PC parts / Motherboards
ASRockMainstream motherboard
B850M-X R2.0
Released May 2025.2Retailer pagecomputerorbit.com/products/asrock-b850m-x-r2-0-micro-atx-am5-motherboardRead 15 October 2026The shop's product feed shows this listing created on 2025-05-28 in the UK, and the Wi-Fi board on 2025-05-22. ASRock's manual for both boards is dated February 2025 and the Wi-Fi board went on sale in Japan on 2025-04-04. The date for the board without Wi-Fi is approximate. Last checked 16 October 2026.
- CPU socket
- AM5
- Chipset
- AMD B850
- Form factor
- Micro-ATX
- M.2 slots
- 2
54 of 78 fields known.
At a glance
Ports
- USB-C USB 3.2 Gen 1
- 3 USB-A USB 3.2 Gen 1
- 2 USB-A USB 2.0
- 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
- Series
- Not available
- Model numbers
- B850M-X R2.0, 90-MXBSG0-A0UAYZ1Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026Cover and chapter 1 name the B850M-X R2.0. The part number 90-MXBSG0-A0UAYZ is on BuildCores, Paradigit and ComputerG. The Wi-Fi board is a separate model, 90-MXBSH0-A0UAYZ.4Retailer pageparadigit.ie/asrock-b850m-x-r2-0/21812982/productRead 15 October 2026Manufacturer part number 90-MXBSG0-A0UAYZ. The page lists 3 M.2 slots in its highlights and 1 in its table, which fits neither the manual nor the maker's text, so it is not used for slots.6Retailer pagecomputerg.shop/it/shop/asrock-b850m-x-r2-0-b850-am5-90-mxbsg0-a0uayz-42489Read 15 October 2026Part number 90-MXBSG0-A0UAYZ.7Spec databasebuildcores.com/products/Motherboard/4aue7wofw/ASRock-B850-M-X-R2.0-DDR5-Micro-ATXRead 15 October 2026Retailer part number 90-MXBSG0-A0UAYZ. The page also shows a UPC 4711581490765 that other shops attach to the Wi-Fi board, so it is not stored. Its Wi-Fi 6E row also belongs to the Wi-Fi board.
- GTIN / EAN
- 47115814907582Retailer pagecomputerorbit.com/products/asrock-b850m-x-r2-0-micro-atx-am5-motherboardRead 15 October 2026Shop feed barcode 4711581490758 for SKU B850M-X R2.0. The Wi-Fi board has 4711581490765.5Retailer pageox.ee/en/product/3162912Read 15 October 2026EAN 4711581490758. The Computer Orbit feed and the ComputerG listing show the same number.6Retailer pagecomputerg.shop/it/shop/asrock-b850m-x-r2-0-b850-am5-90-mxbsg0-a0uayz-42489Read 15 October 2026Barcode 4711581490758.
- Announced
- Not available
- 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 manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026Section 1.2: AMD Socket AM5 Ryzen 9000, 8000 and 7000 Series Processors. Slot availability depends on the CPU. Read on 2026-10-15.
Board
Front and side, drawn to scale.
- Form factor
- Micro-ATX1Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026Section 1.2: Micro ATX Form Factor.
- Board dimensions
- Width226Height244mm(8.9 × 9.6 in)2Retailer pagecomputerorbit.com/products/asrock-b850m-x-r2-0-micro-atx-am5-motherboardRead 15 October 2026Shop copy of ASRock's spec: Micro ATX Form Factor 9.6-in x 8.9-in, 24.4 cm x 22.6 cm. The 244 mm side runs along the rear I/O edge, as the field help says for Micro ATX, so it is stored as the height. The shorter 226 mm side is the width.3Retailer pageavadirect.com/B850M-X-R2-0-AMD-B850-Chipset-AM5-microATX-Motherboard/Product/19612206Read 15 October 2026Spec text: Micro ATX Form Factor 9.6-in x 8.9-in, 24.4 cm x 22.6 cm.4Retailer pageparadigit.ie/asrock-b850m-x-r2-0/21812982/productRead 15 October 2026Width 244 mm and depth 226 mm in the spec table. The shop calls the longer side the width. It runs along the rear I/O edge.6Retailer pagecomputerg.shop/it/shop/asrock-b850m-x-r2-0-b850-am5-90-mxbsg0-a0uayz-42489Read 15 October 2026Width 244 mm and depth 226 mm. The shop calls the longer side the width.8Press articlegdm.or.jp/crew/2025/0404/581769Read 15 October 2026Micro-ATX (244 x 226 mm), for the Wi-Fi board.
