PC parts / Motherboards
ASUSGaming motherboard
ROG STRIX B850-A GAMING WIFI
Released January 2025.4Press releasepress.asus.com/news/press-releases/asus-amd-x870e-b850-b840-rog-strix-tuf-prime-motherboardsRead 14 October 2026The press release gives no on-sale date for the B850 boards. A hands-on test appeared the same day and retail followed in January 2025. The month is approximate. Last checked 16 October 2026.
- CPU socket
- AM5
- Chipset
- AMD B850
- Form factor
- ATX
- M.2 slots
- 4
62 of 78 fields known.
At a glance
Ports
- USB-C USB 3.2 Gen 2x2
- USB-C USB 3.2 Gen 2
- 2 USB-A USB 3.2 Gen 2
- 4 USB-A USB 3.2 Gen 1
- 2 USB-A USB 2.0
- HDMI 2.1
- DisplayPort 1.4
- Ethernet (RJ45)
- 2 3.5 mm audio
- Optical S/PDIF
- USB-C header
- USB 3 header (19-pin)
- 2 USB 2.0 header (9-pin)
General
- Model numbers
- ROG STRIX B850-A GAMING WIFI, 90MB1J50-M0AAY0, 90MB1J50-M0EAY01Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026The page's order configuration id is 90MB1J50-M0AAY0. Paradigit lists 90MB1J50-M0EAY0 for the same board.11Retailer pageparadigit.ie/asus-rog-strix-b850-a-gaming-wifi/21754542/productRead 14 October 2026Paradigit lists product number manufacturer 90MB1J50-M0EAY0 for the board.
- GTIN / EAN
- 197105772670, 47113877726768Retailer pageamazon.com/dp/B0DPLP33YRRead 14 October 2026The Amazon US listing for ASIN B0DPLP33YR gives UPC 197105772670 and Mfr Part Number ROG STRIX B850-A GAMING WIFI.9Retailer pagescan.co.uk/products/asus-rog-strix-b850-a-gaming-wifiRead 14 October 2026Scan UK lists GTIN 4711387772676.10Spec databasebuildcores.com/products/Motherboard/xy81tonxw/ASUS-ROG-STRIX-B850-A-GAMING-WIFIRead 14 October 2026BuildCores lists UPC 197105772670 and 197105983472 and EAN 4711387772676. 197105983472 is not stored, since no page ties it to this model.
- Announced
- 6 January 20254Press releasepress.asus.com/news/press-releases/asus-amd-x870e-b850-b840-rog-strix-tuf-prime-motherboardsRead 14 October 2026ASUS press release of 2025-01-06 introduces the ROG Strix B850-A Gaming WiFi.
- Status
- Available8Retailer pageamazon.com/dp/B0DPLP33YRRead 14 October 2026The listing is in stock on 2026-10-14 at best sellers rank 3 in Computer Motherboards.10Spec databasebuildcores.com/products/Motherboard/xy81tonxw/ASUS-ROG-STRIX-B850-A-GAMING-WIFIRead 14 October 2026BuildCores shows US retailers in stock on 2026-10-14 (Amazon, Best Buy, Newegg, Walmart).
- 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
- CPU socket
- AM51Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026
- Chipset
- AMD B8501Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026
- Supported processors
- AMD Ryzen 9000 Series, AMD Ryzen 8000 Series, AMD Ryzen 7000 Series1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026AM5 for Ryzen 9000, 8000 and 7000 Series. The page refers to the ASUS download center for the CPU support list. Read on 2026-10-14.
Board
Front and side, drawn to scale.
- Form factor
- ATX1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026ATX form factor.
- Board dimensions
- Width244Height305mm(9.6 × 12 in)1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 202612 inch x 9.6 inch (30.5 cm x 24.4 cm).
- Back-connect design
- No3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_B850-A_GAMING_WIFI/E26438_ROG_STRIX_B850-A_GAMING_WIFI_EM_v3_WEB.pdfRead 14 October 2026The layout in chapter 1 shows the usual front-side power, fan and USB connectors. The board is not a back-connect design.10Spec databasebuildcores.com/products/Motherboard/xy81tonxw/ASUS-ROG-STRIX-B850-A-GAMING-WIFIRead 14 October 2026Back-Connect Connectors: No.
