Micron Technology, Inc.
Micron Technology, Inc. MT4JTF12864AZ-1G4D1 1GB DDR3 1333 Desktop RAM
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ASUS
ASUS 90MB1LN0-MVAAYC PRIME B850M-A WIFI-CSM AMD motherboard
An AM5 mATX board for Ryzen 7000, 8000 and 9000 CPUs with DDR5 up to 8000 MT/s, PCIe 5.0 x16 and M.2 slots, Wi‑Fi 6E and 2.5 Gb LAN
- CPU Socket TypeAM5
- CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
- ChipsetAMD B850
- Number of Memory Slots4x288pin (DDR5)
- Memory StandardSupports up to 8000+MT/s (OC)
- Maximum Memory Supported256GB
- Ready for AI workloads with AM5 socket support for Ryzen 9000, 8000 and 7000 series processors
- Stable business supply through ASUS CSM programme with end-of-life notifications and IT management software
- Simplified enterprise administration via ASUS Control Center Express remote monitoring and management
- Reliable power delivery using 6-layer PCB, alloy chokes and durable capacitors for consistent performance
- Ultrafast connectivity with Wi-Fi 6E, PCIe 5.0 x16 slot, PCIe 5.0 M.2 slot, Realtek 2.5Gb Ethernet and USB 10Gbps Type-A ports
AM5 socket for Ryzen 7000 8000 9000 series
This mATX board targets builders who need a stable platform for AMD Ryzen 7000 8000 and 9000 series processors. The CSM programme guarantees long-term availability and IT management tools for business deployments. Dual-channel DDR5 memory supports up to 256 GB with AMD EXPO and ASUS AEMP profiles. PCIe 5.0 x16 and a PCIe 5.0 M.2 slot come from the CPU on Ryzen 9000 and 7000 models.
VRM M.2 PCH heatsinks Fan Xpert 2+
A six-layer PCB with alloy chokes and durable capacitors feeds the CPU while VRM M.2 and PCH heatsinks dissipate heat. Hybrid fan headers and Fan Xpert 2+ adjust airflow to workload so the system stays quiet under normal desktop use. Realtek 2.5 Gb Ethernet Wi-Fi 6E and rear USB 10 Gbps Type-A ports keep network and peripheral traffic moving without extra cards.
PCIe 5.0 M.2 slot from CPU
The M.2_1 slot runs at PCIe 5.0 x4 when paired with Ryzen 9000 or 7000 series processors and drops to PCIe 4.0 x4 with Ryzen 8000 series. A second M.2_2 slot provides PCIe 4.0 x4 storage. Four SATA 6 Gbps ports add bulk capacity. This CPU-dependent lane split is the single spec that decides whether the board fits a given build.
Highlights
- Ready for AI workloads with AM5 socket support for Ryzen 9000, 8000 and 7000 series processors
- Stable business supply through ASUS CSM programme with end-of-life notifications and IT management software
- Simplified enterprise administration via ASUS Control Center Express remote monitoring and management
- Reliable power delivery using 6-layer PCB, alloy chokes and durable capacitors for consistent performance
- Ultrafast connectivity with Wi-Fi 6E, PCIe 5.0 x16 slot, PCIe 5.0 M.2 slot, Realtek 2.5Gb Ethernet and USB 10Gbps Type-A ports
Specifications
| Brand | ASUS |
|---|---|
| Model | PRIME B850M-A WIFI-CSM |
| 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 | Supports up to 8000+MT/s (OC) |
| Maximum Memory Supported | 256GB |
| Channel Supported | Dual Channel |
| Memory Performance Profile | AMD EXPO |
| ECC Supported | Yes |
| Buffer Supported | Un-buffered |
| Memory Feature | ASUS Enhanced Memory Profile (AEMP) |
| PCI Express 5.0 x16 | AMD Ryzen 9000 & 7000 Series Desktop Processors 1 x PCIe 5.0 x16 slot (supports x16 mode) AMD Ryzen 8000 Series Desktop Processors 1 x PCIe 4.0 x16 slot (supports x8/x4 mode) |
| PCI Express 4.0 x16 | AMD B850 Chipset 1 x PCIe 4.0 x16 slot (supports x1 mode) |
| Serial ATA (SATA) | 4 x SATA 6Gb/s |
