MSI MAG B850 TOMAHAWK MAX WIFIAM5 · ATX · DDR5 · board-only configuration · MSI global specification- M.2 storage positions
- 4This one: 3
MOTHERBOARDS
ASUS PRIME B850-PLUS WIFI
AM5 · ATX · US specification
- CPU socket
- AM5
- Chipset
- AMD B850
- Form factor
- ATX; 305 × 244 mm
An ATX AM5 motherboard with AMD B850: four DDR5 slots rated up to DDR5-8000+ (OC), a PCIe 5.0 x16 graphics slot plus three chipset slots, three M.2 slots (one PCIe 5.0 x4), Realtek 2.5 Gb Ethernet and Wi-Fi 6E.
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THE ACTUAL PRODUCT
Compare with MSI MAG B850 TOMAHAWK MAX WIFI
Specifications checked 27 Sept 2026Manufacturer specifications, not a hands-on test.
The nearest checked motherboards by key specifications, with what differs from the ASUS PRIME B850-PLUS WIFI. The first matches the Compare button above.
MSI MAG B850 TOMAHAWK MAX WIFIAM5 · ATX · DDR5 · board-only configuration · MSI global specification
ASUS ROG STRIX B850-F GAMING WIFI90MB1J70-M0MAY0 · AM5 · ATX · ASUS UK specification- M.2 storage positions
- 4This one: 3
- SATA storage ports
- 2This one: 4
ASUS ROG STRIX B850-A GAMING WIFI90MB1J50-M0MAY0 · AM5 · ATX · ASUS UK specification- M.2 storage positions
- 4This one: 3
- SATA storage ports
- 2This one: 4
Key strengths
Four expansion slots (PCIe 5.0 x16, PCIe 4.0 x4-mode and two PCIe 3.0 x1-mode) and a PCIe 5.0 x4 M.2 slot among three M.2 slots.
Rear DisplayPort and HDMI outputs, four 10 Gb/s USB ports including a USB-C, a BIOS FlashBack button, and Thunderbolt (USB4) and SPI TPM headers.
Accepts ECC as well as non-ECC unbuffered DDR5 up to 8000+ MT/s (OC), supports CPUs up to 170 W, and ASUS lists Windows 10 64-bit as well as Windows 11.
Before you buy
Using either PCIe 3.0 slot disables two of the four SATA ports, and the chipset M.2_3 slot is limited to PCIe 4.0 x2.
Wi-Fi 6E and Bluetooth 5.3 rather than Wi-Fi 7, eight rear USB ports with no USB4, a back-panel list with no Clear CMOS button (ASUS lists an internal Clear CMOS header), and an unnamed Realtek audio codec.
Works with
Products in this catalogue that list the same socket or memory type as the ASUS PRIME B850-PLUS WIFI. A shared socket or memory type is necessary but not sufficient: check the exact CPU and memory support lists, and the BIOS version, before buying.
- 19 AM5 processorsSocket AM5 on both, from cited specifications
- 50 DDR5 memory kitsMemory type DDR5 on both, from cited specifications
Every specification. With its source.
Full specifications
Exact configuration: PRIME B850-PLUS WIFI · AM5 · ATX · ASUS US specification
36 specifications in 9 groups. Values are manufacturer specifications unless a row says “Measured result” or “Calculated from cited specifications”.
Platform & board
4 items
- CPU socket
- AM5Source
- Chipset
- AMD B850Source
- Form factor
- ATX; 305 × 244 mm
Check case mounting positions and connector clearance.
Source - Specification market
- ASUS US documentation
The ASUS UK product page lists the same model; its UK specification page returned no specification text to a plain request on 27 September 2026. UK and US buying links are searches, not proof of stock, identical regional wireless modules, bundles or warranty.
Source
Memory
4 items
- DIMM slots
- 4
Physical DDR5 module positions; this count is not a guarantee of capacity or profile speed.
