ASUS PRIME B850M-A-CSM Ports
HDMI 2.1: Outputs digital video and audio at up to 8K resolution (7680x4320) at 60hz.
DisplayPort 1.4 Out Port: Outputs digital video and audio at up to 8K resolution (7680x4320).
USB BIOS Flashback Button: Updates UEFI / BIOS from file on connected USB drive without entering pre-boot menu or OS.
USB 2.0 Port(s): Universal Serial Bus (USB) port for connecting USB 2.0 and older devices (480 Mb/s).
USB Flashback Port: Special USB port supporting BIOS flashback. Insert USB drive with BIOS file to flash BIOS.
USB 3.2 Gen 2 (USB 3.1) Port(s): Universal Serial Bus (USB) port for connecting USB 3.2 Gen 2 and older devices (10 Gb/s).
USB 3.2 Gen 2 (USB 3.1) Port(s): Universal Serial Bus (USB) port for connecting USB 3.2 Gen 2 and older devices (10 Gb/s).
2.5G LAN (RJ45): RJ-45 plug for connecting to a wired Local Area Network (LAN) via Ethernet at up to 2.5 Gb
Audio Jacks: 3.5mm analog audio jacks for various input and output functions (see manual for more information).
ASUS PRIME B850M-A-CSM Schematic
For external connectivity, this board has basic analog audio outputs, 2.5Gb Ethernet, and eight USB Type-A ports of varying speeds. There are also HDMI, DisplayPort, and VGA outputs for use with the graphics built into AMD's Ryzen processors, though most users will want to add a dedicated video card for improved performance.
With no built-in WiFi or Bluetooth, this is a great motherboard option for users who need to comply with government or corporate limits on wireless connectivity.
Model: Asus 90MB1LQ0-MUAAYC
Specifications
| Socket | AM5 |
| CPU Compatibility | Ryzen 7000 and 9000 series CPUs |
| Form Factor | MicroATX |
| Chipset Manufacturer | AMD |
| Chipset | B850 |
| Wired Network Connectivity | 2.5G Networking |
| Network Controller | Realtek RTL8125 |
| Audio Controller | Realtek 7.1 Surround Sound High Definition Audio CODEC |
| Color | Black & Silver |
| Windows Support | Windows 10/11 |
Memory Support | |
| Type | DDR5 |
| Maximum Speed | 5600 MHz |
| Number of Slots | 4 |
| Maximum Size per Slot | 64 GB |
| Maximum Amount Supported | 256 GB |
Onboard Video | |
| Chipset Manufacturer | AMD |
| Maximum HDMI Resolution | 4096x2160 |
| Maximum DisplayPort Resolution | 7680x4320 |
| HDMI | 1 |
| HDMI Version | 2.1 |
| DisplayPort | 2 |
| DisplayPort Version | 1.4 |
External Connections | |
| USB 2.0 | 4 |
| USB 3.2 Gen 1 (USB 3.0) | 2 |
| USB 3.2 Gen 2 (USB 3.1) | 2 |
| Audio Out | Surround Sound (7.1) |
| Audio In | Line-In/Microphone |
| LAN (RJ45) | 1 |
| BIOS Flashback | Yes |
Internal Connections | |
| USB 2.0 | 2 (providing 4 ports) |
| USB 3.2 Gen 1 (USB 3.0) | 1 |
| USB 3.2 Gen 1 Type C | 1 |
| SATA III 6.0Gbps | 4 |
| M.2 Connector | 3 |
| M.2 Support | NVMe |
| Maximum M.2 Length | 80 mm (3.1 in) |
| Serial (Com) | 1 |
| TPM (module sold separately) | 1 |
| Compatible TPM | 14-1 |
| Notes: | TPM options include ASUS TPM-SPI or ASUS TPM-M R2.0 |
Expansion Slots | |
| Slot 1 | PCI Express 5.0 x16 |
| Slot 4 | PCI Express 4.0 x1 in a x16 size |
Additional Information | |
| Bluetooth | Yes (5.3) |
| Integrated IO Shield | Yes |
BIOS Features | |
| UEFI BIOS | Yes |
| EZ Flash | Yes |
| OC Profiles | Yes |
Dimensions | |
| Height | 244 mm (9.6 in) |
| Width | 244 mm (9.6 in) |
