Description
The ASUS PRIME B850M-A-CSM motherboard, in grey, is designed for builds with AMD Ryzen processors on the AM5 socket. AMD Ryzen 7000 Series, 8000 Series and 9000 Series are supported for installation. It features four DIMM slots for unbuffered DDR5-SDRAM memory, with dual channel support and a maximum capacity of 256 GB, up to 64 GB per slot. The maximum supported memory clock speed reaches 8000 MHz and it is compatible with both ECC and non-ECC modules. In the storage section it offers RAID support with levels 0, 1, 5 and 10, for a total of seven supported drives and up to four HDDs, with PCI Express 4.0 and PCI Express 5.0 interfaces.
Specifications
Processor
- Processor manufacturer: AMD
- Processor socket: Socket AM5
- Compatible processor series: AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series
- Supported processor sockets: Socket AM5
Memory
- Supported memory types: DDR5-SDRAM
- Number of memory slots: 4
- Memory slots type: DIMM
- Memory channels: Dual-channel
- ECC сompatibility: ECC & Non-ECC
- Supported memory clock speed (max): 8000 MHz
- Maximum internal memory: 256 GB
- Unbuffered memory: Yes
- Maximum internal memory per slot: 64 GB
Storage controllers
- Supported storage drive types: HDD & SSD
- Supported storage drive interfaces: PCI Express 4.0, PCI Express 5.0
- Number of HDDs supported: 4
- Number of storage drives supported: 7
- RAID support: Yes
- RAID levels: 0, 1, 5, 10
Graphics
- Parallel processing technology support: Not supported
- Maximum resolution: 7680 x 4320 pixels
Internal I/O
- USB 2.0 connectors: 2
- USB 3.2 Gen 1 (3.1 Gen 1) connectors: 2
- Number of SATA III connectors: 4
- S/PDIF out connector: Yes
- Front panel audio connector: Yes
- Front panel connector: Yes
- ATX Power connector (24-pin): Yes
- CPU fan connector: Yes
- Number of CPU fan connectors: 1
- Number of chassis fan connectors: 3
- Chassis intrusion connector: Yes
- Peripheral (Molex) power connectors (4-pin): 1
- EPS power connector (8-pin): Yes
- Number of EPS power connectors (8-pin): 1
- Number of COM connectors: 1
- TPM connector: Yes
- 12V power connector: Yes
- RGB LED pin header: Yes
- Number of RGB LED pin headers: 3
Rear panel I/O ports
- USB 2.0 ports quantity: 4
- USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity: 2
- USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity: 2
- Ethernet LAN (RJ-45) ports: 1
- HDMI ports quantity: 1
- HDMI version: 2.1
- DisplayPorts quantity: 2
- DisplayPort version: 1.4
- Headphone outputs: 1
- Line-in: Yes
- Microphone in: Yes
Network
- Ethernet LAN: Yes
- Ethernet interface type: 2.5 Gigabit Ethernet
- Wi-Fi: No
Features
- Motherboard chipset: AMD B850
- Audio output channels: 7.1 channels
- Product colour: Grey
- Component for: PC
- Motherboard form factor: micro ATX
- Motherboard chipset family: AMD
- Cooling type: Passive
- Power source type: ATX
- Windows operating systems supported: Windows 10 x64, Windows 11
Expansion slots
- PCI Express x16 (Gen 4.x) slots: 2
- PCI Express x16 (Gen 5.x) slots: 1
- Number of M.2 (M) slots: 3
- 1st M.2 largest key size: 2280
- 1st M.2 highest PCI Express generation: 5.0
- 2nd M.2 largest key size: 2280
- 2nd M.2 highest PCI Express generation: 4.0
- 3rd M.2 largest key size: 2280
- 3rd M.2 highest PCI Express generation: 4.0
- 4th M.2 largest key size: 2280
- 4th M.2 highest PCI Express generation: 4.0
BIOS
- BIOS type: UEFI AMI
- BIOS memory size: 256 Mbit
Packaging data
- Package width: 275 mm
- Package depth: 275 mm
- Package height: 67.5 mm
- Package weight: 1.45 kg
Weight & dimensions
- Width: 244 mm
- Depth: 244 mm
Packaging content
- Cables included: SATA
- Screws included: Yes
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