Source - Maximum listed memory
- 256 GB
Manufacturer capacity ceiling; check CPU support, BIOS and the validated DIMM population.
Source - Memory type, slots and limit
- 4 DDR5 DIMM slots; dual channel; up to 256 GB; up to DDR5-8000+ (OC); AMD EXPO; ECC and non-ECC unbuffered
ASUS lists up to 8000+ MT/s (OC) with Ryzen 9000, 8000 and 7000 processors and AEMP. · Supported capacity, module population and profile speeds depend on the exact CPU, installed BIOS and validated memory kit. Profile support does not guarantee an overclock.
Source - Listed memory overclocking profiles
- Ryzen 9000, 8000, 7000: up to 8000+ MT/s (OC)
These are manufacturer-listed overclocking configurations, not guaranteed stock transfer rates or tested performance. CPU family and DIMM layout remain material.
Source
Expansion slots
1 item
- Expansion slots and electrical links
- 1 × PCIe 5.0 x16; 1 × PCIe 4.0 x16 (x4 mode); 2 × PCIe 3.0 x16 (x1 mode)
The PCIe 5.0 x16 slot is listed under the Ryzen processor; the other three under the B850 chipset. · With Ryzen 8000 the first slot runs PCIe 4.0 x8/x4. Using either PCIe 3.0 slot disables SATA6G_1/2. See ASUS's PCIe bifurcation table.
Source
Storage
7 items
- M.2 storage positions
- 3
M.2_3 is a PCIe 4.0 x2 slot. Ryzen 8000 processors change the CPU-attached M.2 links.
Source - SATA storage ports
- 4
SATA 6 Gb/s. SATA6G_1/2 are disabled when either PCIEX16(G3) slot is in use.
Source - Storage interfaces
- 1 × M.2 PCIe 5.0 x4; 1 × M.2 PCIe 4.0 x4; 1 × M.2 PCIe 4.0 x2; 4 × SATA 6 Gb/s
M.2_1 (PCIe 5.0 x4) and M.2_2 (PCIe 4.0 x4) are listed under the Ryzen processor and accept 2280 drives; M.2_3 (PCIe 4.0 x2) is listed under the B850 chipset and accepts 2242/2260/2280/22110. · SATA6G_1/2 are disabled when either PCIe 3.0 x1-mode slot is in use. With Ryzen 8000, M.2_1 runs PCIe 4.0 x4 and M.2_2 PCIe 4.0 x4/x2.
Source - Expansion/storage lane sharing
- SATA6G_1/2 are disabled when PCIEX16(G3)_1 or PCIEX16(G3)_2 is in use
Read the simultaneous-use restriction rather than assuming all four SATA ports stay available with every slot populated.
Source - SATA RAID modes
- Not listed by the manufacturer
ASUS lists AMD RAIDXpert2 levels per CPU family (Ryzen 9000: 0/1/5/10; 8000: 0/1; 7000: 0/1/10) without stating which apply to SATA versus NVMe devices.
Source - NVMe RAID modes
- Not listed by the manufacturer
ASUS lists AMD RAIDXpert2 levels per CPU family (Ryzen 9000: 0/1/5/10; 8000: 0/1; 7000: 0/1/10) without stating which apply to NVMe versus SATA devices.
Source - M.2 drive installation aids
- M.2 screw packages (3)
ASUS lists three screw packages for M.2 SSDs and a flexible M.2 heatsink, and no tool-free M.2 latch for this board.
Source
USB & rear connections
5 items
- Rear connections
- 4 × USB 10 Gb/s (3 Type-A + 1 Type-C); 2 × USB 5 Gb/s (Type-A); 2 × USB 2.0 (Type-A); 1 × DisplayPort; 1 × HDMI; Wi-Fi module; 1 × Realtek 2.5 Gb Ethernet; 3 × audio jacks; BIOS FlashBack button
Connector count and listed modes describe the rear panel. Display output depends on the CPU's integrated graphics.
