips - ProCool II - SafeSlot - SafeDIMM Bespoke Motherboard Design & Business Focused Features - 24/7 reliability - Overcurrent protection

Packaging
Package Contents	Cables 2 x SATA 6Gb/s cables Miscellaneous 1 x I/O shield 1 x Q-connector 1 x M.2 rubber package(s) Documentation 1 x ACC Express activation key card 1 x Quick start guide

Additional Information
First Listed on Newegg	February 19, 2026

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ASUS Pro WS B850M-ACE SE AMD AM5 B850 mATX MicroATX Business motherboard, PCIe 5.0 x 16, DDR5, 2x PCIe 5.0 M.2, PCIe 5.0 MCIO, U.2, 10G & 2.5G LAN, USB4, ASUS Control Center Express Remote Management

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ASUS Pro WS B850M-ACE SE AMD AM5 B850 mATX MicroATX Business motherboard, PCIe 5.0 x 16, DDR5, 2x PCIe 5.0 M.2, PCIe 5.0 MCIO, U.2, 10G & 2.5G LAN, USB4, ASUS Control Center Express Remote Management

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