MSI PRO B850M-A WIFI mATX AM5 Motherboard, AMD B850 Chipset, 4x DDR5 UDIMM Slots, 256GB Max Memory, 2x PCI-E x16 Slot, 2x M.2 Slots, WiFi7 & BT 5.4 Connectivity | 911-7E66-002

Chipset

AMD B850

CPU Support

AMD Ryzen™ 9000 / 8000 / 7000 Series Desktop Processors

Socket

AM5

Memory

4 × DDR5 UDIMM, up to 256 GB
Supports DDR5 8200–5600 (OC) / 5600–4800 (JEDEC) MT/s
Ryzen™ 9000 Series Max OC:
• 1DPC 1R: up to 8200+ MT/s
• 1DPC 2R: up to 6400+ MT/s
• 2DPC 1R: up to 6400+ MT/s
• 2DPC 2R: up to 6000+ MT/s
Supports AMD POR/JEDEC speeds, Dual-channel, AMD EXPO™, Overclocking, Non-ECC, Unbuffered, and CUDIMM (Clock Driver bypass mode only)*
*CUDIMM and POR boot frequency depend on CPU. DIMM slots use single latches. Refer to MSI memory QVL for details.

Onboard Graphics

1 × HDMI™ 2.1 (4K 60Hz)
1 × DisplayPort 1.4 (4K 60Hz)
*Only for CPUs with integrated graphics.

Expansion Slots

2 × PCI-E x16
1 × PCI-E x1
PCI_E1: PCIe 5.0 x16 (CPU)
PCI_E2: PCIe 3.0 x1 (Chipset)
PCI_E3: PCIe 4.0 x4 (Chipset)
PCI_E1 Slot:
• PCIe 5.0 x16 (Ryzen™ 9000/7000)
• PCIe 4.0 x8 (Ryzen™ 8700/8600/8400)
• PCIe 4.0 x4 (Ryzen™ 8500/8300)

Audio

Realtek® ALC897, 7.1-Channel HD Audio

Storage

2 × M.2 (2280/2260)
• M2_1 (CPU): PCIe 5.0 x4 (Ryzen™ 9000/7000) / PCIe 4.0 x4 (Ryzen™ 8000)
• M2_2 (CPU): PCIe 4.0 x4 / x2 (Ryzen™ 8500/8300)
4 × SATA 6G ports*Refer to manual for M.2 heatsink limits

RAID Support

RAID 0/1/10 for SATARAID 0/1 for M.2 NVMe

USB Ports

Front: 4 × USB 2.0, 2 × USB 5Gbps Type-A, 1 × USB 10Gbps Type-C
Rear: 3 × USB 5Gbps Type-A, 3 × USB 10Gbps Type-A, 2 × USB 10Gbps Type-C

LAN

Realtek® 8126VB 5G LAN

Internal I/O

1 × 24-pin ATX_PWR
2 × 8-pin CPU_PWR
1 × PCIe_PWR (8-pin)
1 × CPU Fan
1 × Combo Fan (Pump/Sys Fan)
3 × System Fans
2 × Front Panel (JFP)
1 × Chassis Intrusion (JCI)
1 × Front Audio (JAUD)
1 × COM (JCOM)
1 × Tuning Controller (JDASH)
3 × ARGB V2 (JARGB_V2)
1 × RGB (JRGB)
1 × TPM 2.0 header
4 × USB 2.0
2 × USB 5Gbps Type-A
1 × USB 10Gbps Type-C

Wireless LAN & Bluetooth

Wi-Fi 7 (802.11 be), pre-installed M.2 Key-E module
Supports MU-MIMO TX/RX, 2.4/5/6GHz up to 2.9Gbps
Bluetooth® 5.4*
*, MLO, 4KQAM*6GHz availability depends on region*
*Requires Windows 11 24H2

LED Features

4 × EZ Debug LED
1 × EZ Memory Detection LED

Back Panel Ports

Clear CMOS Button
DisplayPort
2 × USB 10Gbps Type-A
2 × USB 5Gbps Type-A
1 × USB 10Gbps Type-C5G LANWi-Fi / Bluetooth Antennas
Audio connectors
Flash BIOS Button
HDMI™

Operating System

Windows® 11 64-bit

Form Factor (PCB Info)

mATX – 243.84 × 243.84 mm

Box Contents

Motherboard, user manual, accessories (varies by region)