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Dark green micro-ATX motherboard with silver heatsinks, black PCB, LGA 1700 socket, four DDR5 slots, two full-length PCIe slots

MSI

MSI MAG B660M MORTAR WIFI DDR5 Intel motherboard

SKU CH-MN4Z-HBHHX

Micro-ATX Intel B660 board with LGA 1700 socket, dual-channel DDR5 memory up to 128 GB, 2.5 Gb LAN, Wi-Fi and USB 3.2 Gen 2x2 20 Gbps Type-C

  • CPU Socket TypeLGA 1700
  • CPU TypeSupports 12th Gen Intel Core™, Pentium Gold and Celeron proc
  • ChipsetIntel B660
  • Memory StandardSupport dual-channel DDR5 5200 and above MHz memory
  • Maximum Memory Supported128GB
  • PCI Slots2x PCIe x16 slots PCI_E1 slot (From CPU) Supports PCIe 4.0 x
  • Supports 12th Gen Intel Core processors on LGA 1700 socket
  • Dual-channel DDR5 memory up to 5200 MHz and 128 GB capacity
  • 5 Gbps LAN with Realtek 8125BG controller for fast wired networking
  • 1-channel audio via Realtek ALC1200 codec with S/PDIF output
  • USB 3.2 Gen2x2 20 Gbps Type-C port on rear I/O panel

MAG B660M Mortar DDR5 foundation

This Micro ATX board pairs the Intel B660 chipset with an LGA 1700 socket for 12th Gen Core, Pentium Gold and Celeron CPUs. It targets builders who want a compact foundation for DDR5 memory and modern I/O without a full ATX footprint.

Bundled back-panel and cabling

A CMOS battery, one SATA cable and the chassis I/O shield are included so the board can be installed and powered immediately. The Wi-Fi antenna is also supplied because the module is integrated on the PCB. No additional accessories or software media are provided.

B660 chipset lane limits

The chipset provides a PCIe 3.0 x4 link to the second x16 slot and a single PCIe 3.0 x1 slot, capping add-in bandwidth on those lanes. Six SATA III ports and two M.2 interfaces share the remaining chipset resources, so populating every drive connector can saturate the available throughput.

Highlights

  • Supports 12th Gen Intel Core processors on LGA 1700 socket
  • Dual-channel DDR5 memory up to 5200 MHz and 128 GB capacity
  • 5 Gbps LAN with Realtek 8125BG controller for fast wired networking
  • 1-channel audio via Realtek ALC1200 codec with S/PDIF output
  • USB 3.2 Gen2x2 20 Gbps Type-C port on rear I/O panel

Specifications

BrandMSI
SeriesMSI MAG B660M MORTAR WIFI DDR5
ModelMSI MAG B660M MORTAR WIFI DDR5
CPU Socket TypeLGA 1700
CPU TypeSupports 12th Gen Intel Core™, Pentium Gold and Celeron processors
Processor socket LGA1700
ChipsetIntel B660
Memory StandardSupport dual-channel DDR5 5200 and above MHz memory
Maximum Memory Supported128GB
PCI Slots2x PCIe x16 slots
PCI_E1 slot (From CPU)
Supports PCIe 4.0 x16
PCI_E3 slot (From B660 Chipset)
Supports PCIe 3.0 x4
1x PCIe 3.0 x1 slot
SATA RAID2XM.2 interface, 6xSATA III interface
Audio ChipsetRealtek ALC1200 Codec
7.1-Channel High Definition Audio
Supports S/PDIF output
LAN Chipset1x Realtek 8125BG 2.5Gbps LAN controller
Onboard USBIntel B660 Chipset
1x USB 3.2 Gen2x2 20Gbps Type-C port on the back panel
1x USB 3.2 Gen 2 10Gbps Type-C port available through the internal connector
2x USB 3.2 Gen 1 5Gbps ports available through the internal connector
4x USB 2.0 ports on the back panel
USB Hub-GL3590
3x USB 3.2 Gen 2 10Gbps Type-A ports on the back panel
USB Hub-GL850G
4x USB 2.0 ports available through internal connectors

Questions about this item

Will the CMOS battery need replacing during the board's life?

The package includes a CMOS battery; replacement is only needed when the system clock loses time after power-off.

Which slot limits GPU bandwidth first under heavy load?

The PCI_E3 slot runs at PCIe 3.0 x4 from the B660 chipset, so a card installed there hits that ceiling before the CPU-linked x16 slot.

How hot or loud does the VRM area get during all-day workloads?

The board uses a heatsink-covered VRM design with no active fan, so noise stays at case-fan level and temperatures depend on chassis airflow.

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