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Rectangular green circuit board, silver CPU socket, four black memory slots, multiple silver expansion slots, rear I/O shield with

ASRock

ASRock B850M Pro-A AMD motherboard AM5 Micro ATX

SKU CH-ZVFQ-NSE2F MPN B850M Pro-A

Micro-ATX AM5 board with four DDR5 slots up to 256 GB, one PCIe 5.0 x16, one PCIe 4.0 x4, one Gen5 M.2 and two Gen4 M.2 slots, four SATA 6 Gb/s, 7.1-channel audio and Dragon RTL8125BG LAN

  • CPU Socket TypeAM5
  • CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Memory StandardUp to 8000+(OC)
  • Maximum Memory Supported256GB

Option B850M Pro-A

Les versions barrées existent, mais ne sont pas disponibles ici.

  • Supports Ryzen 9000, 8000 and 7000 series processors on AM5 socket
  • 8+2+1 phase Dr.MOS power design delivers stable CPU current
  • Four DDR5 slots enable up to 256 GB dual-channel memory
  • One PCIe 5.0 x16 and one PCIe 4.0 x4 expansion slots
  • One Gen5 M.2 and two Gen4 M.2 sockets plus four SATA ports

AM5 Micro ATX for Ryzen 7000 to 9000

The ASRock B850M Pro-A is a Micro ATX motherboard built on the AMD B850 chipset for socket AM5 processors. It accepts Ryzen 7000, 8000 and 9000 series CPUs and provides four DDR5 DIMM slots with dual-channel support up to 256 GB. An 8+2+1 phase Dr.MOS power design and a six-layer PCB deliver stable voltage regulation for daily workloads and moderate overclocking.

Suits compact builds needing PCIe 5.0 graphics and

This board fits users who want a smaller chassis without sacrificing a full-length PCIe 5.0 x16 slot or a CPU-attached M.2 socket running at Gen5x4 speeds. It also offers two chipset Gen4x4 M.2 slots, four SATA 6 Gb/s ports and 7.1-channel Realtek ALC897 audio. Builders requiring more than two M.2 drives directly from the CPU or additional PCIe expansion slots should consider larger ATX models.

Single CPU-attached PCIe 5.0 M.2 socket at 128 Gb/s

The primary M.2 socket (M2_1) connects directly to the Ryzen CPU and operates at PCIe 5.0 x4, providing up to 128 Gb/s bandwidth for a 2280 NVMe drive. The two chipset M.2 sockets run at PCIe 4.0 x4 (64 Gb/s each). This topology decides whether your fastest system drive gets the full Gen5 link or must share the chipset pool.

Points forts

  • Supports Ryzen 9000, 8000 and 7000 series processors on AM5 socket
  • 8+2+1 phase Dr.MOS power design delivers stable CPU current
  • Four DDR5 slots enable up to 256 GB dual-channel memory
  • One PCIe 5.0 x16 and one PCIe 4.0 x4 expansion slots
  • One Gen5 M.2 and two Gen4 M.2 sockets plus four SATA ports

