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Motherboard	$139⁹⁹	$113⁹⁹
Chipset	AMD B850	AMD B850
Socket	AM5	AM5
Form Factor	ATX	Micro ATX
Max Memory	256 GB	128 GB
Memory Type	DDR5	DDR5
Memory Slots	4	2
ECC Memory Support	No	No
PCIe x16 Slots	2	2
PCIe x16 4.0 Slots	2	2
PCIe x1 Slots	0	1
M.2 Slots	6	4
M.2 Slot Specifics	2280M (PCIe4.0x4) 2280M (PCIe4.0x4) 2230-2242M (PCIe4.0x4) 2280M (PCIe4.0x4) 2280M (PCIe4.0x4) 2280E (PCIe4.0x4)	2280M (PCIe4.0x4) 2260-2280M (PCIe4.0x4) 2280M (PCIe4.0x4) 2280E (PCIe4.0x4)
SATA Ports	4	0
USB 2.0 Headers	2	2
USB 3.2 Headers	2	1
USB 3.2 (Gen 2) Headers	0	1
WiFi	802.11 ax	802.11 ax
Ethernet Speed	2.5 Gbps	2.5 Gbps
Audio Chipset	Realtek	Realtek
Audio Channels	7.1	7.1
Optical S/PDIF Out	No	No
BIOS Flashback	No	No
Color	Dark	Light
Supported CPUs	AMD Ryzen 7000, 8000, 9000	AMD Ryzen 7000, 8000, 9000
M.2 Heatsink/Shields	Yes	-
	Amazon — Check Newegg — Check	Amazon — Check Newegg — Check

Comparison Analysis

Comparing the B850 Pro RS WiFi vs B850 M-X WiFi R2.0 reveals distinct differences in their targeted use cases.

The B850 M-X WiFi R2.0 is the more budget-friendly option, costing approximately $26 (23%) less than the B850 Pro RS WiFi.