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MSI B450M Mortar Max micro ATX motherboard, dark PCB with silver heatsinks

MSI

MSI B450M Mortar Max 128GB AMD motherboard

SKU CH-9VRB-H81XE

Micro-ATX board with AMD B450 chipset and AM4 socket supports Ryzen processors and up to 128 GB DDR4 memory

  • CPU Socket TypeSocket AM4
  • CPU TypeAMD Ryzen 1st, 2nd, and 3rd generation processors with AM4 i
  • ChipsetAMD B450
  • Memory StandardSupport Dual DDR4 1866/2133/2400/2667/2800/2933/3000/3066/32
  • Maximum Memory Supported128GB
  • PCI Slots1 x PCIe 3.0 x16 (PCI_E1) Support x16 speed when using 1st,
  • Supports up to 128GB DDR4 for heavy multitasking
  • Dual-channel DDR4 up to 4133MHz for fast memory performance
  • Socket AM4 fits Ryzen 1st, 2nd and 3rd generation CPUs
  • PCIe 3.0 x16 slot runs at x16 speed with Ryzen processors
  • Realtek ALC892/ALC897 delivers 7.1 channel high-definition audio

Micro-ATX board for Ryzen builds

The MSI B450M Mortar Max is a Micro-ATX motherboard built around the AMD B450 chipset and Socket AM4. It accepts first, second and third generation Ryzen CPUs, including models with integrated Radeon graphics. Four DIMM slots support dual-channel DDR4 up to 128GB total capacity.

Sustained load behaviour with PCIe scaling

The single PCIe 3.0 x16 slot runs at x16 speed with standard Ryzen processors but drops to x8 when a first or second generation APU is installed. This lane reduction affects graphics cards and high-bandwidth add-in cards during prolonged workloads. The VRM heatsink array helps maintain stable power delivery during extended sessions.

Interface limits on storage and USB

Two M.2 sockets and four SATA III ports share chipset bandwidth, so populating both M.2 drives can reduce available SATA ports. Rear I/O provides one USB 3.2 Gen2 Type-C and one Type-A at 10Gbps, plus two USB 2.0 ports. Internal headers add two USB 3.2 Gen1 and four USB 2.0 connections. Gigabit LAN uses a Realtek RTL8111H controller.

Puntos fuertes

  • Supports up to 128GB DDR4 for heavy multitasking
  • Dual-channel DDR4 up to 4133MHz for fast memory performance
  • Socket AM4 fits Ryzen 1st, 2nd and 3rd generation CPUs
  • PCIe 3.0 x16 slot runs at x16 speed with Ryzen processors
  • Realtek ALC892/ALC897 delivers 7.1 channel high-definition audio

Especificaciones

BrandMSI
SeriesMSI B450M MORTAR MAX
ModelMSI B450M MORTAR MAX
CPU Socket TypeSocket AM4
CPU TypeAMD Ryzen 1st, 2nd, and 3rd generation processors with AM4 interface/Ryzen 1st and 2nd generation processors with built-in Radeon graphics/Ryzen desktop processors with built-in Radeon graphics
ChipsetAMD B450
Memory StandardSupport Dual DDR4 1866/2133/2400/2667/2800/2933/3000/3066/3200/3466 /3733/3866/4000/4133MHz memory
Maximum Memory Supported128GB
PCI Slots1 x PCIe 3.0 x16 (PCI_E1)
Support x16 speed when using 1st, 2nd, and 3rd generation AMD Ryzen processors
Support x8 speed when using Ryzen processors with built-in Radeon graphics cards in the 1st and 2nd generations
Supports x4 speed when using a built-in Radeon graphics card with a Raptor processor
1 x PCIe 2.0 x16 (PCI_E4, x4 mode supported) 1
2 x PCIe 2.0 x1
SATA RAID2XM.2 interface, 4xSATA III interface
Audio ChipsetRealtek ALC892/ALC897 Codec
7.1 channel high definition audio
Supports S/PDIF output
LAN Chipset1 x Realtek RTL8111H-CG Gigabit network interface card
Onboard USBAMD B450 chipset
Back 1 x USB 3.2 Gen2 (10Gbps) Type-C
Back 1 x USB 3.2 Gen2 (10Gbps) Type-A
2 x USB 3.2 Gen1 via internal USB 3.2 Gen1 connector
6 x USB 2.0 (2 Type-A on the back, 4 via internal USB 2.0 connectors)
AMD processor
Back 4 x USB 3.2 Gen1 Type-A

Preguntas sobre este artículo

How much power does the B450M Mortar Max draw when the system runs all day?

The board itself does not publish a power-draw figure; total consumption depends on the Ryzen CPU, DDR4 kit, graphics card and storage you install.

Which components must I already own for this Socket AM4 board to post?

You need a compatible Ryzen processor, at least one DDR4 module, a graphics card or a Ryzen APU with integrated Radeon graphics, a PSU with 24-pin ATX and 8-pin EPS connectors, and a cooler that fits the AM4 mounting holes.

Will my existing SATA SSDs and hard drives work alongside the B450 chipset?

Yes, the board provides four SATA III ports so any 2.5-inch or 3.5-inch SATA drive connects directly without adapters.

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