ASUS PRIME B840M-A-CSM
The board is equipped with graphics outputs for use with processors with integrated graphics core. The motherboard does not include a graphics card and without the use of a corresponding processor, these outputs will be inoperative.
CPU
Support for AMD Ryzen 7000, 8000 and 9000 series processors (Socket AM5)
Chipset
AMD B840
Memory
4× DDR5 memory slots, support up to 192 GB
DDR5 support up to 7600+ MT/s (OC)
Dual-channel memory architecture
ECC and non-ECC support, unbuffered
Support On-Die ECC function
Support for AMD Extended Profiles for Overclocking (EXPO)
ASUS Enhanced Memory Profile (AEMP) support
Slots
AMD Ryzen 9000 and 7000 series
1× PCIe 4.0 x16 slot
AMD Ryzen 8000 series
1× PCIe 4.0 x16 slot (supports x8/x4 mode)
AMD B840 chipset
2× PCIe 3.0 x16 slot (supports x1 mode)
Graphic arts
2× DisplayPort, supporting max. resolution 8K at 30 Hz (according to DP 1.4)
1× HDMI, supporting max. resolution 4K at 60 Hz (according to HDMI 2.1)
Storage
AMD Ryzen 9000 and 7000 series
1× M.2 slot, M Key, for type 2280 units (PCIe 4.0 x4 mode)
1× M.2 slot, M Key, for 2242/2260/2280 type units (PCIe 4.0 x4 mode)
AMD Ryzen 8000 series
1× M.2 slot, M Key, for type 2280 units (PCIe 4.0 x4 mode)
1× M.2 slot, M Key, for 2242/2260/2280 type units (PCIe 4.0 x4/x2 mode)
AMD B840 chipset
1× M.2 slot, M Key, for type 2280 units (PCIe 3.0 x4 mode)
4× SATA 6Gb/s
AMD RAIDXpert2 support
AMD Ryzen 9000 series
RAID 0, RAID 1, RAID 5 and RAID 10 support
AMD Ryzen 8000 series
RAID 0, RAID 1 support
AMD Ryzen 7000 series
RAID 0, RAID 1 and RAID 10 support
USB
2× USB 3.2 Gen2 (USB 3.1) ports on the back panel
2× USB-C 3.2 Gen1 (USB 3.0) ports (1 port on the back panel, 1 port available via internal USB connector)
2× USB 3.2 Gen1 (USB 3.0) ports available via internal USB connector
8× USB 2.0 ports (4 ports on the back panel, 4 ports available via internal USB connectors)
Audio
Realtek Audio Codec
7.1-channel Surround Sound High Definition Audio
HIND
1× Realtek 2.5Gigabit LAN controller
ASUS LANGuard
Internal connectors
1× 24pin ATX main power connector
1× 8pin +12V power connector
4× SATA 6Gb/s
3× M.2 slots, M Key
1× USB-C 3.2 Gen1 (USB 3.0)
1× USB 3.2 Gen1 (USB 3.0) connector (supports 2× USB 3.2 Gen1)
2x USB 2.0 connector (supports 4x USB 2.0)
1× 4pin CPU fan connector
1× 4-pin optional CPU fan connector
2× 4pin chassis fan connector
3× addressable RGB LED strip connector
1× front panel audio connector
1× SPI TPM connector
1× Clear CMOS jumper
1× 10-1pin system board connector
1× S/PDIF output connector
1× serial port connector
Rear panel ports
2× USB 3.2 Gen2 (USB 3.1)
1× USB-C 3.2 Gen1 (USB 3.0)
4× USB 2.0
2× DisplayPort
1× HDMI
1× RJ-45
3× audio jacks
1× BIOS FlashBack button
Dimensions
24.4 × 24.4 cm
Micro ATX format
