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Micro-ATX board in dark grey with black heatsinks and four memory slots

MSI

MSI B450M Mortar Max AMD motherboard

SKU CH-V8S6-PR8ZF

Micro-ATX AM4 board with four DDR4 slots up to 128 GB, two M.2 sockets, four SATA 6Gb/s ports, PCIe 3.0 x16 Steel Armor slot, 7.1 audio and Gigabit LAN

  • CPU Socket TypeAM4
  • CPU TypeRyzen Series
  • ChipsetAMD B450
  • Number of Memory Slots4x288pin (DDR4)
  • Memory StandardSupports 1866/ 2133/ 2400/ 2667Mhz (by JEDEC) For AMD Ryzen
  • Maximum Memory Supported128GB
  • Supports up to 128 GB DDR4 for heavy multitasking
  • Four 288-pin slots simplify memory upgrades
  • Dual M.2 slots enable fast storage expansion
  • PCIe 3.0 x16 Steel Armor protects heavy graphics cards
  • 1-channel audio delivers clear positional sound

Socket AM4 foundation

The MSI B450M Mortar Max is a Micro ATX motherboard built around the AMD B450 chipset for Ryzen processors using the AM4 socket. It targets DIY builders who want a compact board with four DDR4 slots and dual M.2 capacity. The layout supports up to 128 GB of system memory across four 288-pin slots.

Build integration

One full-length PCIe 3.0 x16 slot runs at x16 speed with Ryzen CPUs and drops to x8 or x4 with APUs. A second PCIe 2.0 x16 slot operates at x4 mode alongside two PCIe 2.0 x1 slots. Four SATA 6 Gb/s ports and two M.2 sockets handle storage while the rear I/O supplies HDMI, DisplayPort, USB 3.2 Gen 2 Type-C, six USB 2.0 ports, PS/2 and 7.1-channel audio.

Thermals and power

Heavy heatsinks cover the voltage regulator area to dissipate heat during sustained loads. Multiple fan headers with full speed control let builders tune airflow for the CPU and surrounding components. The 1 Gbps LAN controller and integrated audio operate within the board's standard power envelope without requiring auxiliary connectors beyond the main ATX and CPU power inputs.

Points forts

  • Supports up to 128 GB DDR4 for heavy multitasking
  • Four 288-pin slots simplify memory upgrades
  • Dual M.2 slots enable fast storage expansion
  • PCIe 3.0 x16 Steel Armor protects heavy graphics cards
  • 1-channel audio delivers clear positional sound

Caractéristiques

BrandMSI
ModelB450M MORTAR MAX
CPU Socket TypeAM4
CPU TypeRyzen Series
ChipsetAMD B450
Number of Memory Slots4x288pin (DDR4)
Memory StandardSupports 1866/ 2133/ 2400/ 2667Mhz (by JEDEC)
For AMD Ryzen Gen3 (R5/R7/R9)
Supports 2667/ 2800/ 2933/ 3000/ 3066/ 3200/ 3466/ 3733/ 3866/ 4000/ 4133 MHz (by A-XMP OC MODE)
For AMD Other CPU
Supports 2667/ 2800/ 2933/ 3000/ 3066/ 3200/ 3466 MHz (by A-XMP OC MODE)
Maximum Memory Supported128GB
Channel SupportedDual Channel
PCI Express 3.0 x161 x PCIe 3.0 x16 slot (PCI_E1)
Supports x16 speed with 1st, 2nd and 3rd Gen AMD Ryzen processors
Supports x8 speed with Ryzen with Radeon Vega Graphics and 2nd Gen AMD Ryzen with Radeon Graphics processors
Supports x4 speed with AMD Athlon with Radeon Vega Graphics Processors
PCI Express 2.0 x161 x PCIe 2.0 x16 slot (PCI_E4, supports x4 mode)
PCI Express x12 x PCIe 2.0 x1 slots
Serial ATA (SATA)4 x SATA 6Gb/s
M.22 x M.2
Audio Channels7.1 Channels
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 Factorm-ATX

Questions sur cet article

Will the VRM heatsink keep temperatures in check when the CPU draws full load all day?

The board uses a solid heatsink on the power phases and provides multiple fan headers with full speed control so you can direct airflow over the VRM area during sustained workloads.

How loud does the system get when the board runs 24/7 with all headers populated?

Fan headers support PWM and DC modes so each connected fan can run at low RPM under light load and ramp up only when temperatures rise keeping overall noise low.

Which DDR4 modules do I need to populate the four 288-pin slots and reach 128 GB?

Four 32 GB DDR4 DIMMs running at any JEDEC speed from 1866 to 2667 MHz or at A-XMP frequencies up to 4133 MHz will fill the slots and hit the 128 GB maximum.

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