MSI PRO B840M-B

PRO B840M-B is engineered with many exclusive features of MSI, PCIe 4.0 M.2, EZ PCIe Clip II, 2.5G LAN, and Front Type-C, ready for the AMD Ryzen 9000 series processors.

CPU

Supports AMD Ryzen™ 9000/ 8000/ 7000 Series Desktop ProcessorsSocket AM5

Chipset

AMD B840

Memory

2x DDR5 UDIMM, Maximum Memory Capacity 128GBMemory Support DDR5 8000 - 5600 (OC) MT/s / 5600 - 4800 (JEDEC) MT/sRyzen™ 9000 Series Processors max. overclocking frequency:• 1DPC 1R Max speed up to 8000+ MT/s• 1DPC 2R Max speed up to 7200+ MT/sSupports AMD POR Speed and JEDEC SpeedSupports Memory Overclocking and AMD EXPOTMSupports Dual-Channel modeSupports Non-ECC, Un-buffered memorySupports CUDIMM, Clock Driver bypass mode only CUDIMM support and POR boot frequency may vary by CPU series, with manual overclocking available after boot. Certain CPUs may fail to boot, but future BIOS updates will improve compatibility.• The DIMM slots on this motherboard have single-sided latches.• Memory compatibility and supported speeds can vary depending on the CPU and memory configuration. For detailed information, please refer to the Memory Compatibility List available on the product’s Support page or visit https://www.msi.com/support/.

Onboard Graphics

1x HDMI™Support HDMITM 2.1, maximum resolution of 4K 60Hz*1x VGASupport VGA, maximum resolution of 2048x1536 50Hz, 2048x1280 60Hz, 1920x1200 60HzAvailable only on processors featuring integrated graphics. Graphics specifications may vary depending on the CPU installed.

Expansion Slots

1x PCI-E x16 slot1x PCI-E x1 slotPCI_E1 Gen PCIe 4.0 supports up to x16 (From CPU)PCI_E2 Gen PCIe 3.0 supports up to x1 (From Chipset)PCI_E1 slot• Supports PCIe 4.0 x16 (For Ryzen™ 9000/ 7000 Series processors)• Supports PCIe 4.0 x8 (For Ryzen™ 8700/ 8600/ 8400 Series processors)• Supports PCIe 4.0 x4 (For Ryzen™ 8500/ 8300 Series processors)

Audio

Realtek ALC8977.1-Channel High Definition Audio

Storage

2x M.2M.2_1 Source (From CPU) supports up to PCIe 4.0 x4 , supports 2280/2260 devicesM.2_2 Source (From CPU) supports up to PCIe 4.0 x4 , supports 2280/2260 devices4x SATA 6GM2_2 slot• Supports up to PCIe 4.0 x4• Supports up to PCIe 4.0 x2 (For Ryzen™ 8500/ 8300 Series processors)Supports RAID 0, RAID 1 and RAID 10 for SATA storage devicesSupports RAID 0 and RAID 1 for M.2 NVMe storage devices

USB

2x USB 2.0 (Rear)4x USB 2.0 (Front)4x USB 5Gbps Type A (Rear)2x USB 5Gbps Type A (Front)1x USB 5Gbps Type C (Front)

LAN

Realtek 8125D 2.5G LAN

Internal I/O

1x Power Connector(ATX_PWR)1x Power Connector(CPU_PWR)1x CPU Fan2x System Fan2x Front Panel (JFP)1x Chassis Intrusion (JCI)1x Front Audio (JAUD)1x Com Port (JCOM)3x Addressable V2 RGB LED connector (JARGB_V2)1x RGB LED connector(JRGB)1x TPM pin header(Support TPM 2.0)4x USB 2.0 ports2x USB 5Gbps Type A ports1x USB 5Gbps Type C ports

Back Panel I/O

1x Clear CMOS Button1x HDMI™1x VGA4x USB 5Gbps Typ-A1x 2.5G LAN3x Audio connectors1x Flash BIOS Button2x USB 2.0

Operating System

Support for Windows 11 64-bit

Form Factor

mATX226 x 244 mm