PC parts / Motherboards
MSIMainstream motherboard
PRO B850M-A WIFI
Released June 2025.1Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026Revision history: Version 2.0, 2025/06, First release. Last checked 16 October 2026.
- CPU socket
- AM5
- Chipset
- AMD B850
- Form factor
- Micro-ATX
- M.2 slots
- 2
63 of 78 fields known.
At a glance
Ports
- 2 USB-C USB 3.2 Gen 2
- 3 USB-A USB 3.2 Gen 2
- 3 USB-A USB 3.2 Gen 1
- HDMI 2.1
- DisplayPort 1.4
- Ethernet (RJ45)
- 3 3.5 mm audio
- USB-C header
- USB 3 header (19-pin)
- 2 USB 2.0 header (9-pin)
General
- GTIN / EAN
- 8241424254599Spec databasebuildcores.com/products/Motherboard/ys4ci1k5t/MSI-PRO-B850M-A-WIFIRead 14 October 2026UPC 824142425459, also shown as EAN 0824142425459. The PZ board has its own code.
- Announced
- 6 January 20256Press articleclub386.com/msi-launches-mid-and-entry-motherboards-for-amds-am5-platformRead 14 October 2026Article of 2025-01-06 announces the Pro B850M-A WiFi with the MSI B850 lineup.
- Status
- Available8Spec databasegeizhals.de/msi-pro-b850m-a-wifi-a3383558.htmlRead 14 October 2026Listed with offers on geizhals.eu on 2026-10-14. The base page showed no offers in one snapshot. BuildCores shows it in stock at Newegg and Walmart.9Spec databasebuildcores.com/products/Motherboard/ys4ci1k5t/MSI-PRO-B850M-A-WIFIRead 14 October 2026Shows Newegg at 168.99 USD and Walmart at 172.99 USD in stock on 2026-10-14.
- Predecessor
- Not available
- Successor
- Not available
- Launch price (US)
- Not available
- Launch price (EU)
- Not available
- Markets
- Not available
- Colours
- Not available
- Board revision
- Not available
Platform
- Supported processors
- AMD Ryzen 9000 Series, AMD Ryzen 8000 Series, AMD Ryzen 7000 Series1Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026Specifications, CPU row: AMD Ryzen 9000/8000/7000 Series Desktop Processors, socket AM5. The manual points to msi.com for the newest support list. Read on 2026-10-14.
Board
Front and side, drawn to scale.
- Board dimensions
- Width244Height244mm(9.6 × 9.6 in)1Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026Specifications: 244 mm x 244 mm. Guru3D, Netcodex and the MSI Taiwan store give 243.84 mm, the exact conversion of 9.6 in.
- PCB layers
- 63Maker product pagemy-store.msi.com/products/msi-pro-b850m-a-wifi-matx-motherboardRead 14 October 2026Product details: 6-layer PCB made by 2oz thickened copper and server-grade level material.4Maker product pagetw-store.msi.com/products/pro-b850m-a-wifiRead 14 October 2026The Chinese text says a 6-layer server-grade PCB with 2oz copper. One search result summary of MSI's global page mentioned 8 layers, which no maker page or document confirmed.6Press articleclub386.com/msi-launches-mid-and-entry-motherboards-for-amds-am5-platformRead 14 October 2026Six-layer PCB.
- RGB lighting on the board
- No1Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026Specifications, LED Features: 4x EZ Debug LED, 1x EZ Memory Detection LED and the RGB and ARGB headers. The list names no lighting on the board itself. BuildCores shows Lighting: None.9Spec databasebuildcores.com/products/Motherboard/ys4ci1k5t/MSI-PRO-B850M-A-WIFIRead 14 October 2026Lighting: none listed. The headers are for external devices.
Power delivery
- Power stage layout
- 8+2+13Maker product pagemy-store.msi.com/products/msi-pro-b850m-a-wifi-matx-motherboardRead 14 October 2026Product details: Direct 8+2+1 Power System 60A SPS, 8+4-pin CPU power connectors.4Maker product pagetw-store.msi.com/products/pro-b850m-a-wifiRead 14 October 2026Text names an 8+2+1 Duet Rail power system with dual 8+4-pin CPU power connectors.6Press articleclub386.com/msi-launches-mid-and-entry-motherboards-for-amds-am5-platformRead 14 October 2026MSI's launch text through Club386: 8+2+1 phases rated at 60A.7Press articleguru3d.com/story/msi-pro-b850ma-wifi-microatx-motherboard-with-wifi-7-and-5-gigabit-lanRead 14 October 20268+2+1 phase design with 60A smart power stages.10Spec databasemaxmybuild.com/motherboards/msi-pro-b850m-a-wifiRead 14 October 20268+2+1 power stage layout, 60A SPS.
