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SpecificationASUS PRIME B850M-A-CSMB850M Challenger AM5 mATX HDMI/DP
Price (new) (differs)£144.98as of 20 Sep, 06:22£142.23as of 20 Sep, 06:22
Amazon Warehouse offernot statednot stated
RRP (differs)£377.99not stated
Price badgenot statednot stated
First available on Amazon (differs)Apr 2025 (1 yr 5 mo old)Feb 2026 (6 mo old)
Brand (differs)ASUSASRock
SocketAM5AM5
ChipsetB850B850
Form factorMicro-ATXMicro-ATX
Memory typeDDR5DDR5
RAM slots (differs)not stated4
Maximum RAMnot statednot stated
Fastest RAM speed stated (differs)not stated8,000 MT/s
M.2 slots (differs)3not stated
Newest PCIe generation statedPCIe 5.0PCIe 5.0
PCIe 5.0 graphics slot (differs)not statedYes
PCIe 5.0 M.2 slot (differs)not statedYes
WiFiNone named in the listing titleNone named in the listing title
Bluetoothnot statednot stated
Wired LAN2.5GbE2.5GbE
USB4 / Thunderboltnot statednot stated
Fastest USB-C port5 Gbps5 Gbps
SATA ports (differs)not stated4
Power phases (as stated by the maker) (differs)not stated8+1+1
BIOS flashback (differs)Yesnot stated
Debug LED / POST codenot statednot stated
ARGB headers (differs)Yesnot stated
Video outputsHDMI, DisplayPortHDMI, DisplayPort
Audio codec (differs)not statedALC897
Colournot statednot stated
Amazon sales rank (differs)#13,264#36,335
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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