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Brand

MSI
Model

MSI Pro B840M-B
Chipset

AMD B840
CPU

Supports AMD Ryzen™ 9000/ 8000/ 7000 Series Desktop Processors
Socket AM5
Socket

AM5
Memory Channel

Dual Channel DDR5
DIMM Slots

2
Max Memory

128 GB
Expansion Slots

1x PCI-E x16 slot
1x PCI-E x1 slot
PCI_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)
Storage

2x M.2
M.2_1 Source (From CPU) supports up to PCIe 4.0 x4 , supports 2280/2260 devices
M.2_2 Source (From CPU) supports up to PCIe 4.0 x4 , supports 2280/2260 devices
4x SATA 6G

M2_2 slot
• Supports up to PCIe 4.0 x4
• Supports up to PCIe 4.0 x2 (For Ryzen™ 8500/ 8300 Series processors)
M.2 Slot

2
Raid

Supports RAID 0, RAID 1 and RAID 10 for SATA storage devices
Supports RAID 0 and RAID 1 for M.2 NVMe storage devices
USB Ports

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 IO

1x Power Connector(ATX_PWR)
1x Power Connector(CPU_PWR)
1x CPU Fan
2x System Fan
2x 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 ports
2x USB 5Gbps Type A ports
1x USB 5Gbps Type C ports
LED Feature

4x EZ Debug LED
1x EZ Memory Detection LED
Back Panel Ports

Clear CMOS Button
HDMI™
VGA
USB 5Gbps Type-A
2.5G LAN
Audio connectors
Flash BIOS Button
USB 2.0
Operating System

Support for Windows® 11 64-bit
PCB Dimension (LxW)

mATX, 226mmx243.84mm
Onboard Graphics

1x HDMI™
Support HDMITM 2.1, maximum resolution of 4K 60Hz*
1x VGA
Support VGA, maximum resolution of 2048×1536 50Hz, 2048×1280 60Hz, 1920×1200 60Hz*
*Available only on processors featuring integrated graphics. Graphics specifications may vary depending on the CPU installed.
Audio

Realtek® ALC897
7.1-Channel High Definition Audio
Warranty

1 Year

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