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Green micro-ATX board with black heatsinks and silver socket

MSI

MSI MAG B365M MORTAR Micro ATX Intel motherboard

SKU CH-STWQ-J4DZD

Micro ATX board for 9th and 8th Gen Intel LGA 1151 CPUs with four DDR4 slots up to 64 GB, one PCIe 3.0 x16 slot, two PCIe 3.0 x1 slots, six SATA ports, one M.2 slot.

  • ProcessorSupports 9th/ 8th Gen Intel Core / Pentium Gold / Celeron pr
  • ChipsetIntel B365
  • Form factorMicro ATX
  • CPU socketLGA 1151
  • Memory slot count4 × 288pin (DDR4)
  • Supported memoryDDR4 2666/ 2400/ 2133 MHz
  • Supports 9th and 8th Gen Intel Core, Pentium Gold and Celeron CPUs on LGA 1151 socket
  • Four DDR4 slots accept up to 64 GB at 2666, 2400 or 2133 MHz in dual-channel mode
  • Single PCIe 3.0 x16 slot plus two PCIe 3.0 x1 slots for graphics and add-in cards
  • Six SATA 6 Gb/s ports with RAID 0, 1, 5, 10 plus one M.2 slot and Intel Optane ready
  • Realtek ALC892 7.1-channel audio and Intel I219-V LAN for wired networking

Socket LGA 1151 Micro-ATX board

The MSI MAG B365M MORTAR is a Micro-ATX motherboard built around the Intel B365 chipset for LGA 1151 processors. It accepts 8th and 9th generation Core, Pentium Gold and Celeron CPUs and fits cases that support the 9.6 by 9.6 inch form factor. Four 288-pin DDR4 slots provide dual-channel memory up to 64 GB at 2666, 2400 or 2133 MHz.

Builders needing compact expandability

This board suits builders who want a small footprint with a full-size PCIe 3.0 x16 slot, two PCIe 3.0 x1 slots, six SATA 6Gb/s ports and a single M.2 socket. The onboard Intel I219-V LAN and Realtek ALC892 7.1-channel audio cover networking and sound without extra cards. Users requiring multiple M.2 drives, integrated Wi-Fi or support for newer processor generations should consider other platforms.

Maximum 64 GB DDR4 capacity

The decisive specification is the 64 GB memory ceiling across four DDR4 slots. If the intended workload demands more than 64 GB of system memory, this motherboard cannot meet that requirement and a different chipset or form factor must be chosen.

How it compares

Measured against everything we stock in Motherboards for Intel CPUs, at today’s prices. Recalculated every night.

Price $68.99
Cheaper than about 70% of the 2,965 comparable items (median $97.99).

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Specifications

Product
Brand nameMSI
Processor
ProcessorSupports 9th/ 8th Gen Intel Core / Pentium Gold / Celeron processors for LGA 1151 socket
CPU socketLGA 1151
ChipsetIntel B365
Memory
Memory slot count4 × 288pin (DDR4)
Supported memoryDDR4 2666/ 2400/ 2133 MHz
Max supported RAM64 GB
Memory channelsDual Channel
Storage
SATA ports6 x SATA 6Gb/s
M.2 slots1 x M.2
Optane memory supportYes
SATA and RAID support0/1/5/10
Audio & video
Audio chipRealtek ALC892 Codec
Sound channels7.1 Channels
Connectivity
Ethernet controllerIntel I219-V
Ports & slots
PCIe 3.0 x16 slots1 x PCI Express 3.0 x16
PCIe x1 slots2 x PCIe 3.0 x1 slots
Onboard USB headers1 x USB 3.1 Gen1 connector (supports additional 2 USB 3.1 Gen1 ports)
2 x USB 2.0 connectors (support additional 4 USB 2.0 ports)
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in

Questions about this item

Will this board fit in my micro ATX case?

The board measures 9.6 inches by 9.6 inches and uses the micro ATX form factor so it fits any case that accepts that size.

Which memory kits work with the four DDR4 slots?

The four 288 pin slots support DDR4 at 2666, 2400 or 2133 MHz in dual channel up to 64 GB total.

Can I add a fast M.2 drive and still keep my SATA drives?

One M.2 slot is available alongside six SATA 6Gb/s ports and RAID 0, 1, 5, 10 so you can run both types together.

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