| M.2 | AMD Ryzen 9000 & 7000 Series Desktop Processors M.2_1 slot (Key M), type 2280 (supports PCIe 5.0 x4 mode) M.2_2 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode) AMD Ryzen 8000 Series Desktop Processors M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode) M.2_2 slot (Key M), type 2280 (supports PCIe 4.0 x4/x2 mode)* AMD B850 Chipset M.2_3 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode) |
| SATA RAID | AMD RAIDXpert2 Technology Ryzen 9000 Series Processors: RAID 0/1/5/10 Ryzen 8000 Series Processors: RAID 0/1 Ryzen 7000 Series Processors: RAID 0/1/10 |
| Audio Channels | Realtek 7.1 Surround Sound High Definition Audio CODEC* - Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking - Supports up to 24-Bit/192 kHz playback Audio Features - Audio Shielding - Premium audio capacitors - Dedicated audio PCB layers * A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output. |
| Max LAN Speed | 2.5Gbps |
| Wireless LAN | Wi-Fi 802.11 ax |
| Bluetooth | Bluetooth 5.4 |
| Back I/O Ports | 2 x USB 10Gbps ports (2 x Type-A) 2 x USB 5Gbps ports (2 x Type-A) 4 x USB 2.0 ports (4 x Type-A) 2 x DisplayPort 1 x HDMI port 1 x Wi-Fi module 1 x Realtek 2.5Gb Ethernet port 3 x Audio jacks 1 x BIOS FlashBack button |
| Onboard USB | 1 x USB 5Gbps connector (supports USB Type-C) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports |
| Other Connectors | Fan and Cooling Related 1 x 4-pin CPU Fan header 1 x 4-pin CPU OPT Fan header 1 x 4-pin AIO Pump header 3 x 4-pin Chassis Fan headers Miscellaneous 3 x Addressable RGB Gen 2 headers 1 x Clear CMOS header 1 x Chassis Intrusion header 1 x COM Port header 1 x Front Panel Audio header (F_AUDIO) 1 x S/PDIF Out header 1 x SPI TPM header (14-1 pin) 1 x 10-1 pin System Panel header |
| Form Factor | Micro ATX |
| Dimensions (W x L) | 9.6" x 9.6" |
| Power Pin | 1 x 24-pin Main Power connector 1 x 8-pin +12V CPU Power connector 1 x 4-pin +12V CPU Power connector |
| BIOS Feature | 256 Mb Flash ROM, UEFI AMI BIOS |
| Software | ASUS Exclusive Software Armoury Crate - Aura Creator - Aura Sync - Fan Xpert 2+ - Power Saving ASUS AI Advisor ASUS Driver Hub ASUS GlideX TurboV Core ASUS CPU-Z Adobe Creative Cloud (Free Trial) Norton 360 Deluxe (60 Days Free Trial) WinRAR (40 Days Free Trial) UEFI BIOS ASUS EZ DIY - ASUS CrashFree BIOS 3 - ASUS EZ Flash 3 - ASUS UEFI BIOS EZ Mode - ASUS MyHotkey |
| Windows 11 | Supported |
| Features | ASUS 5X PROTECTION III - DIGI+ VRM - LANGuard - Overvoltage protection - SafeSlot - Stainless-steel back I/O ASUS Q-Design - Q-Antenna - Q-Dashboard - Q-DIMM - Q-LED Core - Q-Slot ASUS Thermal Solution - M.2 heatsink - VRM heatsink design ASUS EZ DIY - BIOS FlashBack button - BIOS FlashBack LED - Pre-mounted I/O shield - SafeSlot Aura Sync - Addressable RGB Gen 2 headers |
| Package Contents | Cables 2 x SATA 6Gb/s cables Miscellaneous 1 x ASUS WiFi Q-Antenna 1 x M.2 rubber package 1 x Screw package for M.2 SSD Documentation 1 x Quick start guide |
| Shipping weight | 1.36 kg |
| Package size | 279 × 279 × 76 mm |
Questions about this item
How do I install the AM5 processor and what step is most often missed?
Lift the socket lever, align the triangle on the CPU with the socket corner, lower the lever and lock it; the step often missed is removing the protective cover from the socket before placing the processor.
What maintenance will the board need over its life?
Dust the VRM and M.2 heatsinks periodically and clean the fan headers so Fan Xpert 2+ can keep temperatures stable.
What limit appears first during sustained heavy loads?
The VRM and M.2 heatsinks set the thermal ceiling; once they saturate, Fan Xpert 2+ ramps the hybrid headers to maximum airflow.
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