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MSI · MODEL REFERENCE

B450M MORTAR MAX

The right downloads. A clearer view of your board.

AM4AMD B450DDR4

What do you need?

DriversChoose your operating system and device. BIOS & firmwareRead version notes and the update procedure. CPU supportCheck your processor and required BIOS. ManualsOpen the manufacturer documentation.

All downloads open on MSI’s website. Select the matching category if the site opens its default tab. MoboDocs does not host installers or BIOS files.

Match the complete model name and PCB revision before downloading. DDR4/DDR5, Wi-Fi, MAX and II variants can use different files.

Specifications & model notes

Form factor
Micro ATX
Memory slots
4
M.2 storage slots
2
SATA ports
4

Physical connector counts do not guarantee simultaneous use. Check processor and lane-sharing limits in the specification.

Installing an SSD in M2_2 makes PCI_E4 unavailable. M2_2 uses PCIe 2.0 x4; M2_1 supports PCIe or SATA storage. Download firmware for the MAX variant.

Original documentation

Manufacturer support & documentationChoose the matching manual, revision and language.
Open source ↗
Specifications & compatibilityCheck CPU support, memory and expansion limits.
View details ↗
Official product photosView the manufacturer’s gallery and compare the exact model.
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Helpful starting points

Each guide states its scope. General checklists are not hardware tests of this particular model.

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Storage troubleshooting · 3 min read

MSI B450M MORTAR MAX: PCI_E4 stops working after M.2

Why an SSD in M2_2 disables PCI_E4 on the B450M MORTAR MAX, and how to plan storage and expansion cards around that limit.

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Connectors & assembly · 4 min read

Connect your case’s front-panel cables

Identify the power switch, reset switch, and indicator LEDs using the correct header map.

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Storage & expansion · 4 min read

Will an M.2 SSD disable another port?

Read slot-sharing notes before adding an SSD or expansion card.

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Identify your board · 3 min read

How to find your motherboard model and revision

Read the board identity in Windows, then distinguish the product name, hardware revision and BIOS version.

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Drivers & setup · 3 min read

Where to download motherboard drivers

Find chipset, network and audio drivers for the exact board and operating system, including a plan for a PC without internet.

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CPU & BIOS · 3 min read

Will this CPU work? Check the board and BIOS together

A matching socket is only the first check. Read the exact CPU support entry and required BIOS before replacing a processor.

Sources reviewed 2026-10-22 · Report a correction.