MSI MPG MAG B850M MORTAR

  • Supports AMD Ryzen™ 9000 / 8000 / 7000 Series Desktop Processors
  • Supports DDR5 Memory, Dual Channel DDR5 8200+ MT/s (OC)
  • Ultra Performance: 12+2+1 Duet Rail Power System, dual 8-pin CPU power connectors, Core Boost, Memory Boost, 8-layer PCB made by 2oz thickened copper material
  • EZ DIY: EZ M.2 Shield Frozr II, EZ M.2 Clip II, EZ PCIe Release and EZ Antenna
  • Lightning Fast Game experience: PCIe 5.0 slot, Lightning Gen 5 x4 M.2, 20G USB Type-C
  • Audio Boost 5: Reward your ears with studio grade sound quality for the most immersive gaming experience
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Specification Details
Chipset AMD B850
CPU Supports AMD Ryzen 9000 / 8000 / 7000 Series Desktop Processors
Socket AM5
Memory
Configuration 4x DDR5 UDIMM, Maximum Memory Capacity 256GB
Memory Support DDR5 8200 – 5600 (OC) MT/s / 5600 – 4800 (JEDEC) MT/s
Ryzen 9000 Series Max Overclocking Frequency 1DPC 1R: Up to 8200+ MT/s
1DPC 2R: Up to 6400+ MT/s
2DPC 1R: Up to 6400+ MT/s
2DPC 2R: Up to 6400+ MT/s
Features Supports AMD POR Speed and JEDEC Speed
Supports Memory Overclocking and AMD EXPO
Supports Dual-Channel mode
Supports Non-ECC, Un-buffered memory
Supports CUDIMM, Clock Driver bypass mode only*
Notes * 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 only have single-sided latch.
– Memory compatibility and supported speeds can vary depending on CPU and memory configuration. For detailed information, visit https://www.msi.com/support/.
Onboard Graphics
Ports 1x HDMI
Supports HDMI 2.1 FRL, maximum resolution 8K 60Hz*
*Available only on processors featuring integrated graphics. Graphics specifications may vary depending on CPU installed.
Expansion Slots
Slots 1x PCI-E x16 Slot
1x PCI-E x4 Slot
PCI_E1 Gen PCIe 5.0 supports up to x16 (From CPU)
PCI_E2 Gen PCIe 4.0 supports up to x4 (From Chipset)
PCI_E1 Slot – PCIe 5.0 x16 (Ryzen 9000 / 7000)
– PCIe 4.0 x8 (Ryzen 8700 / 8600 / 8400)
– PCIe 4.0 x4 (Ryzen 8500 / 8300)
Audio
Codec Realtek ALC4080 Codec
Channels 7.1-Channel USB High Performance Audio
Playback Supports up to 32-bit / 384 kHz playback on front panel
Output Supports S/PDIF output
Storage
Configuration 3x M.2
M.2_1 (From CPU): PCIe 5.0 x4, supports 2280/2260 devices
M.2_2 (From CPU): PCIe 5.0 x4, supports 2280/2260 devices
M.2_3 (From Chipset): PCIe 4.0 x2, supports 2280 devices
4x SATA 6G
M.2_1 Slot – PCIe 5.0 x4 (Ryzen 9000 / 7000)
– PCIe 4.0 x4 (Ryzen 8000)
M.2_2 Slot – PCIe 5.0 x4 (Ryzen 9000 / 7000)
– PCIe 4.0 x4 (Ryzen 8700 / 8600 / 8400)
– PCIe 4.0 x2 (Ryzen 8500 / 8300)
M.2_3 Slot – PCIe 4.0 x2
Notes ** Refer to the manual for M.2 SSD heatsink restrictions.
Multi-GPU
Support AMD MULTI-GPU Support
RAID
Support Supports RAID 0, RAID 1, and RAID 10 for SATA storage devices
Supports RAID 0, RAID 1, and RAID 5 for M.2 NVMe storage devices
* RAID 5 supported only on Ryzen 9000 Series processors
USB
Configuration 4x USB 2.0 (Front)
4x USB 5Gbps Type A (Rear)
2x USB 5Gbps Type A (Front)
3x USB 10Gbps Type A (Rear)
1x USB 10Gbps Type C (Rear)
1x USB 10Gbps Type C (Front)
1x USB 20Gbps Type C (Rear)
LAN
Port Realtek 8126-VB 5G LAN
Internal I/O
Connectors 1x Power Connector(ATX_PWR)
2x Power Connector(CPU_PWR)
1x Power Connector(PCIE_PWR 8pin)
1x CPU Fan
1x Combo Fan (Pump_Sys Fan)
4x System Fan
2x Front Panel (JFP)
1x Chassis Intrusion (JCI)
1x Front Audio (JAUD)
1x Tuning Controller connector(JDASH)
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 10Gbps Type C ports
LED Feature
Indicators 4x EZ Debug LED
1x EZ Memory Detection LED
Back Panel Ports
Configuration

