Asus PRIME B850M-A-CSM vs Prime B650M-A-CSM Motherboard Comparison

Asus PRIME B850M-A-CSM and ASUS Prime B650M-A-CSM are both motherboards with the same Socket (AM5), Form factor (Micro ATX) and SATA 6 Gbps Ports (4). The main differences are in Chipset, Supported Memory, PCI-Express x16 Slots and M.2 Ports.

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Asus PRIME B850M-A-CSM	ASUS Prime B650M-A-CSM
Prices (Change region) In Stock $169.99 In Stock Free shipping $169.99	Prices (Change region) In Stock $179.99 Out of Stock + $29.99 Shipping $196.73
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Brand Asus	Brand ASUS
Model PRIME B850M-A-CSM 90MB1LQ0-MUVAYC	Model PRIME B650M-A-CSM 90MB1C10-M0AAYC
Release Date -	Release Date 📅 December 2022
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews ★★★★☆ (1 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 ►
Series -	Series Prime
Socket AM5	Socket AM5
Form factor Micro ATX	Form factor Micro ATX
Chipset AMD B850	Chipset AMD B650
Supported Memory DDR5 4800Mhz 5200Mhz 5600Mhz 5800Mhz 6000Mhz 6200Mhz 6400Mhz 6600Mhz 6800Mhz 7000Mhz 7200Mhz 7400Mhz 7600Mhz 7800Mhz 8000Mhz	Supported Memory DDR5 4800Mhz 5000Mhz 5200Mhz 5400Mhz 5600Mhz
* 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
Audio Channels -	Audio Channels Realtek 7.1 Surround Sound High Definition Audio CODEC
Max LAN Speed -	Max LAN Speed 1 x Realtek 2.5Gb Ethernet
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) 2 x USB 3.2 Gen 1 ports (2 x Type-A) 4 x USB 2.0 ports (4 x Type-A) 1 x DisplayPort 1 x VGA port 1 x HDMI port 1 x Realtek 2.5Gb Ethernet port 3 x Audio jacks 1 x BIOS FlashBack button 1 x PS/2 Keyboard/Mouse combo port
Wireless LAN No	Wireless LAN No
PCI-Express x16 Slots 2	PCI-Express x16 Slots 3
PCI-Express x4 Slots 0	PCI-Express x4 Slots 0
PCI-Express x1 Slots 0	PCI-Express x1 Slots 0
SATA 6 Gbps Ports 4	SATA 6 Gbps Ports 4
SATA Express Ports 0	SATA Express Ports 0
M.2 Ports 3	M.2 Ports 2
M.2 Devices support 2280 - M Key 2280 - M Key 2242 / 2260 / 2280 - M Key	M.2 Devices support 2242 / 2260 / 2280 - 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 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 1	Onboard USB 3.2 Gen 2 1
Onboard USB 3.2 Gen 2x2 0	Onboard USB 3.2 Gen 2x2 0

Comparison and key differences summary

Reasons to buy the Asus PRIME B850M-A-CSM:

6% cheaper, you can save $10.00
Supports the following RAM types: DDR5 5800MHz, 6000MHz, 6200MHz, 6400MHz, 6600MHz, 6800MHz, 7000MHz, 7200MHz, 7400MHz, 7600MHz, 7800MHz, 8000MHz
+1 Ports M.2
+128 GB maximum RAM supported