- CPU core (Vcore) power stages
- 88Spec databasegeizhals.de/msi-pro-b850m-a-wifi-a3383558.htmlRead 14 October 2026VRM row: 8+2+1, 8x 60 A MP87661 smart power stages for VCORE, 2 for SOC and 1 for misc.
- Vcore power stage rating
- 60A3Maker product pagemy-store.msi.com/products/msi-pro-b850m-a-wifi-matx-motherboardRead 14 October 2026Direct 8+2+1 Power System 60A SPS.6Press articleclub386.com/msi-launches-mid-and-entry-motherboards-for-amds-am5-platformRead 14 October 20268+2+1 phases rated at 60A.7Press articleguru3d.com/story/msi-pro-b850ma-wifi-microatx-motherboard-with-wifi-7-and-5-gigabit-lanRead 14 October 202660A smart power stages.
- CPU power connectors
- 8+4 pin1Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026Specifications, Power Connectors: 1x 24-pin ATX, 1x 8-pin +12V, 1x 4-pin +12V and 1x 8-pin PCIe power connector.3Maker product pagemy-store.msi.com/products/msi-pro-b850m-a-wifi-matx-motherboardRead 14 October 20268+4-pin CPU power connectors.
Memory
- Max memory speed (overclocked)
- 8,200MT/s2Maker spec sheet (PDF)storage-asset.msi.com/datasheet/mb/in/PRO-B850M-A-WIFI.pdfRead 14 October 2026Memory Support: 4 DIMMs, Dual Channel DDR5 - 8200+ MT/s (OC). The maker names no CPU family and no module setup for the figure. The MSI Malaysia store and the Taiwan store say the same. The JEDEC range is 5600 to 4800 MT/s.
Expansion slots
- Expansion slots
Physical slot Electrical lanes PCIe generation Connected to Count PCIe x16 16 5 CPU 1 PCIe x16 4 4 Chipset 1 PCIe x1 1 3 Chipset 1 - Full-length PCIe slots
- 2
- Fastest PCIe x16 slot generation
- 5
Storage
- M.2 storage slots
Slot PCIe generation PCIe lanes Connected to Longest drive Takes SATA drives Heatsink M2_1 5 4 CPU M.2 2280 No Yes M2_2 4 4 CPU M.2 2280 No No Source1Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026Specifications and pages 33 to 37, Ryzen 9000 values. M2_1 is from the CPU, up to PCIe 5.0 x4 (PCIe 4.0 x4 with Ryzen 8000), 2260 and 2280 drives, under the screwless EZ M.2 Shield Frozr II heatsink. M2_2 is from the CPU, up to PCIe 4.0 x4 (PCIe 4.0 x2 with Ryzen 8500 and 8300), 2260 and 2280 drives. The M2_2 install steps show a clip and no heatsink. MaxMyBuild and Geizhals agree that only one M.2 slot has a heatsink. No slot lists an M.2 SATA mode, so sata is false. The Wi-Fi module sits in a separate M.2 Key-E slot.10Spec databasemaxmybuild.com/motherboards/msi-pro-b850m-a-wifiRead 14 October 2026M.2 heatsinks: slot 1 only.- M.2 slots
- 2
- PCIe 5.0 M.2 slots
- 1
Rear ports
- Rear ports
Type Version Count Max link rate (Gbps) USB-C USB 3.2 Gen 2 2 10 USB-A USB 3.2 Gen 2 3 10 USB-A USB 3.2 Gen 1 3 5 HDMI HDMI 2.1 1 Not available DisplayPort DisplayPort 1.4 1 Not available Ethernet (RJ45) Not available 1 5 3.5 mm audio Not available 3 Not available - Rear USB ports
- 8
- Rear USB-C ports
- 2
- Fastest rear USB port
- 10Gbps
- Thunderbolt
- Not available
Internal connectors
- Internal USB headers
Header Max data rate (Gbps) Headers Front ports served USB-C header 10 1 1 USB 3 header (19-pin) 5 1 2 USB 2.0 header (9-pin) 0.48 2 4 - Front USB-C header speed
- 10Gbps
Networking
- Ethernet controllers
- Realtek RTL81261Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026Specifications: 1x Realtek 8126 5Gbps LAN controller. Retailer listings and Geizhals add the suffix VB, which is left out.
