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SpecificationASUS PRIME B840M-A CSM AMD B840 mATX motherboardMSI PRO B840-S EVO WIFI6E Motherboard
Price (new) (differs)£134.99as of 20 Sep, 06:21£136.99as of 20 Sep, 06:22
Amazon Warehouse offernot statednot stated
RRP (differs)£173.21£139.99
Price badge (differs)30-day lownot stated
First available on Amazon (differs)Jan 2025 (1 yr 8 mo old)Jan 2026 (8 mo old)
Brand (differs)ASUSMSI
SocketAM5AM5
ChipsetB840B840
Form factor (differs)Micro-ATXATX
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)32
Newest PCIe generation statedPCIe 4.0PCIe 4.0
PCIe 5.0 graphics slotnot statednot stated
PCIe 5.0 M.2 slotnot statednot stated
WiFi (differs)None named in the listing titleWiFi 6E
Bluetooth (differs)not stated5.3
Wired LAN2.5GbE2.5GbE
USB4 / Thunderboltnot statednot stated
Fastest USB-C port (differs)5 Gbps10 Gbps
SATA portsnot statednot stated
Power phases (as stated by the maker)not statednot stated
BIOS flashback (differs)Yesnot stated
Debug LED / POST code (differs)Yesnot stated
ARGB headers (differs)Yesnot stated
Video outputs (differs)HDMI, DisplayPortnot stated
Audio codecnot statednot stated
Colournot statednot stated
Amazon sales rank (differs)#110,665#1,076
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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