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Product comparison · 2 motherboards

ASUS PRIME B840M-K vs ASUS ROG CROSSHAIR X870E DARK HERO

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  • 61specifications compared
  • 25differ
  • 36identical
  • 32known for one product only

Key differences

The ASUS ROG CROSSHAIR X870E DARK HERO has 2 more memory slots than the ASUS PRIME B840M-K (4 vs 2). The ASUS ROG CROSSHAIR X870E DARK HERO has 128 GB more maximum internal memory than the ASUS PRIME B840M-K (256 GB vs 128 GB). The ASUS ROG CROSSHAIR X870E DARK HERO has 3 more storage drives supported than the ASUS PRIME B840M-K (9 vs 6). Only the ASUS ROG CROSSHAIR X870E DARK HERO has Wi-Fi. Ethernet interface type: 2.5 Gigabit Ethernet on the ASUS PRIME B840M-K, 5 Gigabit Ethernet, 10 Gigabit Ethernet on the ASUS ROG CROSSHAIR X870E DARK HERO.

  • Number of memory slots
    • 2
    • 4
  • Maximum internal memory
    • 128 GB
    • 256 GB
  • Number of storage drives supported
    • 6
    • 9
  • USB 2.0 connectors
    • 2
    • 3
  • Number of chassis fan connectors
    • 3
    • 4
  • USB 2.0 ports quantity
    • 2
    • 0
  • USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity
    • 4
    • 0
  • USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity
    • 0
    • 6

Side by side

Differences highlightedShow differences only
93 specifications
A

ASUS

PRIME B840M-KView product
B

ASUS

ROG CROSSHAIR X870E DARK HEROView product
Memory2 differ
Number of memory slotsDiffers24
Maximum internal memoryDiffers128 GB256 GB
Storage controllers1 differ
Number of storage drives supportedDiffers69
Graphicsidentical
On-board graphics cardKnown for oneNo
Internal I/O2 differ
USB 2.0 connectorsDiffers23
USB 3.2 Gen 2x2 connectorsKnown for one2
Number of SATA II connectorsKnown for one0
Number of SATA connectorsKnown for one0
Number of chassis fan connectorsDiffers34
Number of temperature sensor headersKnown for one1
S/PDIF out connectorKnown for oneYes
Number of COM connectorsKnown for one1
TPM connectorKnown for oneYes
RGB LED pin headerKnown for oneYes
Number of RGB LED pin headersKnown for one3
Rear panel I/O ports5 differ
USB 2.0 ports quantityDiffers20
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantityDiffers40
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantityDiffers06
USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantityDiffers03
USB4 Gen 3x2 ports quantityKnown for one2
Ethernet LAN (RJ-45) portsDiffers12
Microphone inKnown for oneYes
S/PDIF out portKnown for oneYes
WiFi-AP antenna jackKnown for one1
Network3 differ
Ethernet interface typeDiffers2.5 Gigabit Ethernet5 Gigabit Ethernet, 10 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
Features3 differ
Motherboard form factorDiffersmicro ATXATX
Motherboard chipsetDiffersAMD B840AMD X870E
Audio chipKnown for oneRealtek ALC4082
Windows operating systems supportedDiffersWindows 10 x64, Windows 11Windows 11
Expansion slots2 differ
PCI Express x16 (Gen 4.x) slotsDiffers12
PCI Express x16 (Gen 5.x) slotsKnown for one2
Number of M.2 (M) slotsDiffers25
1st M.2 largest key sizeKnown for one22110
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 highest PCI Express generationKnown for one4.0
PCI Express x16 (Gen 3.x) slotsKnown for one1
BIOS1 differ
BIOS memory sizeDiffers256 Mbit512 Mbit
Packaging data4 differ
Package widthDiffers270 mm308 mm
Package depthDiffers263 mm367 mm
Package heightDiffers51.5 mm110 mm
Package weightDiffers1.02 kg4.43 kg
Weight & dimensions2 differ
WidthDiffers244 mm305 mm
DepthDiffers221 mm244 mm
Packaging contentidentical
Antenna includedKnown for oneYes
Other featuresidentical
mSATA ports quantityKnown for one0

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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