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Asus Prime B850M-A WIFI-CSM Motherboard, Socket AM5, AMD B850, M-ATX

 

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Asus
Part no 90MB1LN0-M0UAYC
Ascent part no 799767
NZ support 0-800-278-778
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The ASUS PRIME B850M-A WIFI-CSM is a microATX motherboard designed for AMD Socket AM5 processors, featuring the AMD B850 chipset for next-generation performance and stability. It is equipped with Wi-Fi 6E, ultra-fast USB 3.2 Gen 2x2 (10Gbps), robust power delivery, and expansive connectivity, including PCIe 5.0 and M.2 slots. Tailored for professional builds and everyday computing, it delivers both reliability and comprehensive features for productivity, business, and home use. With CSM enterprise stability, Aura Sync RGB, and various diagnostic features, it ensures long-term dependability and easy setup.

Technical Specifications

Product NameASUS PRIME B850M-A WIFI-CSM
ManufacturerAsus
Model Number90MB1LN0-M0UAYC
Product LineASUS Prime
Product CategoryMotherboards
CPU Support
SocketAM5
Supported CPUsAMD Ryzen 7000 Series Desktop Processors
ChipsetAMD B850
Memory
Memory TypeDDR5
DIMM Slots4 x DIMM (Dual Channel)
Max Capacity192 GB
Memory OC SupportUp to 7600+ (OC)
Expansion Slots
PCI Express x161 x PCIe 5.0 x16
PCI Express x12 x PCIe 4.0 x1
Storage
M.2 Slots2 x M.2 (supports PCIe 4.0 x4)
SATA Ports4 x SATA 6Gb/s
Graphics Output
HDMI1 x HDMI 2.1
DisplayPort1 x DisplayPort 1.4
USB Ports
Rear
1 x USB 3.2 Gen 2x2 Type-C
2 x USB 3.2 Gen 2 Type-A
2 x USB 3.2 Gen 1 Type-A
4 x USB 2.0
Front (internal)
1 x USB 3.2 Gen 1 header supports 2 additional USB 3.2 Gen 1 ports
2 x USB 2.0 headers support 4 additional USB 2.0 ports
LAN
Ethernet1 x Realtek 2.5Gb LAN
Wireless & Bluetooth
WiFiWi-Fi 6E (802.11ax)
BluetoothBluetooth v5.3
Audio
CodecRealtek 7.1 Surround Sound High Definition Audio CODEC
Internal I/O
1 x 24-pin Main Power Connector
1 x 8-pin + 1 x 4-pin CPU Power Connectors
4 x SATA 6Gb/s Connectors
2 x M.2 Sockets
1 x CPU Fan Connector
2 x Chassis Fan Connectors
1 x AIO Pump Connector
1 x Addressable Gen 2 RGB Header
1 x Aura RGB Header
Form FactorMicroATX, 24.4 cm x 24.4 cm
Special Features
CSM (Corporate Stable Model) commercial support
AI Noise Cancellation
Armoury Crate
ASUS CrashFree BIOS 3
ASUS EZ Flash 3
Warranty Information3 years manufacturer warranty
Overall SentimentGenerally positive — reviewers highlight the board's reliability, connectivity, and business stability, with suitable features for mainstream builds though not for extreme overclocking.

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Please read our terms and conditions. We try very hard to make sure the specification and images on this page are accurate, but occasionally (and thankfully rarely) mistakes do happen. If you discover the product delivered is not as described, please let us know as soon as possible after delivery so we can correct the mistake and arrange for the product to be returned.

Asus
Part no 90MB1LN0-M0UAYC
Ascent part no 799767
NZ support 0-800-278-778
  • Free NZ deliveryNo hidden fees
  • 100% Kiwi owned34 years in business
  • Net Promoter Score 94Rated by our customers
Questions? (04) 802 3890


"I ordered at 4 15pm, i live rural. It was delivered before lunchtime the following day. Incredible speed" Ben, 4 September 2026
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