- RGB lighting on the board
- Yes2Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifiRead 14 October 2026The page describes subtle RGB lighting on the I/O shroud and ASUS Aura lighting.6Reviewchip.pl/2025/11/asus-rog-strix-b850-a-gaming-wifi-test-recenzja-opiniaRead 14 October 2026The review describes a lit ROG logo on the I/O shroud.
Power delivery
- Power stage layout
- 14+2+22Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifiRead 14 October 202614(80A)+2(80A)+2(80A) power stages: 14 Vcore, 2 SoC and 2 MISC.
- CPU core (Vcore) power stages
- 142Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifiRead 14 October 2026The VRM features 14+2+2 power stages.
- VRM controller
- Not available
Memory
- Memory type
- DDR51Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026
- Memory slots
- 41Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026
- Max memory speed (overclocked)
- 8,000MT/s1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026Up to 8000+ MT/s (OC) with Ryzen 9000, 8000 and 7000 Series. The Ryzen 9000 value is stored. The overview page image text also shows 8400+.
- CUDIMM support
- Not available
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 Source1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026Ryzen 9000 and 7000: 1 x PCIe 5.0 x16 slot. Ryzen 8000: the same slot runs PCIe 4.0 at x8 or x4. B850 chipset: 1 x PCIe 4.0 x16 slot at x4, which shares bandwidth with M.2_3. Stored with Ryzen 9000.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_B850-A_GAMING_WIFI/E26438_ROG_STRIX_B850-A_GAMING_WIFI_EM_v3_WEB.pdfRead 14 October 2026The layout shows PCIEX16(G5) and PCIEX16(G4) as the only two expansion slots.- 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 Shares lanes with M.2_1 5 4 CPU M.2 2280 No Yes Not available M.2_2 4 4 CPU M.2 22110 No Yes Not available M.2_3 4 4 Chipset M.2 2280 No Yes M.2_3 is disabled when the PCIEX16(G4) slot is used M.2_4 4 4 Chipset M.2 2280 No Yes Not available Source1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026Total 4 x M.2 (Key M). Ryzen 9000 and 7000: M.2_1 type 2242/2260/2280 PCIe 5.0 x4 and M.2_2 type 2280/22110 PCIe 4.0 x4. Ryzen 8000: M.2_1 runs PCIe 4.0 x4 and M.2_2 runs PCIe 4.0 x4 or x2. Chipset: M.2_3 and M.2_4 type 2280 PCIe 4.0 x4. The page lists no M.2 SATA support, so sata is false for every slot. M.2_3 is disabled while PCIEX16(G4) is in use.2Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifiRead 14 October 2026Overview: 4 x M.2 slots, 1 x 2280 PCIe 5.0 x4, 2 x 2280 PCIe 4.0 x4 and 1 x 22110 PCIe 4.0 x4. 4 x M.2 heatsinks, with every M.2 slot covered, plus an M.2 backplate.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_B850-A_GAMING_WIFI/E26438_ROG_STRIX_B850-A_GAMING_WIFI_EM_v3_WEB.pdfRead 14 October 2026The specification summary matches the page. M.2_3 shares bandwidth with PCIEX16(G4) and is disabled while that slot works. The manual lists M.2 types and PCIe modes only.- M.2 slots
- 4
- PCIe 5.0 M.2 slots
- 1
Rear ports
- Rear ports
Type Version Count Max link rate (Gbps) Power out (W) USB-C USB 3.2 Gen 2x2 1 20 Not available USB-C USB 3.2 Gen 2 1 10 15 USB-A USB 3.2 Gen 2 2 10 Not available USB-A USB 3.2 Gen 1 4 5 Not available USB-A USB 2.0 2 0.48 Not available HDMI HDMI 2.1 1 Not available Not available DisplayPort DisplayPort 1.4 1 Not available Not available Ethernet (RJ45) Not available 1 2.5 Not available 3.5 mm audio Not available 2 Not available Not available Optical S/PDIF Not available 1 Not available Not available - Rear USB ports
- 10
- Rear USB-C ports
- 2
- Fastest rear USB port
- 20Gbps
- 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 Source1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026Front USB (total 7 ports): 1 x USB 10Gbps connector (supports USB Type-C), 1 x USB 5Gbps header for 2 ports and 2 x USB 2.0 headers for 4 ports. The Thunderbolt (USB4) header is for an add-in card and is not listed.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_B850-A_GAMING_WIFI/E26438_ROG_STRIX_B850-A_GAMING_WIFI_EM_v3_WEB.pdfRead 14 October 2026Layout contents: 8. USB 10Gbps Type-C front panel connector, 9. USB 5Gbps header, 10. USB 2.0 header (two).- Front USB-C header speed
- 10Gbps
- RGB headers
- 03Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_B850-A_GAMING_WIFI/E26438_ROG_STRIX_B850-A_GAMING_WIFI_EM_v3_WEB.pdfRead 14 October 2026The internal connector list names only 3 x Addressable Gen2 headers and no 4-pin RGB header.6Reviewchip.pl/2025/11/asus-rog-strix-b850-a-gaming-wifi-test-recenzja-opiniaRead 14 October 2026The reviewer writes that the board has three ARGB headers and no RGB header.10Spec databasebuildcores.com/products/Motherboard/xy81tonxw/ASUS-ROG-STRIX-B850-A-GAMING-WIFIRead 14 October 2026RGB 12V Headers: 0 and ARGB 5V Headers: 3.
