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Side-by-side comparison of 2 motherboards
SpecificationASUS PRIME B550M-K WIFIASUS Prime B550M-A AC AMD AM4
Price (new) (differs)£150.13as of 20 Sep, 02:43£156.92as of 20 Sep, 02:41
Amazon Warehouse offernot statednot stated
RRPnot statednot stated
Price badge (differs)Lowest we've recorded90-day low
First available on Amazon (differs)Jun 2026 (3 mo old)Jul 2021 (5 yr 2 mo old)
BrandASUSASUS
SocketAM4AM4
ChipsetB550B550
Form factorMicro-ATXMicro-ATX
Memory typeDDR4DDR4
RAM slotsnot statednot stated
Maximum RAMnot statednot stated
Fastest RAM speed statednot statednot stated
M.2 slots (differs)not stated2
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)WiFi 6Yes (generation not stated)
Bluetoothnot statednot stated
Wired LAN (differs)not stated1GbE
USB4 / Thunderboltnot statednot stated
Fastest USB-C portnot statednot stated
SATA portsnot statednot stated
Power phases (as stated by the maker)not statednot stated
BIOS flashbacknot statednot stated
Debug LED / POST code (differs)Yesnot stated
ARGB headersYesYes
Video outputs (differs)HDMI, DisplayPortHDMI
Audio codecnot statednot stated
Colour (differs)Blacknot stated
Amazon sales rank (differs)#1,413#86,196
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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