- PCB layers
- 62Retailer pagecomputerorbit.com/products/asrock-b850m-x-r2-0-micro-atx-am5-motherboardRead 15 October 2026Shop copy of ASRock's text: the 6 Layer PCB provides stable signal traces and power shapes.4Retailer pageparadigit.ie/asrock-b850m-x-r2-0/21812982/productRead 15 October 2026Text: the 6 Layer PCB provides stable signal traces and power shapes.
- RGB lighting on the board
- No2Retailer pagecomputerorbit.com/products/asrock-b850m-x-r2-0-micro-atx-am5-motherboardRead 15 October 2026The text names only onboard RGB and addressable RGB headers for external devices. It names no lighting on the board.7Spec databasebuildcores.com/products/Motherboard/4aue7wofw/ASRock-B850-M-X-R2.0-DDR5-Micro-ATXRead 15 October 2026Lighting: None. The headers are for external devices.
Power delivery
- Power stage layout
- 6+1+12Retailer pagecomputerorbit.com/products/asrock-b850m-x-r2-0-micro-atx-am5-motherboardRead 15 October 2026Shop copy of ASRock's product page: 6+1+1 Phase Power Design, Dr.MOS for VCore. The page gives no current rating and no controller.3Retailer pageavadirect.com/B850M-X-R2-0-AMD-B850-Chipset-AM5-microATX-Motherboard/Product/19612206Read 15 October 2026Spec text: 6+1+1 Phase Power Design, Dr.MOS for VCore.8Press articlegdm.or.jp/crew/2025/0404/581769Read 15 October 20266+1+1 phases, Dr.MOS for VCore, for the Wi-Fi board.
- CPU core (Vcore) power stages
- 62Retailer pagecomputerorbit.com/products/asrock-b850m-x-r2-0-micro-atx-am5-motherboardRead 15 October 2026The first number of 6+1+1 is the Vcore rail, built with Dr.MOS power stages.
- Vcore power stage rating
- Not available
- VRM controller
- Not available
Memory
- Memory type
- DDR51Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026Section 1.2: Dual Channel DDR5.
- Max memory
- 128GB1Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026Section 1.2: max. capacity of system memory 128GB.
- Max memory speed (overclocked)
- 8,200MT/s1Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026Section 1.2: DDR5 ECC/non-ECC un-buffered memory up to 8200+(OC). The manual names no CPU family or module setup. It refers to the Memory Support List on the maker's website.
- ECC memory
- Yes1Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026Section 1.2: supports DDR5 ECC/non-ECC un-buffered memory. The manual does not say whether ECC is active with each CPU. BuildCores also lists ECC support as yes.7Spec databasebuildcores.com/products/Motherboard/4aue7wofw/ASRock-B850-M-X-R2.0-DDR5-Micro-ATXRead 15 October 2026ECC Support: Yes.
- 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 PCIe x1 1 4 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 - 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 1 1 5 USB-A USB 3.2 Gen 1 3 5 USB-A USB 2.0 2 0.48 HDMI HDMI 2.1 1 Not available DisplayPort DisplayPort 1.4 1 Not available Ethernet (RJ45) Not available 1 2.5 3.5 mm audio Not available 3 Not available - Rear USB ports
- 6
- Rear USB-C ports
- 1
- Fastest rear USB port
- 5Gbps
- Thunderbolt
- Not available
Internal connectors
- Internal USB headers
Header Max data rate (Gbps) Headers Front ports served USB-C header 5 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
- 5Gbps
Networking
- Ethernet controllers
- Realtek RTL81251Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026Section 1.2: 2.5 Gigabit LAN, Dragon RTL8125BG. The suffix BG is left out.