Source - Internal USB connections
- 1 × USB 5 Gb/s (Type-C); 2 × USB 5 Gb/s (1 header); 6 × USB 2.0 (3 headers)
Internal headers need compatible case ports or accessories. ASUS lists USB Type-C power delivery output of max. 5 V/3 A.
Source - Integrated-graphics display connections
- DisplayPort 1.4: up to 8K 30 Hz; HDMI 2.1: 4K 60 Hz
Requires a processor with integrated graphics; see AMD CPU specifications. Not measured display performance.
Source - Rear USB4 support
- No
ASUS's complete rear USB list (8 ports) has no USB4 port. The board has a Thunderbolt (USB4) header for a compatible add-in card.
Source - Thunderbolt (USB4) add-in card header
- Yes
A header for a compatible Thunderbolt/USB4 add-in card; no USB4 port is built into the rear panel.
Source
Networking
4 items
- Network interfaces
- Realtek 2.5 Gb Ethernet; Wi-Fi 6E; Bluetooth 5.3
ASUS says the Wi-Fi 6E 6 GHz band is supported only in Windows 11 or later and depends on local regulations; Bluetooth versions may vary by module.
Source - Wired Ethernet
- Realtek 2.5 Gb Ethernet
Link-rate capability; real throughput depends on the connected network, cabling and workload. ASUS also lists ASUS LANGuard.
Source - Included Wi-Fi
- Yes
2x2 Wi-Fi 6E (not Wi-Fi 7). The 6 GHz band is supported only in Windows 11 or later and depends on local regulations.
Source - Listed Bluetooth version
- 5.3
The manufacturer notes that the Bluetooth version can depend on the installed wireless module.
Source
Audio
1 item
- Audio hardware
- Realtek 7.1-channel HD audio codec (model not stated); up to 24-bit/192 kHz playback
ASUS says 7.1 output needs a chassis HD audio front-panel module. A codec description is not an independent sound-quality measurement.
Source
Power, cooling & lighting
4 items
- Motherboard power connections
- 1 × 24-pin Main Power connector; 1 × 8-pin +12V CPU Power connector; 1 × 4-pin +12V CPU Power connector
Check the complete connector list and the PSU cable type.
Source - Fan and pump headers
- 1 CPU; 1 CPU OPT; 1 AIO pump; 4 chassis fan headers (all 4-pin)
Header counts do not specify electrical current limits.
Source - Lighting headers
- 3 addressable RGB Gen 2 headers
Check the manual for connector voltage and LED limits before connecting lighting.
Source - Advertised voltage regulation
- 8 + 2 + 1 phase digital power design (DIGI+ VRM)
ASUS does not publish per-stage current ratings for this board on the checked pages. Not a measured VRM temperature or overclocking result.
BIOS, software & diagnostics
6 items
- CPU support / BIOS source
- AMD Ryzen 9000 / 8000 / 7000 Series
ASUS lists support for CPUs up to 170 W. Check ASUS's exact CPU support list and its required BIOS; family support does not confirm the firmware installed on a retail board.
Source - Firmware storage
- 256 Mb Flash ROM, UEFI AMI BIOS
Flash-ROM capacity does not identify the BIOS version installed on a retail board.
Source - Listed operating systems
- Windows 11; Windows 10 64-bit
Individual features and drivers can have newer operating-system requirements; ASUS limits Wi-Fi 6E 6 GHz operation to Windows 11 or later.
Source - Rear Flash BIOS button
- Yes
ASUS BIOS FlashBack button. Use the exact model firmware and follow ASUS's BIOS FlashBack instructions.
Source - Rear Clear CMOS button
- Not listed by the manufacturer
ASUS's complete back-panel list has no Clear CMOS button; it lists an internal Clear CMOS header instead. Omission is recorded as unconfirmed rather than a sourced absence.
Source - Diagnostic indicators
- Q-LED CoreSource
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