Holiday Shipping Details & Extended Holiday Returns 
MAG B550M MORTAR
This AMD motherboard from MSI unleashes the full potential of your 3rd Gen AMD Ryzen processors and supports future AMD Ryzen processors with BIOS update. Experience unprecedented speeds with PCI-E 4.0, Lightning Gen 4 M.2, and AMD Turbo USB 3.2 Gen 2. Coupled with designs to enhance cooling, prolong lifespan, and protect components, it is a go-to choice for your next gaming powerhouse.
2.5G LAN
Featuring 2.5G LAN with LAN manager delivers better network experience.
Turbo USB
Featuring the Turbo USB 3.2 Gen 2 10Gbps with reversible Type-C connector.
DDR4 Boost
The fully isolated DDR circuit to deliver pure data signals for the best gaming and overclocking performance.
Lightning Gen 4 Solution
The latest Gen 4 PCI-E and M.2 solution with up to 64GB/s bandwidth for maximum transfer speed.
Extended Heatsink
MSI extended heatsink and enhanced circuit design ensures even high-end processors to run in full speed.
M.2 Shield Frozr
Strengthened built-in M.2 thermal solution. Keeps M.2 SSDs safe while preventing throttling, making them run faster.
Pump Fan Support
Control water cooling pump speeds for best flow and noise control.
Heatsinks with 7W/mK Thermal Pad
7W/mK thermal pad provides better heat transfer to the heatsink.
Core Boost Technology
With premium layout design, that is ready for unleashing the maximum performance.
2oz Thickened Copper
4-layer PCB with 2oz thickened copper provides higher performance and long-lasting system stability without any compromise.
Digital PWM
Highest quality component digital power IC makes sure your system runs smoothly under the most extreme conditions.
PCIe Steel Armor
Protecting VGA cards against bending and EMI for better performance, stability and strength.
OPTIMIZED FOR WATER COOLING
Designed to support the most popular All-In-One & customized water cooling solutions on the market. A dedicated water pump PIN header supports up to 3 amp, giving you full control of the water pump speed. A clearly marked 'keep-out-zone' allows for easy and safe installation and a perfect fit.
8 + 2 +1 DUET RAIL POWER SYSTEM
Unleash and sustain maximum performance with an aggressive VRM design built with a total of 8 digital CPU power phases. Combining exclusive Core Boost technology, MAG series motherboard is ready to sustain heavy gaming loadings.
LOAD-LINE CALIBRATION
What you set, is what you get. LLC makes sure your CPU voltage remains 100% stable under any load. This greatly improves stability when demanding more CPU performance.
OVERVOLTAGE PROTECTION
Prevents potential short-circuit damage to the CPU and other critical components.
DIGITALL POWER DESIGN
A fully digital power design allows for faster and undistorted current delivery to the CPU at pin-point precision. Creating the perfect conditions for CPU overclocking.
DEDICATED HIGH DEFINITION AUDIO PROCESSOR
Make sure you enjoy the purest sound quality in both stereo and surround sound.
HIGH QUALITY AUDIO CAPACITORS
A high fidelity sound experience with exceptional acoustics and realism for studio level headphones is ensured.
HIGH QUALITY AUDIO JACKS
Keep your sound perfect by transmit your audio with pure digital signal.
ISOLATED AUDIO DESIGN
Like a dedicated sound card, audio components and circuits have been laid on a reserved motherboard section and electrically isolated.
SEPARATED AUDIO LAYERS FOR CLEAN LEFT & RIGHT CHANNELS
Using separated layers in the PCB ensures equally pristine sound quality for both left and right audio channels.
EASY BIOS RECOVERY WITH FLASH BIOS BUTTON
Run into trouble when updating your BIOS? Simply flash the old BIOS version back and continue gaming within minutes with Flash BIOS Button. Flash BIOS Button even works without a CPU, memory or graphics card installed!
KEEP OUT ZONE
MSI motherboards circuitry ensure the case standoff keep out zones are pure and clean, preventing any component contact or damage to the motherboard. Please makes sure to remove the unnecessary mounting stand-off when installing the motherboard into the case.
XL Clip
The enlarged PCI-E clip helps you swap or remove your devices easier. Keep the PCI-E slot stronger and safer.
EZ Debug LED
Run into trouble? Onboard LEDs for key components will indicate the source of the problem so you know exactly where to look to get up and running again.
XL Clip
The enlarged PCI-E clip helps you swap or remove your devices easier. Keep the PCI-E slot stronger and safer.
Ultimate Motherboard Protection
Double ESD protection doubles up the grounding layer around the mounting holes, preventing static discharge surges from damaging the motherboard.
USB FRONT TYPE-C
MSI gaming motherboards support USB Front Type-C that allows gamers to connect with the latest USB devices. Built up a system with MSI PC case to have the most convenient experience.
Click BIOS 5
Get more from a loaded BIOS designed for ease of use. Fine-tune the motherboard for gaming performance, efficiency, or overclocking world records!
Dragon Center
MSI brand new Dragon Center unifies a suite of MSI software utilities into a single centralized application. Take control of advanced motherboards features and unleash endless possibilities.
MSI APP Player
Developed under an exclusive partnership with BlueStacks, the MSI APP Player brings seamless gaming experience between mobile games and PC platform, and leverages customized features as specific keyboard lighting and better graphics with multi-task works.