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Dark green rectangular circuit board with silver heatsinks and black expansion slots

ASUS

ASUS Pro WS B850M-ACE SE AMD motherboard

SKU CH-6594-EAFV6 MPN Pro WS B850M-ACE SE

A micro-ATX AMD B850 board for Ryzen 9000, 8000 and 7000 desktop CPUs plus EPYC 4005, with four DDR5 slots up to 256 GB, PCIe 5.0 x16 and dual PCIe 5.0 M.2, 10 Gb and 2.5 Gb LAN.

  • ProcessorAMD Socket AM5 for AMD Ryzen 9000 & 8000 & 7000 Series Deskt
  • ChipsetAMD B850
  • Form factorMicro ATX
  • CPU socketAM5
  • Memory slot count4 × 288pin (DDR5)
  • Supported memoryDDR5 5600 / DDR5 8000
  • AM5 socket supports Ryzen 9000, 8000, 7000 and EPYC 4005 processors
  • DDR5 memory up to 256 GB with EXPO profiles and ECC support
  • PCIe 5.0 x16 slot plus two PCIe 5.0 M.2 slots for high-speed storage
  • Dual 10 Gbps and 2.5 Gbps LAN with USB 10 Gbps Type-C front header
  • Onboard BMC AST2600 enables IPMI remote management via ASUS Control Center Express

Socket AM5 workstation board

The ASUS Pro WS B850M-ACE SE is a microATX motherboard built for AMD Ryzen 9000 8000 7000 Series and EPYC 4005 Series processors. It targets professionals who need server-grade remote management and high-speed storage in a compact form factor. Onboard BMC AST2600 and ASUS Control Center Express enable real-time monitoring for 24/7 operation. ECC un-buffered DDR5 support adds data integrity for critical workloads.

PCIe 5.0 and 4.0 lane allocation

The primary x16 slot runs at PCIe 5.0 x16 with Ryzen 9000 7000 and EPYC 4005 CPUs but drops to PCIe 4.0 x8 or x4 with Ryzen 8000 Series chips. A second chipset-driven x16 slot is limited to PCIe 4.0 x4. Two M.2 2280 slots connect directly to the CPU at PCIe 5.0 x4 each while an MCIO connector adds further NVMe expansion. Four SATA 6Gb/s ports provide legacy drive support.

256 GB DDR5 ceiling

Four 288-pin slots accept up to 256 GB of dual-channel DDR5 with AMD EXPO profiles spanning 5600 to 8000 MT/s. ECC capability is available across the full capacity range. This memory limit is the single figure that determines whether the board can handle large dataset processing or virtualisation clusters.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $291.99
Pricier than about 55% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model namePro WS B850M-ACE SE
Processor
ProcessorAMD Socket AM5 for AMD Ryzen 9000 & 8000 & 7000 Series Desktop Processors and AMD EPYC 4005 Series Processors
CPU socketAM5
ChipsetAMD B850
Memory
Memory slot count4 × 288pin (DDR5)
Supported memoryDDR5 5600 / DDR5 8000
Max supported RAM256 GB
Memory channelsDual Channel
Memory profilesAMD EXPO
ECC supportYes
BufferingUn-buffered
Storage
SATA ports4 x SATA 6Gb/s
Audio & video
Audio chipRealtek 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.
Connectivity
Maximum network speed10 Gbit/s + 2.5 Gbit/s + 1Gbp
Ports & slots
PCIe 4.0 x16 slotsAMD B850 Chipset
1 x PCIe 4.0 x16 slot (supports x4 mode)
PCI slots2 x PCI Slots
Power
Power connectors24 Pin
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in
Shipping weight1.36 kg
Package size279 × 279 × 76 mm
More details
BIOS512 Mb Flash ROM, UEFI AMI BIOS (text-based)

Questions about this item

Will this board fit in a standard mATX case and still leave room for a dual-slot graphics card?

The board uses the mATX form factor with a single PCIe 5.0 x16 slot running at x16 with Ryzen 9000, 7000 or EPYC 4005 series CPUs. A dual-slot card installs directly into that slot; the two legacy PCI slots sit below it and do not interfere.

Can I run four DDR5 modules at the rated 8000 speed with ECC enabled?

The board supports up to 256 GB across four 288-pin slots in dual-channel mode. AMD EXPO profiles up to 8000 are validated and ECC is supported with un-buffered modules; actual stability depends on the CPU memory controller and module quality.

Which M.2 slots provide PCIe 5.0 x4 throughput for the OS drive?

Both M.2_1 and M.2_2 are Key M 2280 slots wired for PCIe 5.0 x4 when a Ryzen 9000, 7000 or EPYC 4005 series processor is installed. Either slot can host the boot drive at full speed.

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