MSI B840 Gaming Plus WiFi AMD AM5

Description

B840 ATX with Wi-Fi 7, Built for Gaming

The B840 Gaming Plus WiFi is MSI’s mainstream B840 ATX offering, bringing full Wi-Fi 7 tri-band wireless with MLO (Multi-Link Operation) support, Realtek 2.5GbE LAN, and PCIe 4.0 platform performance to a full ATX form factor at an accessible price point. The 7+2+1 phase Direct CPU power design uses Core Boost technology with 7 W/mk MOSFET thermal pads and an Extended Heatsink with additional choke thermal pads — Frozr Guard thermal management is MSI’s approach to sustained power delivery efficiency at this VRM tier. CUDIMM support (clock-driven UDIMM) is a notable addition for boards at this price, allowing DDR5 memory with on-module clock buffers to reach higher stable frequencies. Both M.2 slots carry EZ M.2 Shield Frozr II heatsinks with tool-free latch clips for simple SSD installation and removal, and the PCIe 4.0 x16 primary slot features Steel Armor reinforcement. The rear I/O includes a Flash BIOS Button for firmware updates without CPU or RAM, and a Clear CMOS button for recovery — both useful for first-time platform builds.

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

⚠️ The 7+2+1 Direct VRM is best suited to 65W TDP processors for sustained workloads. Higher-TDP Ryzen 9 chips will run at stock, but sustained heavy all-core loads push this power stage to its limits.

⚠️ Wi-Fi 7 features (including MLO and the 6 GHz band) require Windows 11 version 24H2 or later. Bluetooth 5.4 also requires Windows 11 24H2. On earlier Windows versions, the adapter operates at Wi-Fi 6E speeds.

Memory and Storage

Four DDR5 UDIMM slots support dual-channel operation up to 256 GB, with EXPO and XMP profiles reaching DDR5-8000+ (OC) in optimal configurations with Ryzen 9000. CUDIMM support in clock driver bypass mode is available — note that POR boot frequency and compatibility may vary by CPU series. Two M.2 slots are both CPU-connected at PCIe 4.0 x4: M2_1 supports 2280 and 2260, while M2_2 supports 22110, 2280, and 2260. Both are covered by EZ M.2 Shield Frozr II heatsinks. Four SATA 6Gb/s ports handle additional storage, with RAID 0/1/10 for SATA and RAID 0/1 for NVMe.

⚠️ No PCIe Gen5 M.2 slot is present — the fastest M.2 tier is PCIe 4.0 x4 (64 Gb/s). For Gen5 NVMe speeds, a B850 board is required.

⚠️ M2_2 drops from PCIe 4.0 x4 to PCIe 3.0 x4 with Ryzen 8700/8600/8400 processors, and further to PCIe 3.0 x2 with Ryzen 8500/8300. The primary GPU slot (PCI_E1) also drops from PCIe 4.0 x16 to x8 and x4 respectively with those Ryzen 8000 Phoenix variants.

⚠️ Only two M.2 slots are present. Three-drive NVMe builds will need SATA for the additional drive.

Connectivity and I/O

The rear panel provides a well-specified USB stack for the price: one USB 10 Gbps Type-A, one USB 10 Gbps Type-C, two USB 5 Gbps Type-A, and four USB 2.0 — nine ports total. Only a single HDMI 2.1 (4K 60Hz) display output is available — there is no DisplayPort on the rear panel. Wi-Fi 7 (802.11be, 2.4/5/6 GHz, 320 MHz, MU-MIMO, MLO, 4KQAM, up to 5.8 Gbps) and Bluetooth 5.4 are handled by a pre-installed module in the M.2 Key-E slot, alongside Realtek 8125BG 2.5GbE LAN. Front panel headers include two USB 5 Gbps Type-A, one USB 5 Gbps Type-C, and four USB 2.0. Fan headers total six: one CPU, one combo fan/pump, and four system fan headers. RGB is covered by two Addressable V2 (ARGB) headers and one standard RGB LED header via Mystic Light, plus an EZ Conn header (JAF_1) for daisy-chain lighting. Four EZ Debug LEDs (CPU/DRAM/VGA/BOOT) provide boot diagnostics, and a Tuning Controller connector (JDASH) supports MSI’s external OC dashboard accessory.

⚠️ No DisplayPort is present on this board — the sole display output is HDMI 2.1. Monitors requiring DisplayPort will need a discrete GPU.

⚠️ The Wireless module occupies the M.2 Key-E slot — no additional wireless module can be installed.

⚠️ Integrated display output (HDMI 2.1) requires a Ryzen processor with integrated Radeon graphics. Non-G Ryzen 7000/9000 CPUs require a discrete GPU.

Key Highlights

• AMD B840 chipset, Socket AM5 — no CPU overclocking
• Supports Ryzen 7000, 8000, and 9000 Series
• ATX form factor — 243.84 mm × 304.8 mm
• 7+2+1 phase Direct CPU power, Core Boost, Frozr Guard (7 W/mk thermal pads, Extended Heatsink)
• Single 8-pin ATX12V CPU power connector
• 4× DDR5 UDIMM slots, dual-channel, up to 256 GB, DDR5-8000+ (OC)
• EXPO and XMP support, CUDIMM support (clock driver bypass mode)
• 1× M.2 PCIe 4.0 x4 (CPU, 2280/2260, EZ M.2 Shield Frozr II) — M2_1
• 1× M.2 PCIe 4.0 x4 (CPU, 22110/2280/2260, EZ M.2 Shield Frozr II) — M2_2 (PCIe 3.0 with Ryzen 8000)
• 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) + 3× PCIe 3.0 x1 + 1× PCIe 3.0 x4 (chipset)
• HDMI 2.1 (4K 60Hz) — only display output, no DisplayPort
• Realtek 8125BG 2.5GbE LAN
• Wi-Fi 7 (802.11be, 2.4/5/6 GHz, 320 MHz, MLO, MU-MIMO) + Bluetooth 5.4 — requires Windows 11 24H2
• Rear USB: Gen2 Type-A (10 Gbps) + Gen2 Type-C (10 Gbps) + 2× USB 5 Gbps Type-A + 4× USB 2.0
• Front USB: 2× USB 5 Gbps Type-A + USB 5 Gbps Type-C + 4× USB 2.0
• 1× CPU fan + 1× combo fan/pump + 4× system fan headers
• 2× ARGB V2 headers + 1× RGB header — Mystic Light
• 4× EZ Debug LEDs (CPU/DRAM/VGA/BOOT)
• Flash BIOS Button + Clear CMOS button — rear
• EZ Conn header (JAF_1) for daisy-chain lighting
• Tuning Controller connector (JDASH)
• COM port header, TPM 2.0 header, chassis intrusion header
• No PCIe Gen5 M.2, no DisplayPort, no CPU OC

 

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