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Product comparison · 2 motherboards

ASUS PRIME B550M-K WIFI vs ASUS PRIME B840M-R

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  • 60specifications compared
  • 13differ
  • 47identical
  • 16known for one product only

Key differences

The ASUS PRIME B840M-R has 64 GB more maximum internal memory than the ASUS PRIME B550M-K WIFI (128 GB vs 64 GB). The ASUS PRIME B840M-R has 128 Mbit more BIOS memory size than the ASUS PRIME B550M-K WIFI (256 Mbit vs 128 Mbit). The ASUS PRIME B550M-K WIFI has 8 mm more width than the ASUS PRIME B840M-R (244 mm vs 236 mm). Only the ASUS PRIME B550M-K WIFI has Wi-Fi. Processor socket: Socket AM4 on the ASUS PRIME B550M-K WIFI, Socket AM5 on the ASUS PRIME B840M-R.

  • Processor socket
    • Socket AM4
    • Socket AM5
  • Supported memory types
    • DDR4-SDRAM
    • DDR5-SDRAM
  • ECC сompatibility
    • ECC
    • Non-ECC
  • Maximum internal memory
    • 64 GB
    • 128 GB
  • RAID levels
    • 0, 1, 10
    • 0, 1, 5, 10
  • Wi-Fi
    • Yes
    • No
  • Top Wi-Fi standard
    • Wi-Fi 6 (802.11ax)
    • Not available
  • Motherboard chipset
    • AMD B550
    • AMD B840

Side by side

Differences highlightedShow differences only
76 specifications
A

ASUS

PRIME B550M-K WIFIView product
B

ASUS

PRIME B840M-RView product
Processor2 differ
Processor manufacturerAMDAMD
Processor socketDiffersSocket AM4Socket AM5
Compatible processor seriesDiffersAMD Ryzen 5000 Series, AMD Ryzen 4000 Series, AMD Ryzen 3000 SeriesAMD Ryzen 9000 Series, AMD Ryzen 8000 Series, AMD Ryzen 7000 Series
Memory3 differ
Supported memory typesDiffersDDR4-SDRAMDDR5-SDRAM
Number of memory slots22
Memory slots typeDIMMDIMM
Memory channelsDual-channelDual-channel
ECC сompatibilityDiffersECCNon-ECC
Supported memory clock speed (max)Known for one7600 MHz
Maximum internal memoryDiffers64 GB128 GB
Unbuffered memoryYesYes
Supported memory clock speedsKnown for one5100,4866,4600,4466,4400,4333,4266,4200,4133,4000,3866,3733,3600,3466,3400,3333,3200,3000,2933,2800,2666,2400,2133 MHz
Storage controllers1 differ
Supported storage drive typesHDD & SSDHDD & SSD
Supported storage drive interfacesM.2, SATA IIIM.2, SATA III
Number of HDDs supported44
Number of storage drives supported66
RAID supportYesYes
RAID levelsDiffers0, 1, 100, 1, 5, 10
Graphicsidentical
Parallel processing technology supportKnown for oneNot supported
Internal I/Oidentical
USB 2.0 connectors22
USB 3.2 Gen 1 (3.1 Gen 1) connectors11
USB 3.2 Gen 2 (3.1 Gen 2) connectors00
Number of SATA III connectors44
S/PDIF out connectorKnown for oneYes
Front panel audio connectorYesYes
ATX Power connector (24-pin)YesYes
CPU fan connectorYesYes
Number of CPU fan connectors11
Number of chassis fan connectors22
EPS power connector (8-pin)YesYes
12V power connectorYesYes
Number of COM connectors11
TPM connectorYesYes
Number of EPS power connectors (8-pin)Known for one1
Rear panel I/O portsidentical
USB 2.0 ports quantity22
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity44
USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity00
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity00
USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity00
Ethernet LAN (RJ-45) ports11
PS/2 ports quantity11
VGA (D-Sub) ports quantity00
HDMI ports quantity11
DVI-D ports quantity00
DisplayPorts quantity11
Headphone outputs11
Line-inKnown for oneYes
Microphone inYesYes
USB connector typeKnown for oneUSB Type-A
Network2 differ
Ethernet LANYesYes
Ethernet interface typeGigabit EthernetGigabit Ethernet
Wi-FiDiffersYesNo
Top Wi-Fi standardDiffersWi-Fi 6 (802.11ax)Not available
BluetoothKnown for oneYes
Features2 differ
Component forPCPC
Motherboard form factormicro ATXmicro ATX
Motherboard chipset familyAMDAMD
Motherboard chipsetDiffersAMD B550AMD B840
Audio output channels7.1 channels7.1 channels
Product colourMulticolourMulticolour
Windows operating systems supportedDiffersWindows 10 x64, Windows 11Windows 11, Windows 10 x64
Expansion slotsidentical
PCI Express x1 (Gen 3.x) slots11
PCI Express x16 (Gen 4.x) slotsKnown for one1
Number of M.2 (M) slots22
1st M.2 largest key size22802280
2nd M.2 largest key sizeKnown for one22110
BIOS1 differ
BIOS typeUEFI AMIUEFI AMI
BIOS memory sizeDiffers128 Mbit256 Mbit
Packaging dataidentical
Package widthKnown for one260 mm
Package depthKnown for one270 mm
Package heightKnown for one51.5 mm
Package weightKnown for one924 g
Weight & dimensions2 differ
WidthDiffers244 mm236 mm
DepthDiffers221 mm229 mm
HeightKnown for one36.5 mm
Other featuresidentical
WeightKnown for one563 g

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.

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