Asus PRIME B860M-A-CSM vs PRIME B550M-A/CSM Motherboard Comparison

Asus PRIME B860M-A-CSM and ASUS PRIME B550M-A/CSM are both motherboards with the same Form factor (Micro ATX), SATA 6 Gbps Ports (4) and M.2 Ports (2). The main differences are in Socket, Chipset, Supported Memory and ECC RAM Support.

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Asus PRIME B860M-A-CSM	ASUS PRIME B550M-A/CSM
Prices (Change region) There are no offers available in your selected region. Other merchants are available in another region. In Stock Free shipping €117.03 In Stock Free shipping €146.32 In Stock Free shipping €146.42 In Stock Free shipping €154.72 In Stock + €4.99 Shipping €156.05 In Stock + €4.99 Shipping €156.08 In Stock Free shipping €164.00 Out of Stock Free shipping €170.87 Out of Stock + €4.99 Shipping €174.60 In Stock + €7.46 Shipping €176.24 Show 7 more offers	Prices (Change region) In Stock $109.99 In Stock Free shipping $314.36
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Brand Asus	Brand ASUS
Model PRIME B860M-A-CSM	Model PRIME B550M-A/CSM 90MB14I0-M0AAYC
Release Date 📅 January 2025	Release Date 📅 June 2020
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews ★★★★☆ (16 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 LGA1851	Socket AM4
Form factor Micro ATX	Form factor Micro ATX
Chipset Intel B860	Chipset AMD B550
Supported Memory DDR5 4800Mhz 8600Mhz	Supported Memory DDR4 2133Mhz 2400Mhz 2666Mhz 2800Mhz 3000Mhz 3200Mhz 3333Mhz 3466Mhz 3600Mhz 3733Mhz 3866Mhz 4000Mhz 4133Mhz 4266Mhz 4400Mhz 4600Mhz
* 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 Yes * ECC memory support also depends on the CPU memory controller
Audio Chipset -	Audio Chipset Realtek ALC887
Audio Channels -	Audio Channels 7.1 Channels
LAN Chipset -	LAN Chipset Realtek RTL8111H
Max LAN Speed -	Max LAN Speed 10/100/1000Mbps
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 2 x USB 3.2 Gen 2 ports (2 x Type-A) 4 x USB 3.2 Gen 1 ports (4 x Type-A) 1 x D-Sub port 1 x DVI-D port 1 x HDMI port 1 x Realtek RTL8111H 1Gb Ethernet port 3 x Audio jacks 1 x PS/2 Keyboard/Mouse combo port
Wireless LAN No	Wireless LAN No
PCI-Express x16 Slots 2	PCI-Express x16 Slots 1
PCI-Express x4 Slots 0	PCI-Express x4 Slots 0
PCI-Express x1 Slots 1	PCI-Express x1 Slots 2
SATA 6 Gbps Ports 4	SATA 6 Gbps Ports 4
SATA Express Ports 0	SATA Express Ports 0
M.2 Ports 2	M.2 Ports 2
M.2 Devices support 2242 / 2260 / 2280 - M Key 2242 / 2260 / 2280 - M Key	M.2 Devices support 2242 / 2260 / 2280 / 22110 - M Key 2242 / 2260 / 2280 - M Key
RAM Slots 4	RAM Slots 4
Maximum Supported RAM 256 GB	Maximum Supported RAM 128 GB
Onboard USB 2.0 1	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 1	Onboard USB 3.2 Gen 2 0
Onboard USB 3.2 Gen 2x2 0	Onboard USB 3.2 Gen 2x2 0