MAG B850M MORTAR is designed for gamers with a stable, durable and DIY friendly foundation for their PC builds. Coming up with 5G LAN, USB 20Gbps, PCIe 5.0 solutions, Supplemental PCIe Power, and exclusive EZ DIY features, it's ready for the battlefield of AMD Ryzen™ 9000 series processors.
Less steps, control easily
12+2+1 Duet Rail Power System 60A SPS
Extended Heatsink Design
EZ M.2 Shield Frozr II
USB20G Type-C connection & 5G LAN
Easy One-Click overclock
New and Optimized UI / UX design
MSI's mainstream MAG series epitomizes stability and durability and is built to withstand the most intense gaming sessions. The entire lineup features robust construction with metallic-like hardness and excellent heat dissipation, ensuring stability for all critical gaming components.
Learn more >
EXCLUSIVE FEATURES
Pre-Installed I/O Shield
EZ M.2 Shield Frozr II
EZ Conn Design
12+2+1 Duet Rail Power System with 60A SPS
EZ PCIe Release
Steel Armor II
PCIe Supplemental Power
Premium thermal solution
Extended Heatsink
8-Layer PCB
with 2oz Thickened Copper
Pump Fan Support
Heatsink with 7W/mK Thermal Pad
HIGH-SPEED TRANSMISSION
5G LAN
USB 20G
2x PCIe 5.0 M.2 Slots
Memory Boost
Lightning Gen 5
EZ DIY
- ONE-FINGER
- ONE HAND
- ONE STEP
- ONE GLANCE
- ONE CLICK
- EZ M.2 INSTALLATION
- EZ GPU INSTALLATION
- EZ BUTTON
MSI’s exclusive EZ M.2 Shield Frozr II and EZ M.2 CLIP II make M.2 installation seamless. Insert the SSD card into the slot and press it down to lock it in place with the clip. As fasten the SSD, flick the clip outwards and then the SSD is removed. The process is smooth, and you don’t need to use your tools like before. One finger can give you perfect DIY experience.
Introducing MSI’s EZ M.2 CLIP II Remover, a handy tool designed to simply switching or repositioning the EZ M.2 CLIP II on your motherboard. This tool allows users to effortlessly detach the EZ M.2 CLIP II from the motherboard and reattach it to any desired M.2 slot. It is included in the accessory kit that comes with MSI motherboards.
EZ PCIe Release
An easy-to-access physical button release mechanism that can help remove any PCIe card with a single tap, making it much easier to upgrade to a new GPU or other compatible device, streamlining the entire process and enhancing user experience.
MORE FOR DIY FRIENDLY
CPU and memory not required. Leam more
- EZ Mounting
EZ MOUNTING
MSI motherboards circuitry ensure the case standoff keep out zones are pure and clean. Moreover, the protective paint is printed around each screw hole to prevent parts from being scratched or damaged to the motherboard.
Avoid Collision Notification
Keep Out Zone
Double ESD Protection
- EZ Front Panel Cable
- DRIVER UTILITY INSTALLER
This cable takes care of the tedious part of the build process, makes motherboard front panel connections quickly and accurately.
MSI DRIVER UTILITY INSTALLER
Once connected to the internet, MSI Driver Utility Installer will detect and present suitable drivers and utilities automatically, you can download and install with just a few clicks. Learn more
*Please ensure to connect the internet, or the Driver Utility Installer won’t launch automatically.
*MSI Driver Utility Installer will be ready in Windows 11 build 22H2.
- EZ Optimization
A host of features inject artificial intelligence into key aspects of your computing experience to make smarter, real-time optimizations. The MSI Center offers a clean, minimal interface to customize and manage your PC settings. The AI Engine, for example, automatically adjusts settings based on the applications you're using, ensuring seamless performance.