  1. Clear CMOS Button
  2. 5G LAN
  3. USB 10Gbps Type-A
  4. USB 5Gbps Type-A
  5. Audio Connectors
  6. Flash BIOS Button
  7. HDMI™
  8. USB 10Gbps Type-A
  9. USB 10Gbps Type-C
  10. USB 20Gbps Type-C
  11. Optical S/PDIF Out
Operating System
Support Windows 11 64-bit
Box Content
INCLUDES
PCB INFO
mATX
243.84mmx243.84mm

Overview

MSI MAG B850M MORTAR

The MSI MAG B850M MORTAR is a durable, performance-oriented Micro-ATX motherboard built on the AMD B850 chipset, designed to support the latest AMD Ryzen™ 9000, 8000, and 7000 Series desktop processors on the AM5 platform. It delivers a balance of power, cooling, and expandability — ideal for gamers and creators looking to build a reliable mid-sized PC setup.

Power & Performance
With a 12 + 2 + 1 Duet Rail Power System and high-quality DrMOS components, this board ensures stable power delivery to high-performance CPUs. It supports dual-channel DDR5 memory up to 256 GB, with speeds reaching 8400+ MHz (OC) for exceptional multitasking and gaming performance.

Expansion & Storage
The MAG B850M MORTAR offers a PCIe 5.0 x16 slot for next-gen GPUs and dual M.2 slots—one PCIe 5.0 x4 and one PCIe 4.0 x4—to support the fastest NVMe SSDs. Multiple SATA 6 Gb/s ports provide flexibility for traditional storage solutions, making it easy to expand storage without compromise.

Connectivity
It features a 2.5 Gb LAN port for fast and stable wired connections, along with multiple USB 3.2 Gen 2 and Gen 1 ports, including USB Type-C support. The inclusion of HDMI™ and DisplayPort outputs allows easy use of Ryzen processors with integrated Radeon™ graphics.

Cooling & Design
MSI’s extended heatsink design, M.2 Shield FROZR, and high-efficiency thermal pads ensure consistent performance under load. The board carries MSI’s signature military-inspired design, offering both reliability and style for modern PC builds.

Key Features:

  • Supports AMD Ryzen™ 9000 / 8000 / 7000 Series Desktop Processors
  • Supports DDR5 Memory, Dual Channel DDR5 8200+ MT/s (OC)
  • Ultra Performance: 12+2+1 Duet Rail Power System, dual 8-pin CPU power connectors, Core Boost, Memory Boost, 8-layer PCB made by 2oz thickened copper material
  • Frozr Guard: Extended Heatsink, MOSFET thermal pads rated for 7W/mK, additional choke thermal pads and EZ M.2 Shield Frozr II are built for high performance system and non-stop experience
  • EZ DIY: EZ M.2 Shield Frozr II, EZ M.2 Clip II, EZ PCIe Release
  • Lightning Fast Game experience: PCIe 5.0 slot, Lightning Gen 5 x4 M.2
  • 20G USB Type-C & 5G LAN : the latest solution for professional and multimedia use, delivering secure, stable, and high-speed networking and data transmission
  • Audio Boost 5: Reward your ears with studio-grade sound quality for the most immersive gaming experience
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