Product comparison · 2 motherboards

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

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
- PRIME B550M-K WIFI:Socket AM4
- PRIME B840M-R:Socket AM5
Supported memory types
- PRIME B550M-K WIFI:DDR4-SDRAM
- PRIME B840M-R:DDR5-SDRAM
ECC сompatibility
- PRIME B550M-K WIFI:ECC
- PRIME B840M-R:Non-ECC
Maximum internal memory
- PRIME B550M-K WIFI:64 GB
- PRIME B840M-R:128 GB
RAID levels
- PRIME B550M-K WIFI:0, 1, 10
- PRIME B840M-R:0, 1, 5, 10
Wi-Fi
- PRIME B550M-K WIFI:Yes
- PRIME B840M-R:No
Top Wi-Fi standard
- PRIME B550M-K WIFI:Wi-Fi 6 (802.11ax)
- PRIME B840M-R:Not available
Motherboard chipset
- PRIME B550M-K WIFI:AMD B550
- PRIME B840M-R:AMD B840

Side by side

Differences highlightedShow differences only

Comparison of PRIME B550M-K WIFI, PRIME B840M-R
76 specifications	A ASUS PRIME B550M-K WIFI View product	B ASUS PRIME B840M-R View product
Processor2 differ
Processor socketDiffers	Socket AM4	Socket AM5
Compatible processor seriesDiffers	AMD Ryzen 5000 Series, AMD Ryzen 4000 Series, AMD Ryzen 3000 Series	AMD Ryzen 9000 Series, AMD Ryzen 8000 Series, AMD Ryzen 7000 Series
Memory3 differ
Supported memory typesDiffers	DDR4-SDRAM	DDR5-SDRAM
ECC сompatibilityDiffers	ECC	Non-ECC
Supported memory clock speed (max)Known for one	Unknown — not stated by the source	7600 MHz
Maximum internal memoryDiffers	64 GB	128 GB
Supported memory clock speedsKnown for one	5100,4866,4600,4466,4400,4333,4266,4200,4133,4000,3866,3733,3600,3466,3400,3333,3200,3000,2933,2800,2666,2400,2133 MHz	Unknown — not stated by the source
Storage controllers1 differ
RAID levelsDiffers	0, 1, 10	0, 1, 5, 10
Graphicsidentical
Parallel processing technology supportKnown for one	Unknown — not stated by the source	Not supported
Internal I/Oidentical
S/PDIF out connectorKnown for one	Unknown — not stated by the source	Yes
Number of EPS power connectors (8-pin)Known for one	1	Unknown — not stated by the source
Rear panel I/O portsidentical
Line-inKnown for one	Unknown — not stated by the source	Yes
USB connector typeKnown for one	Unknown — not stated by the source	USB Type-A
Network2 differ
Wi-FiDiffers	Yes	No
Top Wi-Fi standardDiffers	Wi-Fi 6 (802.11ax)	Not available
BluetoothKnown for one	Yes	Unknown — not stated by the source
Features2 differ
Motherboard chipsetDiffers	AMD B550	AMD B840
Windows operating systems supportedDiffers	Windows 10 x64, Windows 11	Windows 11, Windows 10 x64
Expansion slotsidentical
PCI Express x16 (Gen 4.x) slotsKnown for one	Unknown — not stated by the source	1
2nd M.2 largest key sizeKnown for one	22110	Unknown — not stated by the source
BIOS1 differ
BIOS memory sizeDiffers	128 Mbit	256 Mbit
Packaging dataidentical
Package widthKnown for one	Unknown — not stated by the source	260 mm
Package depthKnown for one	Unknown — not stated by the source	270 mm
Package heightKnown for one	Unknown — not stated by the source	51.5 mm
Package weightKnown for one	Unknown — not stated by the source	924 g
Weight & dimensions2 differ
WidthDiffers	244 mm	236 mm
DepthDiffers	221 mm	229 mm
HeightKnown for one	Unknown — not stated by the source	36.5 mm
Other featuresidentical
WeightKnown for one	Unknown — not stated by the source	563 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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