ULTRA PERFORMANCE
- memory
- PROTECTION
- TVS
- SOLID PIN DESIGN
- STAINLESS STEEL IO
- OCP Protection
- GROUNDING STRUCTURE
Transient Voltage Suppressors (TVS)
Transient Voltage Suppressors (TVS) are safety devices used to protect against excessive voltage. All motherboard models of MSI are equipped with TVS. When the voltage abnormally rises, the TVS switches from a high-resistance state to a low-resistance state, diverting the excessive voltage to ground. This helps prevent circuit damage caused by high voltage.
solid pin design
The 4-pin, 8-pin, and 24-pin power connectors of MSI motherboards are all designed with solid pins. The solid pin design allows for a more stable transmission of 12V power to the CPU, even when handling high current loads.
Advantages of Solid Pin Power connector
- Improved stability : Larger contact area enhances stability during power delivery.
- Low impedance : Solid pins offer low impedance, enabling efficient power flow.
- Strong durability : The solid pin design ensures strong durability, capable of withstanding demanding conditions.
- Suitable for high-current applications.
Anti-corrosive Stainless Steel IO Shield
An extra layer of sponge materials along with corrosive resistance IO Shield to help improve static electricity and reduce electromagnetic radiation noise from the system as well as much more durable compare to traditional IO Shields.
* The image above is an illustrative reference. Please refer to specification pages for more details.
Over Current Protection
MSI motherboards prioritize safety with the embedded Overcurrent Protection (OCP), ensuring crucial components such as the USB ports, DDR memory, PWM IC, and CPU are shielded from excessive current. This proactive defense mechanism curtails the risk of damage or malfunction due to power surges, promoting long-term system stability. This commitment to safeguarding your hardware underscores MSI's dedication to producing motherboards that prioritize durability and stability.
The Grounding Structure of Power Phases
The grounding structure of power phases is the MSI's exclusive design. This patented design enables to suppress the electromagnetic interference (EMI) generated by the power phases and helps to efficiently conduct heat to the copper plane with grounding properties.
FROZR DESIGN
- FROZR GUARD
- FROZR SYNC
- FROZR CONTROL
- COOLING WIZARD
- FROZR AI COOLING
- AUTO DETECT FAN
Cooling Wizard serves as a comprehensive solution for managing fan settings across all MSI products. It ensures superior cooling performance and noise reduction for your gaming PC, offering compatibility with PWM/DC fans and pumps, customizable options, and intuitive temperature monitoring for optimal operation with one click.
Frozr AI Cooling targets CPU and GPU temperatures. The AI system detects CPU and GPU temperatures and automatically adjusts the fan duty of system fans to ensure optimal performance.
MSI fan headers automatically detect fans running in DC or PWM mode for optimal tuning of fan speeds and silence. Hysteresis also makes your fans spin up fluently to make sure your system stays silent, no matter what.
TRILINK
- networking
- storage
- Expansion
Experience
- audio
- mystic light
- BIOS
- Software
- Synchronized
EXTEND YOUR RGB EXPERIENCE WITH EASE
Add more color if you want! Mystic Light Extension pin header provides an intuitive way to control additional RGB strips and other RGB peripherals added to a system, without needing a separate RGB controller.
- MSI CENTER
- AIDA64
- NORTON 360
MSI CENTER
MSI brand new MSI Center unifies a suite of MSI software utilities into a single centralized application. Take control of advanced motherboards features and unleash endless possibilities.
Exclusive UI of AIDA64 Extreme
MSI motherboards provide 60 days free trial of AIDA64 Extreme - MSI edition. AIDA64 Extreme is an almighty application for system information, diagnostics and benchmarks. With the application, you can monitor the detailed hardware and software information on PC and save it to file in multiple formats such as CSV and HTML.
Opt-in to Cyber Safety with Norton 360 Deluxe
Multiple layers of protection for your devices, online privacy features including our Secure VPN, plus Dark Web Monitoring - all in a single solution. With MSI motherboards, you can enjoy a 60-day free trial of Norton 360 Deluxe.
- Up to 50 GB PC cloud backup
- Real time Threat protection and Smart Firewall
- Password manager
- PC SafeCam

The MSI trial offer is not available for existing Norton customers. If you have an active Norton subscription, you will need to opt-out of the existing subscription to be eligible for this offer. For Important Subscription, Pricing and Offer Details, please refer to NortonLifeLock License and Services Agreement. NortonLifeLock Product and Service Privacy Notices.
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
- 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