- Ethernet ports
- 1
- Ethernet speed
- 5Gbps
- Wi-Fi standard
- Wi-Fi 71Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026Specifications: 802.11 a/b/g/n/ac/ax/be.
- Wi-Fi bands
- 2.4 GHz, 5 GHz, 6 GHz1Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026Specifications: 2.4GHz/5GHz/6GHz. 6 GHz may depend on each country's regulations.
- Max Wi-Fi channel width
- 160MHz1Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026Specifications: MU-MIMO TX/RX, 2.4GHz/5GHz/6GHz (160MHz) up to 2.9Gbps.
- Wi-Fi module
- Not available
Audio
- DAC chip
- Not available
Features
- Clear CMOS button (rear)
- Yes1Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026Specifications and page 23: Clear CMOS button on the rear panel. JBAT1 is a second jumper.
- Power button on the board
- Not available
- Pre-installed I/O shield
- Yes1Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026Special Features, EZ DIY: Pre-installed I/O Shield.
- Tool-free features
- Tool-free M.2 latch, Tool-free M.2 heatsink, PCIe slot release1Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026Special Features, EZ DIY: EZ M.2 Shield Frozr II (screwless M2_1 heatsink, pages 34 to 36), EZ M.2 Clip II (locks the SSD without a screw) and EZ PCIe Clip II (release for the graphics card). The Wi-Fi antenna cables are screwed on (page 26), so antenna_connector is not stored.
Measured
We could not find any of these 3 fields. Show them
- VRM temperature under CPU load
- Not available
- Power draw idle
- Not available
- Power draw CPU stress
- Not available
In the box
- In the box
- 1x Motherboard, 1x Quick installation guide, 1x European Union Regulatory Notices, 1x SATA cable, 1 x 1 to 2 EZ Conn-Cable (V1), 1x EZ Wi-Fi Antenna, 2x EZ M.2 Clip II, 1x EZ M.2 Clip II Remover1Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026Package Contents, page 22.
Links
- Product page
- www.msi.com/Motherboard/PRO-B850M-A-WIFI5Maker product pagemsi.com/Motherboard/PRO-B850M-A-WIFIRead 14 October 2026The URL comes from the job evidence and search results. msi.com blocks agents, so the page was not opened. Specifications were read from the user guide, the datasheet and MSI's regional stores.
- Spec sheet
- storage-asset.msi.com/datasheet/mb/in/PRO-B850M-A-WIFI.pdf2Maker spec sheet (PDF)storage-asset.msi.com/datasheet/mb/in/PRO-B850M-A-WIFI.pdfRead 14 October 2026One-page MSI datasheet for PRO B850M-A WIFI, generated 2025-10-31, on MSI's datasheet server.
- Manual
- static.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdf1Owner's manualstatic.buildcores.com/part-attachments/6ca91b70-bec1-4089-823a-42e63ffd6950_PROB850M-AWIFI_PROB850M-A_English.pdfRead 14 October 2026MSI User Guide for PRO B850M-A WIFI (66 pages), hosted by buildcores.com. msi.com blocks agents, so the maker's own copy was not opened.
- EPREL registration number
- Not available
Warranty
- Manufacturer warranty (source market)
- 3years3Maker product pagemy-store.msi.com/products/msi-pro-b850m-a-wifi-matx-motherboardRead 14 October 2026MSI Malaysia store: 3 years limited warranty. Geizhals says 3 years too.8Spec databasegeizhals.de/msi-pro-b850m-a-wifi-a3383558.htmlRead 14 October 2026Warranty 3 Jahre.
Compare with
Pick a motherboard to see both side by side. Differences are marked yellow.
Sources
We read 10 sources for this motherboard. The numbers match the markers in the sheet.
- Maker spec sheet (PDF)storage-asset.msi.com/datasheet/mb/in/PRO-B850M-A-WIFI.pdf
- Maker product pagemy-store.msi.com/products/msi-pro-b850m-a-wifi-matx-motherboard
- Maker product pagetw-store.msi.com/products/pro-b850m-a-wifi
- Maker product pagemsi.com/Motherboard/PRO-B850M-A-WIFI
- Spec databasegeizhals.de/msi-pro-b850m-a-wifi-a3383558.html
- Spec databasemaxmybuild.com/motherboards/msi-pro-b850m-a-wifi
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