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SpecificationASRock B850M Challenger WiFi White Socket AM5 Micro-ATX MotherboardMSI PRO B850M-P WIFI Motherboard
Price (new) (differs)£134.49as of 20 Sep, 06:22£137.99as of 20 Sep, 06:22
Amazon Warehouse offernot statednot stated
RRP (differs)£255.99£139.99
Price badgenot statednot stated
First available on Amazon (differs)Jan 2026 (8 mo old)Jun 2025 (1 yr 2 mo old)
Brand (differs)ASRockMSI
SocketAM5AM5
ChipsetB850B850
Form factorMicro-ATXMicro-ATX
Memory typeDDR5DDR5
RAM slots44
Maximum RAMnot statednot stated
Fastest RAM speed stated (differs)8,000 MT/s8,200 MT/s
M.2 slots (differs)not stated3
Newest PCIe generation statedPCIe 5.0PCIe 5.0
PCIe 5.0 graphics slotYesYes
PCIe 5.0 M.2 slotYesYes
WiFiWiFi 7WiFi 7
Bluetooth5.45.4
Wired LAN (differs)2.5GbE5GbE
USB4 / Thunderboltnot statednot stated
Fastest USB-C port (differs)not stated10 Gbps
SATA portsnot statednot stated
Power phases (as stated by the maker) (differs)8+1+1not stated
BIOS flashbacknot statednot stated
Debug LED / POST codenot statednot stated
ARGB headersnot statednot stated
Video outputsnot statednot stated
Audio codec (differs)ALC897not stated
Colour (differs)Whitenot stated
Amazon sales rank (differs)#36,335#1,062
BuyCheck price on AmazonCheck price on Amazon

Highlighted rows differ between these boards. “Not stated” means the Amazon listing does not mention it: the board may still have it, so check the maker’s specification. Power phases are printed as stated by the maker and are not comparable between brands. Prices are the new price on Amazon.co.uk at the time shown; the price on Amazon when you buy is the one that applies.

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