MSI Pro B840M-P WiFi6E AMD AM5

Description

Professional-Grade B840 Micro-ATX with Wi-Fi 6E

The PRO B840M-P WiFi6E brings MSI’s professional PRO series positioning to the B840 Micro-ATX tier, delivering a business and productivity-focused AM5 platform with Wi-Fi 6E, Realtek 2.5GbE, and a well-rounded USB stack in a compact 244 mm × 244 mm footprint. The 6-layer, 2oz copper PCB with 7 W/mk MOSFET thermal pads and Core Boost technology provides stable, sustained power delivery for everyday Ryzen builds and professional multi-core workloads. Both M.2 slots are CPU-connected at PCIe 4.0 x4 — a meaningful differentiator over boards that route the secondary M.2 through slower chipset lanes. CUDIMM support (clock driver bypass mode) is included for builders using next-generation memory modules. MSI’s Frozr AI Cooling auto-detects PWM/DC fan modes, and the Flash BIOS Button with Clear CMOS button on the rear panel makes servicing and first-boot preparation straightforward. Notably for a PRO series board, three ARGB and one RGB header are included — giving builders lighting control without stepping to the Gaming series.

⚠️ The B840 chipset does not support CPU overclocking. Memory overclocking via EXPO profiles is supported up to DDR5-8000+ (OC). If CPU OC is a requirement, step up to a B850 board.

⚠️ DIMM slots on this board have single-sided latches only — the standard dual-latch release mechanism is not present. Take care when seating and removing memory modules.

Memory and Storage

Four DDR5 UDIMM slots support dual-channel operation up to 256 GB, with EXPO profiles reaching DDR5-8000+ (OC) in optimal 1DPC 1R configurations with Ryzen 9000. CUDIMM support in clock driver bypass mode is available. Both M.2 slots are CPU-connected at PCIe 4.0 x4 (64 Gb/s): M2_1 and M2_2 both support 2280 and 2260 form factors. Four SATA 6Gb/s ports handle traditional drive storage, with RAID 0/1/10 for SATA and RAID 0/1 for NVMe.

⚠️ Neither M.2 slot supports the 22110 extended form factor — both are limited to 2280 and 2260. If a 110mm enterprise or extended NVMe drive is required, a board with 22110 support is needed.

⚠️ M2_2 drops from PCIe 4.0 x4 to PCIe 4.0 x2 with Ryzen 8500/8300 processors specifically. All other Ryzen 7000, 8000 (Phoenix 1), and 9000 variants run both M.2 slots at the full PCIe 4.0 x4 rate.

⚠️ No PCIe Gen5 M.2 is present on this board — the fastest M.2 speed is PCIe 4.0 x4 (64 Gb/s). B850 is required for Gen5 NVMe.

Connectivity and I/O

The rear panel provides nine USB ports: one USB 10 Gbps Type-C, one USB 10 Gbps Type-A, two USB 5 Gbps Type-A, and four USB 2.0, alongside HDMI 2.1 (4K 60Hz), a Clear CMOS button, dual antenna connectors for Wi-Fi, and a Flash BIOS Button — no CPU or RAM required to update firmware. There is no DisplayPort on this board. Front panel USB headers cover two USB 5 Gbps Type-A, one USB 5 Gbps Type-C, and four USB 2.0. Realtek 8125D 2.5GbE handles wired networking. Wi-Fi 6E (802.11ax, 2.4/5/6 GHz, 160 MHz, MU-MIMO) and Bluetooth 5.3 are pre-installed in the M.2 Key-E slot. Fan headers total four: one CPU fan, one combo pump/system fan, and three system fan headers. Three Addressable V2 (ARGB) headers and one RGB LED header support Mystic Light. Four EZ Debug LEDs (CPU/DRAM/VGA/BOOT) plus an EZ Memory Detection LED assist boot troubleshooting.

⚠️ Only HDMI 2.1 is available for iGPU display output — no DisplayPort is present on the rear panel. Monitors requiring DisplayPort input will need a discrete GPU.

⚠️ No onboard display output other than HDMI. A discrete GPU is required for non-G Ryzen 7000/9000 CPUs regardless.

Key Highlights

• AMD B840 chipset, Socket AM5 — no CPU overclocking
• Supports Ryzen 7000, 8000, and 9000 Series
• Micro-ATX form factor — 243.84 mm × 243.84 mm
• Core Boost, 6-layer 2oz copper PCB, 7 W/mk MOSFET thermal pads
• Single 8-pin ATX12V CPU power connector
• 4× DDR5 UDIMM slots, dual-channel, up to 256 GB, DDR5-8000+ (OC)
• Single-sided DIMM latches
• EXPO support, CUDIMM support (clock driver bypass mode)
• 1× M.2 PCIe 4.0 x4 (CPU, 64 Gb/s, 2280/2260) — M2_1
• 1× M.2 PCIe 4.0 x4 (CPU, 64 Gb/s, 2280/2260) — M2_2 (x2 with Ryzen 8500/8300)
• No 22110 M.2 support, no Gen5 M.2
• 4× SATA 6Gb/s ports
• RAID 0/1/10 for SATA / RAID 0/1 for NVMe
• 1× PCIe 4.0 x16 (primary GPU, Steel Armor) + 1× PCIe 3.0 x1 (chipset)
• HDMI 2.1 (4K 60Hz) only — no DisplayPort
• Realtek 8125D 2.5GbE LAN
• Wi-Fi 6E (802.11ax, 2.4/5/6 GHz, 160 MHz, MU-MIMO) + Bluetooth 5.3
• 9× rear USB: Gen2 Type-C (10 Gbps) + Gen2 Type-A (10 Gbps) + 2× Gen1 Type-A (5 Gbps) + 4× USB 2.0
• Front USB: USB 5 Gbps Type-C header + 2× USB 5 Gbps Type-A + 4× USB 2.0
• 1× CPU fan + 1× combo pump/sys fan + 3× system fan headers — Frozr AI Cooling
• 3× ARGB V2 headers + 1× RGB header — Mystic Light
• 4× EZ Debug LEDs + 1× EZ Memory Detection LED
• Flash BIOS Button + Clear CMOS button — rear
• Tuning Controller connector (JDASH), COM port header, TPM 2.0 header, chassis intrusion header
• Realtek ALC897 7.1-Ch HD Audio, Audio Boost

 

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