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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

  • CPU Socket TypeAM5
  • CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Memory Standard4x DDR5 UDIMM, Maximum Memory Capacity 256GB Memory Support
  • Maximum Memory Supported256GB
  • 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.

Najważniejsze cechy

  • 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

Specyfikacja

BrandMSI
ModelPRO B850M-A WIFI PZ
CPU Socket TypeAM5
CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Memory Standard4x DDR5 UDIMM, Maximum Memory Capacity 256GB
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
Maximum Memory Supported256GB
Channel SupportedSupports AMD POR Speed and JEDEC Speed
Supports Memory Overclocking and AMD EXPOTM
Supports Dual-Channel mode
Supports Non-ECC, Un-buffered memory
Supports CUDIMM, Clock Driver bypass mode only*
Memory Feature8200+ MT/s (OC)
PCI Express 5.0 x164x 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)
PCI Express x41 x PCIe 4.0 x4 slot
PCI Express x12 x PCIe 3.0 x1 slots
Serial ATA (SATA)4 x SATA 6Gb/s
M.22x 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 ChipsetRealtek® ALC897
Audio Channels7.1-Channel High Definition Audio
LAN ChipsetRealtek® 8126 5G LAN
Max LAN Speed5Gbps
Wireless LANWi-Fi 7
The Wireless module is pre-installed in the M.2 (Key-E) slot
Supports MU-MIMO TX/RX, 2.4GHz/ 5GHz/ 6GHz* (160MHz) up to 2.9Gbps
Supports 802.11 a/ b/ g/ n/ ac/ ax/ be
BluetoothSupports Bluetooth® 5.4**, MLO, 4KQAM
Back I/O 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 USB4x USB 2.0 (Front)
2x USB 5Gbps Type A (Front)
1x USB 10Gbps Type C (Front)
Other Connectors1x Power Connector(ATX_PWR)
2x Power Connector(CPU_PWR)
1x Power Connector(PCIE_PWR 8pin)
1x CPU Fan
1x Combo Fan (Pump_Sys Fan)
3x System Fan
2x Front Panel (JFP)
1x Chassis Intrusion (JCI)
1x Front Audio (JAUD)
1x Com Port (JCOM)
1x Tuning Controller connector(JDASH)
3x Addressable V2 RGB LED connector (JARGB_V2)
1x RGB LED connector(JRGB)
1x TPM pin header(Support TPM 2.0)
Form FactorMicro ATX
Dimensions (W x L)243.84mmx243.84mm
Windows 11Support for Windows® 11 64-bit
FeaturesMSI motherboards are designed with advanced hardware and technology, well-supporting the demanding computing usage of gaming and AI. Moreover, we also introduce AI to MSI Center and BIOS, making everything more effortless than before.
4x EZ Debug LED
1x EZ Memory Detection LED
Supports RAID 0 and RAID 1 for M.2 NVMe storage devices
Supports RAID 0, RAID 1, and RAID 10 for SATA storage devices
Back-Connect Design
The PRO B850M-A WIFI PZ features a back-connect design, which relocates the motherboard power, CPU power, fan pins, SATA, and other interfaces to the back of the motherboard.
Waga przesyłki1.63 kg
Wymiary opakowania292 × 281 × 76 mm

Pytania dotyczące tego produktu

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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