MSI PRO A620M-B vs PRO B840M-B Motherboard Comparison

MSI PRO A620M-B and MSI PRO B840M-B are both motherboards with the same Socket (AM5), Form factor (Micro ATX) and PCI-Express x16 Slots (1). The main differences are in Chipset, Supported Memory, M.2 Ports and M.2 Devices support.

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MSI PRO A620M-B	MSI PRO B840M-B
Prices (Change region) - Buy now	Prices (Change region) Out of Stock $126.08 Last updated 33 minutes ago. In Stock Free shipping $129.99 In Stock Free shipping $129.99 In Stock Free shipping $257.06 Show 1 more offers
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Brand MSI	Brand MSI
Model PRO A620M-B 7E28-017R	Model PRO B840M-B 7E76-002R
Release Date 📅 December 2024	Release Date 📅 June 2025
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews Add a product review
Price history View Details ►	Price history View Details ►
Compatible PC parts Processors ► Memory ► Cases ► CPU Coolers ►	Compatible PC parts Processors ► Memory ► Cases ► CPU Coolers ►
Socket AM5	Socket AM5
Form factor Micro ATX	Form factor Micro ATX
Chipset AMD A620	Chipset AMD B840
Supported Memory DDR5 4800Mhz 5000Mhz 5200Mhz 5400Mhz 5600Mhz 5800Mhz 6000Mhz 6200Mhz 6400Mhz 6600Mhz 6800Mhz	Supported Memory DDR5 4800Mhz 5600Mhz 7200Mhz 8000Mhz
* High clock speeds may require enabling the XMP profile in the motherboard BIOS ** RAM support may also depend on the CPU memory controller
ECC RAM Support No	ECC RAM Support No
LAN Chipset -	LAN Chipset Realtek 8125 2.5G LAN
Max LAN Speed -	Max LAN Speed 2.5Gbps
SLI Support No	SLI Support No
CrossFire Support No	CrossFire Support No
RAID Support Yes	RAID Support Yes
Back Connect No	Back Connect No
Back I/O Ports -	Back I/O Ports 1x Clear CMOS Button 1x Flash BIOS Button 1x VGA 1x HDMI 1x 2.5G LAN 4x USB 5Gbps Type-A 2x USB 2.0 3x Audio Connectors.
Wireless LAN No	Wireless LAN No
PCI-Express x16 Slots 1	PCI-Express x16 Slots 1
PCI-Express x4 Slots 0	PCI-Express x4 Slots 0
PCI-Express x1 Slots 1	PCI-Express x1 Slots 1
SATA 6 Gbps Ports 4	SATA 6 Gbps Ports 4
SATA Express Ports 0	SATA Express Ports 0
M.2 Ports 1	M.2 Ports 2
M.2 Devices support 2260 / 2280 - M Key	M.2 Devices support 2260 / 2280 - M Key 2260 / 2280 - M Key
RAM Slots 2	RAM Slots 2
Maximum Supported RAM 128 GB	Maximum Supported RAM 128 GB
Onboard USB 2.0 2	Onboard USB 2.0 2
Onboard USB 3.2 Gen 1 1	Onboard USB 3.2 Gen 1 1
Onboard USB 3.2 Gen 2 0	Onboard USB 3.2 Gen 2 1
Onboard USB 3.2 Gen 2x2 0	Onboard USB 3.2 Gen 2x2 0