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Black Micro-ATX motherboard with silver heatsinks and four DDR4 slots

MSI

MSI B450M Mortar Max SATA 6Gb/s USB 3.1 HDMI AMD motherboard

SKU CH-SPC0-CSPMV

Micro-ATX AM4 board with four DDR4 slots up to 128 GB, dual PCIe 3.0 x16, two M.2, four SATA 6Gb/s, USB 3.2 Gen 2 Type-C, HDMI, DisplayPort and 7.1 audio

  • CPU Socket TypeAM4
  • CPU TypeRyzen Series
  • ChipsetAMD B450
  • Number of Memory Slots4x288pin (DDR4)
  • Memory Standard1866/ 2133/ 2400/ 2667Mhz (by JEDEC)For AMD Ryzen Gen3 (R5/R
  • Maximum Memory Supported128GB
  • Supports up to 128GB DDR4 memory with four 288-pin slots
  • Dual-channel architecture boosts bandwidth for Ryzen series processors
  • Two PCI Express 3.0 x16 slots enable multi-GPU configurations
  • Four SATA 6Gb/s ports plus two M.2 sockets provide flexible storage options
  • Realtek RTL8111H-CG LAN delivers 1Gbps wired connectivity

AM4 Micro-ATX board for Ryzen builds

The MSI B450M Mortar Max uses the AMD B450 chipset and an AM4 socket to support Ryzen Series processors. Four DDR4 slots accept up to 128GB of memory in dual-channel mode. Two full-length PCIe 3.0 x16 slots and two PCIe x1 slots provide expansion room. Four SATA 6Gb/s ports and two M.2 connectors handle storage. Realtek RTL8111H-CG LAN delivers 1Gbps networking. Rear I/O includes DisplayPort, HDMI, PS/2, USB 3.2 Gen 2 Type-C, six USB 2.0 ports and 7.1-channel audio jacks.

Straightforward install with common pitfalls

Standard Micro-ATX mounting holes align with most cases. The 24-pin and 8-pin CPU power connectors sit in usual positions. Four 288-pin DDR4 slots use single-sided latches; press modules firmly until they click. M.2 drives secure with a single screw each — do not overtighten. SATA cables route cleanly along the board edge. The I/O shield comes pre-installed. Remember to update the BIOS before installing newer Ryzen CPUs, otherwise the system will not post.

Suits compact Ryzen systems.

This board fits builders wanting a small-footprint Ryzen platform with dual x16 slots for a single graphics card and extra PCIe devices. The 128GB memory ceiling covers most workloads. Users planning heavy multi-GPU arrays or high-core-count CPUs with sustained all-core loads should consider boards with stronger VRM cooling and additional PCIe lanes. The single 1Gbps LAN port limits network throughput for server-style tasks.

Highlights

  • Supports up to 128GB DDR4 memory with four 288-pin slots
  • Dual-channel architecture boosts bandwidth for Ryzen series processors
  • Two PCI Express 3.0 x16 slots enable multi-GPU configurations
  • Four SATA 6Gb/s ports plus two M.2 sockets provide flexible storage options
  • Realtek RTL8111H-CG LAN delivers 1Gbps wired connectivity

Specifications

BrandMSI
ModelB450M MORTAR MAX
CPU Socket TypeAM4
CPU TypeRyzen Series
ChipsetAMD B450
Number of Memory Slots4x288pin (DDR4)
Memory Standard1866/ 2133/ 2400/ 2667Mhz (by JEDEC)For AMD Ryzen Gen3 (R5/R7/R9)2667/ 2800/ 2933/ 3000/ 3066/ 3200/ 3466/ 3733/ 3866/ 4000/ 4133 MHz (by A-XMP OC MODE)For AMD Other CPU2667/ 2800/ 2933/ 3000/ 3066/ 3200/ 3466 MHz (by A-XMP OC MODE)
Maximum Memory Supported128GB
Channel SupportedDual Channel
PCI Express 3.0 x162 x PCI Express 3.0 x16
PCI Express x12 x PCI Express x1
Serial ATA (SATA)4 x SATA 6Gb/s
M.22 x M.2
SATA RAID0/1/10
Audio Channels7.1 Channels
LAN Chipset1x Realtek RTL8111H-CG
Max LAN Speed1Gbps
Back I/O Ports1 x DisplayPort / 1 x HDMI / 1 x LAN (RJ45) / 1 x PS/2 / 1 x USB 3.2 Gen 2 Type-C / 5 x Audio Jacks / 6 x USB 2.0/1.1
PS/21 x PS/2 keyboard/mouse port
HDMI1 x HDMI
RJ451 x RJ45
DisplayPort1 x DisplayPort
USB 3.16 x USB 3.1
USB 1.1/2.06 x USB 2.0
USB Type-C1 x USB 3.1
S/PDIF Out1 x Optical
Audio Ports5 Ports
Onboard USB2 x USB 2.0
Form FactorMicro ATX

Questions about this item

How can I confirm the B450M Mortar Max is posting correctly after I install a Ryzen CPU and DDR4 memory?

Power on the system and watch for the BIOS splash screen or listen for a single beep; the board will initialise the AM4 socket and the four 288-pin DDR4 slots automatically.

What accessories come with the B450M Mortar Max and what must I purchase separately?

The motherboard ships with the I/O shield, SATA cables and documentation; you still need a Ryzen AM4 processor, DDR4 modules, a graphics card or APU for video, storage drives and a power supply.

Which memory speed should I target for the B450M Mortar Max — JEDEC 2667 MHz or A-XMP 3200 MHz?

JEDEC 2667 MHz works out of the box on any supported Ryzen; enable A-XMP in BIOS to run validated kits at 3200 MHz for higher bandwidth.

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