- Ethernet ports
- 1
- Ethernet speed
- 2.5Gbps
- Wi-Fi standard
- Not available
- Wi-Fi bands
- Not available
- Max Wi-Fi channel width
- Not available
- Wi-Fi module
- Not available
- Bluetooth
- Not available
Audio
- Audio codec
- Realtek ALC8971Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026Section 1.2: 7.1 CH HD Audio, Realtek ALC897 Audio Codec.
- DAC chip
- Not available
Features
- Clear CMOS button (rear)
- No1Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026The layout lists a Clear CMOS jumper (CLRCMOS1). The only rear panel button is BIOS Flashback. BuildCores lists Clear CMOS Button: No.7Spec databasebuildcores.com/products/Motherboard/4aue7wofw/ASRock-B850-M-X-R2.0-DDR5-Micro-ATXRead 15 October 2026Clear CMOS Button: No.
- Power button on the board
- No1Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026Section 2.14 says the only smart switch is the BIOS Flashback button. The layout lists no power or reset button.
- Pre-installed I/O shield
- No1Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026Section 1.1 package contents lists 1 x I/O Shield as a loose item, and section 2.5 is a guide to installing the I/O panel shield.
- Tool-free features
- Tool-free M.2 latch1Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026The install guides for M2_1 and M2_2 use a nut lock that is turned clockwise to lock a 2280 module in place without a screw. The M2_1 heatsink needs a screwdriver and is not tool-free. The manual names no PCIe release button.
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
- 1 x I/O Shield, 2 x Serial ATA (SATA) Data Cables, 1 x Screw for M.2 Socket1Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026Section 1.1 package contents: 1 x I/O Shield, 2 x Serial ATA (SATA) Data Cables (Optional) and 1 x Screw for M.2 Socket (Optional) for the B850M-X R2.0, without the board. The two antennas listed are for the Wi-Fi board and are left out.2Retailer pagecomputerorbit.com/products/asrock-b850m-x-r2-0-micro-atx-am5-motherboardRead 15 October 2026Accessories: 1 x I/O Shield, 2 x SATA Data Cables, 1 x Screw for M.2 Socket.
Links
- Product page
- www.asrock.com/MB/AMD/B850M-X%20R2.0/index.asp10Maker product pageasrock.com/MB/AMD/B850M-X%20R2.0/index.aspRead 15 October 2026The page returned a bot check, so it was not read and the check was not worked around. Its address is the one in the job brief. No value comes from it.
- Spec sheet
- Not available
- Manual
- download.asrock.com/Manual/B850M-X%20R2.0.pdf1Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdfRead 15 October 2026ASRock manual for the B850M-X WiFi R2.0 and the B850M-X R2.0, 72 pages, Version 1.0, published February 2025. The cover says Micro ATX. Items marked B850M-X WiFi R2.0 are not used. asrock.com sits behind a bot check, so the maker's product page was not opened.
- EPREL registration number
- Not available
Warranty
- Manufacturer warranty (source market)
- 3years5Retailer pageox.ee/en/product/3162912Read 15 October 2026Warranty: 36 months. The market is Estonia. Arvutitark also lists 36 months.
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.
- Owner's manualdownload.asrock.com/Manual/B850M-X%20R2.0.pdf
- Retailer pageparadigit.ie/asrock-b850m-x-r2-0/21812982/product
- Retailer pageox.ee/en/product/3162912
- Press articlegdm.or.jp/crew/2025/0404/581769
- Maker product pageamd.com/en/products/processors/chipsets/am5.html
- Maker product pageasrock.com/MB/AMD/B850M-X%20R2.0/index.asp
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