Networking
- Ethernet controllers
- Intel I2266Reviewchip.pl/2025/11/asus-rog-strix-b850-a-gaming-wifi-test-recenzja-opiniaRead 14 October 2026The review names an Intel I226-V 2.5 Gb Ethernet chip. ASUS writes only Intel 2.5Gb Ethernet. The -V suffix is dropped.
- Ethernet ports
- 1
- Ethernet speed
- 2.5Gbps
- Wi-Fi standard
- Wi-Fi 71Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 20262x2 Wi-Fi 7 (802.11be).
- Wi-Fi bands
- 2.4 GHz, 5 GHz, 6 GHz1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026Supports 2.4/5/6GHz frequency band. The 6 GHz band and bandwidth vary by country.
Audio
- DAC chip
- Not available
Features
- BIOS flashback
- Yes1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026BIOS FlashBack button on the back panel.
- Clear CMOS button (rear)
- Yes1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026Clear CMOS button on the back panel.
- Power button on the board
- Yes1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026Internal connectors, miscellaneous: 1 x Power button.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_B850-A_GAMING_WIFI/E26438_ROG_STRIX_B850-A_GAMING_WIFI_EM_v3_WEB.pdfRead 14 October 2026Layout item 14: Start button, which powers up the system.
- Dual BIOS
- Not available
- Pre-installed I/O shield
- Yes1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026ASUS EZ DIY list: Pre-mounted I/O shield.
- Tool-free features
- Tool-free M.2 latch, Tool-free M.2 heatsink, PCIe slot release, Push-on antenna connector1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026ASUS Q-Design: M.2 Q-Latch, M.2 Q-Release, M.2 Q-Slide, PCIe Slot Q-Release Slim and Q-Antenna.2Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifiRead 14 October 2026Q-Release lets the M.2 heatsink come off with a switch and no tiny screws. Q-Latch installs M.2 SSDs with one press. PCIe Slot Q-Release Slim unlocks the card by tilting it. Q-Antenna snaps the Wi-Fi antenna into place.
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
- 2 x SATA 6Gb/s cables, 1 x ASUS WiFi Q-Antenna, 1 x Cable ties package, 1 x M.2 Q-Latch package, 1 x M.2 Q-Slide package, 1 x ROG key chain, 1 x ROG Strix stickers, 4 x M.2 rubbers, 1 x Quick start guide1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026Accessories list on the specification page, the same as the manual's package contents.
Links
- Product page
- rog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi2Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifiRead 14 October 2026
- Spec sheet
- rog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/spec1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/specRead 14 October 2026
- Manual
- dlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_B850-A_GAMING_WIFI/E26438_ROG_STRIX_B850-A_GAMING_WIFI_EM_v3_WEB.pdf3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_B850-A_GAMING_WIFI/E26438_ROG_STRIX_B850-A_GAMING_WIFI_EM_v3_WEB.pdfRead 14 October 2026ASUS user guide E26438, Revised Edition v3, June 2025, from dlcdnets.asus.com.
- EPREL registration number
- Not available
Warranty
Compare with
Pick a motherboard to see both side by side. Differences are marked yellow.
Sources
We read 11 sources for this motherboard. The numbers match the markers in the sheet.
- Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi/spec
- Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-b850-a-gaming-wifi
- Maker product pageamd.com/en/products/processors/chipsets/am5.html
- Retailer pageamazon.com/dp/B0DPLP33YR
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