Asus Prime Z390-A vs Prime B550M-A Motherboard Comparison

Asus Prime Z390-A and ASUS Prime B550M-A are both motherboards with the same M.2 Ports (2), M.2 Devices support (2242 / 2260 / 2280 / 22110 - M Key, 2242 / 2260...) and RAM Slots (4). The main differences are in Socket, Form factor, Chipset and Supported Memory.

Save comparison

Asus Prime Z390-A	ASUS Prime B550M-A
Prices (Change region) In Stock $179.99 Out of Stock + $29.99 Shipping $257.36 - Buy now	Prices (Change region) In Stock Free shipping $153.52
* Pangoly may earn a commission when you use one of the links to make a purchase. (Disclosure) * Product prices and availability are subject to change frequently. Any price and availability information displayed on Amazon at the time of purchase will apply.
Brand Asus	Brand ASUS
Model Prime Z390-A 90MB0YT0-M0AAY0	Model PRIME B550M-A 90MB14D0-M0AAY0 90MB14I0-M0EAY0
Release Date 📅 October 2018	Release Date 📅 June 2020
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews ★★★★☆ (109 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 LGA1151	Socket AM4
Form factor ATX	Form factor Micro ATX
Chipset Intel Z390	Chipset AMD B550
Supported Memory DDR4 2133Mhz 2400Mhz 2666Mhz 2800Mhz 3000Mhz 3200Mhz 3300Mhz 3333Mhz 3400Mhz 3466Mhz 3600Mhz 3733Mhz 3866Mhz 4000Mhz 4133Mhz 4266Mhz	Supported Memory DDR4 2133Mhz 2400Mhz 2666Mhz 2800Mhz 3000Mhz 3200Mhz 3466Mhz 3600Mhz 3866Mhz 4000Mhz 4400Mhz
* 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 Realtek ALC S1220A High Definition Audio CODEC featuring Crystal Sound 3	Audio Chipset -
Audio Channels 8 Channels	Audio Channels -
LAN Chipset Intel I219-V	LAN Chipset -
Max LAN Speed 10/100/1000Mbps	Max LAN Speed -
SLI Support Yes	SLI Support No
CrossFire Support Yes	CrossFire Support No
RAID Support Yes	RAID Support Yes
Back Connect No	Back Connect No
Back I/O Ports 1 x PS/2 keyboard/mouse combo port(s) 1 x DisplayPort 1 x HDMI 1 x LAN (RJ45) port(s) 3 x USB 3.1 Gen 2 (teal blue) Type-A 1 x USB 3.1 Gen 2 Type-C 2 x USB 3.1 Gen 1 (blue) Type-A 2 x USB 2.0 1 x Optical S/PDIF out 5 x Audio jack(s)	Back I/O Ports -
Wireless LAN No	Wireless LAN No
PCI-Express x16 Slots 3	PCI-Express x16 Slots 1
PCI-Express x4 Slots 0	PCI-Express x4 Slots 0
PCI-Express x1 Slots 3	PCI-Express x1 Slots 2
SATA 6 Gbps Ports 6	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 / 22110 - 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 64 GB	Maximum Supported RAM 128 GB
Onboard USB 2.0 3	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
	-