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Product comparison · 2 motherboards

ASUS PRIME B840M-R vs ASUS ROG CROSSHAIR X870E EDITION 20

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  • 58specifications compared
  • 29differ
  • 29identical
  • 47known for one product only

Key differences

The ASUS ROG CROSSHAIR X870E EDITION 20 has 2 more memory slots than the ASUS PRIME B840M-R (4 vs 2). The ASUS ROG CROSSHAIR X870E EDITION 20 has 2,000 MHz more supported memory clock speed (max) than the ASUS PRIME B840M-R (9600 MHz vs 7600 MHz). The ASUS ROG CROSSHAIR X870E EDITION 20 has 128 GB more maximum internal memory than the ASUS PRIME B840M-R (256 GB vs 128 GB). Only the ASUS ROG CROSSHAIR X870E EDITION 20 has Wi-Fi. ECC сompatibility: Non-ECC on the ASUS PRIME B840M-R, ECC & Non-ECC on the ASUS ROG CROSSHAIR X870E EDITION 20.

  • Number of memory slots
    • 2
    • 4
  • ECC сompatibility
    • Non-ECC
    • ECC & Non-ECC
  • Supported memory clock speed (max)
    • 7600 MHz
    • 9600 MHz
  • Maximum internal memory
    • 128 GB
    • 256 GB
  • Number of HDDs supported
    • 4
    • 2
  • Number of storage drives supported
    • 6
    • 7
  • USB 2.0 connectors
    • 2
    • 3
  • USB 3.2 Gen 1 (3.1 Gen 1) connectors
    • 1
    • 2

Side by side

Differences highlightedShow differences only
105 specifications
A

ASUS

PRIME B840M-RView product
B

ASUS

ROG CROSSHAIR X870E EDITION 20View product
Processor1 differ
Compatible processor seriesDiffersAMD Ryzen 9000 Series, AMD Ryzen 8000 Series, AMD Ryzen 7000 SeriesAMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series
Supported processor socketsKnown for oneSocket AM5
Memory4 differ
Number of memory slotsDiffers24
ECC сompatibilityDiffersNon-ECCECC & Non-ECC
Supported memory clock speed (max)Differs7600 MHz9600 MHz
Maximum internal memoryDiffers128 GB256 GB
Maximum internal memory per slotKnown for one64 GB
Storage controllers3 differ
Supported storage drive interfacesDiffersM.2, SATA IIIM.2, PCI Express 5.0, PCI Express 4.0, SATA III
Number of HDDs supportedDiffers42
Number of storage drives supportedDiffers67
Graphicsidentical
Maximum resolutionKnown for one3840 x 2160 pixels
Internal I/O4 differ
USB 2.0 connectorsDiffers23
USB 3.2 Gen 1 (3.1 Gen 1) connectorsDiffers12
USB 3.2 Gen 2 (3.1 Gen 2) connectorsDiffers02
Number of SATA III connectorsDiffers42
Number of EPS power connectors (8-pin)Known for one3
Number of water pump connectorsKnown for one2
RGB LED pin headerKnown for oneYes
Number of RGB LED pin headersKnown for one5
S/PDIF out connectorKnown for oneYes
Number of COM connectorsKnown for one1
TPM connectorKnown for oneYes
Rear panel I/O ports5 differ
USB 2.0 ports quantityDiffers20
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantityDiffers48
USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantityDiffers04
USB4 Gen 3x2 ports quantityKnown for one2
Ethernet LAN (RJ-45) portsDiffers12
HDMI ports quantityDiffers10
DisplayPort versionKnown for one1.4a
S/PDIF out portKnown for oneYes
Digital audio optical outKnown for one1
PS/2 ports quantityKnown for one1
DisplayPorts quantityKnown for one1
USB connector typeKnown for oneUSB Type-A
Network3 differ
Ethernet interface typeDiffersGigabit Ethernet10 Gigabit Ethernet
Wi-FiDiffersNoYes
Top Wi-Fi standardDiffersNot availableWi-Fi 7 (802.11be)
Wi-Fi standardsKnown for oneWi-Fi 7 (802.11be)
WLAN controller modelKnown for oneMediaTek MT7927
BluetoothKnown for oneYes
Bluetooth versionKnown for one5.4
Features4 differ
Motherboard form factorDiffersmicro ATXATX
Motherboard chipsetDiffersAMD B840AMD X870E
Audio chipKnown for oneRealtek ALC4082
Product colourDiffersMulticolourBlack
Cooling typeKnown for oneliquid
Power source typeKnown for oneATX
Windows operating systems supportedDiffersWindows 11, Windows 10 x64Windows 11
Expansion slots2 differ
PCI Express x16 (Gen 5.x) slotsKnown for one2
Number of M.2 (M) slotsDiffers25
1st M.2 largest key sizeDiffers228022110
1st M.2 highest PCI Express generationKnown for one5.0
2nd M.2 largest key sizeKnown for one2280
2nd M.2 highest PCI Express generationKnown for one5.0
3rd M.2 largest key sizeKnown for one2280
3rd M.2 highest PCI Express generationKnown for one4.0
4th M.2 largest key sizeKnown for one2280
4th M.2 highest PCI Express generationKnown for one4.0
5th M.2 largest key sizeKnown for one2280
5th M.2 highest PCI Express generationKnown for one4.0
PCI Express x1 (Gen 3.x) slotsKnown for one1
PCI Express x16 (Gen 4.x) slotsKnown for one1
BIOS1 differ
BIOS memory sizeDiffers256 Mbit512 Mbit
Clear CMOS buttonKnown for oneYes
BIOS flashback buttonKnown for oneYes
Weight & dimensions2 differ
WidthDiffers236 mm305 mm
DepthDiffers229 mm277 mm
HeightKnown for one36.5 mm
Packaging contentidentical
Antenna includedKnown for oneYes
Cables includedKnown for oneSATA
Screws includedKnown for oneYes
Packaging dataidentical
Package widthKnown for one260 mm
Package depthKnown for one270 mm
Package heightKnown for one51.5 mm
Package weightKnown for one924 g
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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