Micron Technology, Inc.
Micron Technology, Inc. MT4JTF12864AZ-1G4D1 1GB DDR3 1333 Desktop RAM
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ASRock
ASRock B850M Pro RS WiFi AM5 AMD motherboard
Micro-ATX AM5 board with PCIe 5.0 x16, Gen5 and Gen4 M.2 slots, 4 SATA ports, 7.1 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
- Supports Ryzen 7000, 8000 and 9000 series CPUs via AM5 socket
- 8+2+1 phase Dr.MOS power design delivers stable voltage to VCore, SOC and MISC
- Four DDR5 slots support dual-channel up to 8000+ OC with EXPO and XMP 3.0
- PCIe 5.0 x16 slot plus PCIe 4.0 x4 slot for GPU and expansion cards
- One Blazing M.2 Gen5x4 and two Hyper M.2 Gen4x4 sockets plus four SATA 6Gb/s ports
AM5 Micro-ATX board for Ryzen 7000 8000 9000
This ASRock B850M Pro RS WiFi motherboard fits AM5 socket Ryzen 7000 8000 and 9000 series processors in a Micro-ATX form factor. It uses the AMD B850 chipset and an 8+2+1 phase Dr.MOS power design. Four DDR5 slots support up to 256 GB in dual channel with AMD EXPO and Intel XMP 3.0 profiles. ECC un-buffered memory is supported.
Who this suits and who should look elsewhere
Builders wanting a compact board with one PCIe 5.0 x16 slot and two PCIe 4.0 M.2 sockets will find the layout practical. The rear I/O includes HDMI DisplayPort 2.5 GbE LAN USB 3.2 Gen2 Type-C and Type-A plus Wi-Fi. Users needing more than one full-size PCIe 5.0 slot or more than three M.2 sockets should consider a full-size ATX alternative.
PCIe 5.0 M.2 decides the storage ceiling
The CPU-linked Blazing M.2 socket delivers PCIe Gen5 x4 bandwidth up to 128 Gb/s for a single 2280 NVMe drive. Two chipset Hyper M.2 sockets add PCIe Gen4 x4 at 64 Gb/s each. Four SATA 6 Gb/s ports and RAID 0 1 10 support round out the storage options. This Gen5 M.2 lane is the single spec that determines whether the board matches your fastest drive.
Highlights
- Supports Ryzen 7000, 8000 and 9000 series CPUs via AM5 socket
- 8+2+1 phase Dr.MOS power design delivers stable voltage to VCore, SOC and MISC
- Four DDR5 slots support dual-channel up to 8000+ OC with EXPO and XMP 3.0
- PCIe 5.0 x16 slot plus PCIe 4.0 x4 slot for GPU and expansion cards
- One Blazing M.2 Gen5x4 and two Hyper M.2 Gen4x4 sockets plus four SATA 6Gb/s ports
Specifications
| Brand | ASRock |
|---|---|
| Model | B850M PRO RS WIFI |
| CPU Socket Type | AM5 |
| CPU Type | Ryzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series |
| Chipset | AMD B850 |
| Number of Memory Slots | 4x288pin (DDR5) |
| Memory Standard | Up to 8000+(OC) |
| Maximum Memory Supported | 256GB |
| Channel Supported | Dual Channel |
| Memory Performance Profile | AMD EXPO / Intel XMP 3.0 |
| ECC Supported | Yes |
| Buffer Supported | Un-buffered |
| PCI Express 5.0 x16 | 1 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 x16 | 1 x PCIe 4.0 x4 Slot (PCIE2), supports x4 mode* |
| Serial ATA (SATA) | 4 x SATA 6Gb/s |
| M.2 | CPU: - 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 RAID | Supports 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 Chipset | Realtek ALC897 |
| Audio Channels | 7.1 Channels |
| LAN Chipset | Dragon RTL8125BG |
| Max LAN Speed | 2.5Gbps |
| Wireless LAN | Wi-Fi 802.11 ax |
| Bluetooth | Bluetooth 5.2 |
| Back I/O Ports | 2 x Antenna Ports 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 USB | 2 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 Connectors | 1 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 Factor | Micro ATX |
| Dimensions (W x L) | 9.6" x 9.6" |
| Power Pin | 1 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 Feature | 256Mb AMI UEFI Legal BIOS with GUI support |
| Software | Software - 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 11 | Windows OS 10 64-bit / 11 64-bit |
| Features | Superb Productivity - PCIe Gen5 (Graphics, M.2) - Dual Channel DDR5 Rock-Solid Durability - 8+2+1 Power Phase, Dr.MOS for VCore+SOC+MISC - Pre-Installed I/O Shield Ultrafast Connectivity - 2.5G LAN, 802.11axe Wi-Fi 6E Module EZ Update - BIOS Flashback Button - ASRock Auto Driver Installer EZ Troubleshooter - ASRock Post Status Checker |
| Shipping weight | 1.36 kg |
| Package size | 292 × 254 × 64 mm |
Questions about this item
What does the 8000+(OC) DDR5 rating mean once the board is built into a system?
The board can run DDR5 memory up to 8000 MT/s when overclocked via AMD EXPO or Intel XMP 3.0 profiles, provided the installed Ryzen 7000, 8000 or 9000 series processor and memory modules support that speed.
How does the PCIe 5.0 x16 slot's speed change with different Ryzen series processors?
With Ryzen 9000 or 7000 series CPUs the slot runs at Gen5 x16; with Ryzen 8000 Phoenix 1 it drops to Gen4 x8; with Phoenix 2 it drops further to Gen4 x4.
What physical space and mounting points does this micro-ATX board need inside a case?
It fits a standard micro-ATX chassis with the usual nine mounting holes and uses the same I/O shield cut-out as other AM5 boards.
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