Caractéristiques

BrandASRock
ModelB850M Pro-A
CPU Socket TypeAM5
CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Memory StandardUp to 8000+(OC)
Maximum Memory Supported256GB
Channel SupportedDual Channel
Memory Performance ProfileAMD EXPO / Intel XMP 3.0
ECC SupportedYes
Buffer SupportedUn-buffered
PCI Express 5.0 x161 x PCIe 5.0 x16 Slot (PCIE1), supports x16 mode*
* PCIE1 will run at Gen5x16 with 9000 and 7000 series processors, Gen4x8 with 8000 (Phoenix 1) series processors and Gen4x4 with 8000 (Phoenix 2) series processors.
* If M2_3 is occupied, PCIE2 will be disabled.
* Supports NVMe SSD as boot disks
- 15µ Gold Contact in VGA PCIe Slot (PCIE1)
PCI Express 4.0 x161 x PCIe 4.0 x4 Slot (PCIE2), supports x4 mode*
Serial ATA (SATA)4 x SATA 6Gb/s
M.2CPU:
- 1 x Blazing M.2 Socket (M2_1, Key M), supports type 2280 PCIe Gen5x4 (128 Gb/s) mode*
Chipset:
- 1 x Hyper M.2 Socket (M2_2, Key M), supports type 2280 PCIe Gen4x4 (64 Gb/s) mode*
- 1 x Hyper M.2 Socket (M2_3, Key M), supports type 2280 PCIe Gen4x4 (64 Gb/s) mode*
* Supports NVMe SSD as boot disks
* M2_1 is the first priority for M.2 installation.
* M2_1 will run at Gen5x4 with 9000 and 7000 series processors and Gen4x4 with 8000 (Phoenix 1 and Phoenix 2) series processors.
* M2_3 will run at Gen4x4 with 9000 and 7000 series processors, Gen4x4 with 8000 (Phoenix 1) series proc
SATA RAIDSupports RAID 0, RAID 1 and RAID 10 for SATA storage devices
Supports RAID 0, RAID 1 and RAID 10 for M.2 NVMe storage devices*
* Requires additional M.2 NVMe expansion cards to support RAID 10
Audio ChipsetRealtek ALC897
Audio Channels7.1 Channels
LAN ChipsetDragon RTL8125BG
Max LAN Speed2.5Gbps
Back I/O Ports2 x Antenna Mounting Points
1 x HDMI Port
1 x DisplayPort 1.4
1 x USB 3.2 Gen2 Type-A Port (10 Gb/s)
1 x USB 3.2 Gen2 Type-C Port
2 x USB 3.2 Gen1 Ports
4 x USB 2.0 Ports
1 x RJ-45 LAN Port
1 x BIOS Flashback Button
HD Audio Jacks: Line in / Front Speaker / Microphone
Onboard USB2 x USB 2.0 Headers (Support 4 USB 2.0 ports)
2 x USB 3.2 Gen1 Headers (Support 4 USB 3.2 Gen1 ports)
1 x Front Panel Type C USB 3.2 Gen1 Header
Other Connectors1 x SPI TPM Header
1 x Power LED and Speaker Header
1 x RGB LED Header*
3 x Addressable LED Headers**
2 x CPU Fan Connectors (4-pin) (Smart Fan Speed Control)***
3 x Chassis Fan Connectors (4-pin) (Smart Fan Speed Control)***
1 x Front Panel Audio Connector
* Supports in total up to 12V/3A, 36W LED Strip
** Support in total up to 5V/3A, 15W LED Strip
*** CPU_FAN1 supports the fan power up to 1A (12W).
*** CPU_FAN2 and CHA_FAN1~3 support the fan power up to 3A (36W).
*** CPU_FAN2 and CHA_FAN1~3 can auto detect if 3-pin or 4-pin fan is in use.
Form FactorMicro ATX
Dimensions (W x L)9.6" x 9.6"
Power Pin1 x 24 pin ATX Power Connector
1 x 8 pin 12V Power Connector (Hi-Density Power Connector)
1 x 4 pin 12V Power Connector (Hi-Density Power Connector)
BIOS Feature256Mb AMI UEFI Legal BIOS with GUI support
SoftwareSoftware
- ASRock Motherboard Utility (A-Tuning)
- ASRock Dragon 2.5G LAN Software
- ASRock Polychrome SYNC
* These utilities can be downloaded from ASRock Live Update & APP Shop.
UEFI
- ASRock EZ Mode
- ASRock Full HD UEFI
- ASRock Auto Driver Installer
- ASRock Instant Flash
Windows 11Windows OS 10 64-bit / 11 64-bit
FeaturesSuperb Productivity
- PCIe Gen5 (Graphics, M.2)
- Dual Channel DDR5
Rock-Solid Durability
- 8+2+1 Power Phase, Dr.MOS for VCore+SOC+MISC
Ultrafast Connectivity
- 2.5G LAN
EZ Update
- BIOS Flashback Button
- ASRock Auto Driver Installer
EZ Troubleshooter
- ASRock Post Status Checker
Package Contents1 x I/O Shield
2 x SATA Data Cables
1 x Screw for M.2 Socket
Poids d’expédition1.20 kg
Dimensions du colis305 × 267 × 64 mm

Autres versions de ce modèle

5 de plus dans cette gamme

Même famille, mémoire, ventirad ou fréquence différents — comparez avant de vous décider.

Questions sur cet article

How much DDR5 memory can the board address in total?

The four DIMM slots support up to 256 GB of DDR5 running in dual-channel mode.

What power-phase layout does the VRM use for sustained loads?

An 8+2+1 Dr.MOS design feeds the CPU cores, SoC and miscellaneous rails through a 6-layer PCB.

Which processor socket must the buyer already have to install this board?

The board requires an AM5-socket Ryzen 7000, 8000 or 9000 series CPU.

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