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Micro-ATX motherboard with back-connect layout, dark PCB and silver heatsinks

MSI

MSI PRO B850M-A WIFI PZ AMD motherboard

SKU CH-Q91Z-3V0FM MPN PRO B850M-A WIFI PZ

Micro-ATX AM5 board with back-connect layout, DDR5 to 8200 MT/s, PCIe 5.0 graphics slot, Gen5 M.2, 5G LAN and Wi-Fi 7

  • ProcessorRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Form factorMicro ATX
  • CPU socketAM5
  • Memory slot count4 × 288pin (DDR5)
  • Supported memory4x DDR5 UDIMM, Maximum Memory Capacity 256 GB Memory Support
  • Supports Ryzen 7000, 8000 and 9000 series processors via AM5 socket
  • DDR5 memory overclocking to 8200+ MT/s with Memory Boost technology
  • PCIe 5.0 x16 slot and Gen5 M.2 for fastest GPU and storage
  • 5G LAN plus Wi-Fi 7 with 6 GHz band for high-speed networking
  • Back-connect design moves power and fan headers to rear for cleaner builds

Back-connect mATX for Ryzen 7000/8000/9000

The PRO B850M-A WIFI PZ is a micro-ATX motherboard built on the AMD B850 chipset for AMD Ryzen 7000, 8000 and 9000 series processors. Its back-connect design relocates power, fan and header pins to the rear of the board for a cleaner front view and simpler cable routing. Four DDR5 slots support up to 256 GB of memory. Integrated Wi-Fi 7 and 5 Gbps LAN handle networking.

Frozr heatsinks with 7 W/mK pads

An extended heatsink, MOSFET thermal pads rated for 7 W/mK and additional choke pads form the Frozr Guard cooling array. The direct 8+2+1 power system uses 60 A SPS stages fed by 8+4-pin CPU connectors. A six-layer PCB with 2 oz thickened copper helps dissipate heat during sustained loads. The layout keeps thermals in check without adding acoustic noise.

PCIe 5.0 graphics, Gen5 M.2 and four SATA ports

The primary PCIe 5.0 x16 slot and one M.2_1 slot running PCIe 5.0 x4 come directly from the CPU. A second M.2_2 slot provides PCIe 4.0 x4. Four SATA 6 Gbps ports remain available for additional storage. Two PCIe 3.0 x1 slots and two PCIe 3.0 x1 slots from the chipset handle add-in cards. The pre-installed Wi-Fi 7 module occupies the M.2 Key-E slot and supports 2.4, 5 and 6 GHz bands.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $175.99
Cheaper than about 57% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameMSI
Model namePRO B850M-A WIFI PZ
Processor
ProcessorRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
CPU socketAM5
ChipsetAMD B850
Memory
Memory slot count4 × 288pin (DDR5)
Supported memory4x DDR5 UDIMM, Maximum Memory Capacity 256 GB
Memory Support DDR5 8200–5600 (OC) MT/s / 5600–4800 (JEDEC) MT/s
Ryzen™ 9000 Series Processors max. overclocking frequency:
• 1DPC 1R Max speed up to 8200+ MT/s
• 1DPC 2R Max speed up to 6400+ MT/s
• 2DPC 1R Max speed up to 6400+ MT/s
• 2DPC 2R Max speed up to 6000+ MT/s
Max supported RAM256 GB
Storage
SATA ports4 x SATA 6Gb/s
M.2 slots2x M.2
M.2_1 Source (From CPU) supports up to PCIe 5.0 x4 , supports 2280/2260 devices
M.2_2 Source (From CPU) supports up to PCIe 4.0 x4 , supports 2280/2260 devices
4x SATA 6G
M2_1 slot
• Supports up to PCIe 5.0 x4 (For Ryzen™ 9000/ 7000 Series processors)
• Supports up to PCIe 4.0 x4 (For Ryzen™ 8000 Series processors)
M2_2 slot
• Supports up to PCIe 4.0 x4
• Supports up to PCIe 4.0 x2 (For Ryzen™ 8500/ 8300 Series processors)
*Please refer to the manual for M.2 SSD heatsink restrictions.
Audio & video
Audio chipRealtek® ALC897
Sound channels7.1-Channel High Definition Audio
Connectivity
Ethernet controllerRealtek® 8126 5G LAN
Maximum network speed5 Gbit/s
Wi-Fi standardWi-Fi 7
The Wireless module is pre-installed in the M.2 (Key-E) slot
Supports MU-MIMO TX/RX, 2.4 GHz/ 5 GHz/ 6 GHz* (160 MHz) up to 2.9 Gbit/s
Supports 802.11 a/ b/ g/ n/ ac/ ax/ be
Bluetooth supportSupports Bluetooth® 5.4**, MLO, 4KQAM
Ports & slots
PCIe 5.0 x16 slots4x PCI-E x16 slot
PCI_E1 Gen PCIe 5.0 supports up to x16 (From CPU)
PCI_E2 Gen PCIe 3.0 supports up to x1 (From Chipset)
PCI_E3 Gen PCIe 3.0 supports up to x1 (From Chipset)
PCI_E4 Gen PCIe 4.0 supports up to x4 (From Chipset)
PCI_E1 slot
• Supports PCIe 5.0 x16 (For Ryzen™ 9000/ 7000 Series processors)
• Supports PCIe 4.0 x8 (For Ryzen™ 8700/ 8600/ 8400 Series processors)
• Supports PCIe 4.0 x4 (For Ryzen™ 8500/ 8300 Series processor)
PCIe x4 slots1 x PCIe 4.0 x4 slot
PCIe x1 slots2 x PCIe 3.0 x1 slots
Rear panel ports1 x Clear CMOS Button / 1 x DisplayPort / 1 x Flash BIOS Button / 1 x HDMI / 2 x Antenna Bracket / 2 x USB 3.1 Gen 1 Type-A / 2 x USB 3.1 Gen 2 Type-A / 2 x USB 3.2 Gen 2 Type-C / 3 x Audio Jacks
Onboard USB headers4x USB 2.0 (Front)
2x USB 5 Gbit/s Type A (Front)
1x USB 10 Gbit/s Type C (Front)
Size & build
Form factorMicro ATX
Width and length243.84mmx243.84 mm
Shipping weight1.63 kg
Package size292 × 281 × 76 mm
Compatibility
Windows 11 supportSupport for Windows® 11 64-bit

Questions about this item

How do I install the CPU power cables on the back-connect layout, and which header do builders often plug into the wrong spot?

Route both the 8-pin and 4-pin CPU power cables to the rear-mounted headers before seating the board; the 4-pin auxiliary header sits beside the main 8-pin and is frequently missed, leaving the 60 A SPS rails under-fed.

Which onboard component will need thermal-pad attention after a few years of heavy loads?

The MOSFET pads rated at 7 W/mK and the choke pads under the extended heatsink are the first to dry out; replace them with 1 mm pads of equal conductivity when VRM temperatures climb.

What sustained-write ceiling appears first on the primary M.2 slot during long transfers?

The PCIe 5.0 x4 link from the CPU caps sequential writes at the drive’s controller limit; the board adds no extra bottleneck beyond the 5.0 x4 lane budget.

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