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Motherboard
B850 Pro RS WiFi
ASRock
$13999
B840 PRIME-PLUS WIFI
ASUS
$17500
Chipset
AMD B850AMD B840
Socket
AM5AM5
Form Factor
ATXATX
Max Memory
256 GB192 GB
Memory Type
DDR5DDR5
Memory Slots
44
ECC Memory Support
No No
PCIe x16 Slots
24
PCIe x16 4.0 Slots
24
PCIe x1 Slots
01
M.2 Slots
64
M.2 Slot Specifics
  1. 2280M (PCIe4.0x4)
  2. 2280M (PCIe4.0x4)
  3. 2230-2242M (PCIe4.0x4)
  4. 2280M (PCIe4.0x4)
  5. 2280M (PCIe4.0x4)
  6. 2280E (PCIe4.0x4)
  1. 2280M (PCIe4.0x4)
  2. 2280M (PCIe4.0x4)
  3. 2242-2260M (PCIe4.0x4)
  4. 2280M (PCIe4.0x4)
SATA Ports
40
USB 2.0 Headers
22
USB 3.2 Headers
21
USB 3.2 (Gen 2) Headers
01
WiFi
802.11 ax802.11 ax
Ethernet Speed
2.5 Gbps2.5 Gbps
Audio Chipset
RealtekRealtek
Audio Channels
7.17.1
Optical S/PDIF Out
No No
BIOS Flashback
No No
Color
DarkDark
Supported CPUs
AMD Ryzen 7000, 8000, 9000AMD Ryzen 7000, 8000, 9000
M.2 Heatsink/Shields
Yes-
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Comparison Analysis

Comparing the B850 Pro RS WiFi vs B840 PRIME-PLUS WIFI reveals distinct differences in their targeted use cases.

The B850 Pro RS WiFi is the more budget-friendly option, costing approximately $35 (25%) less than the B840 PRIME-PLUS WIFI.