Product comparison · 2 motherboards

ASUS PRIME A520M-K ARGB vs ASUS PRIME B840M-R

65specifications compared
16differ
49identical
15known for one product only

Key differences

The ASUS PRIME B840M-R has 64 GB more maximum internal memory than the ASUS PRIME A520M-K ARGB (128 GB vs 64 GB). The ASUS PRIME B840M-R has 1 more storage drives supported than the ASUS PRIME A520M-K ARGB (6 vs 5). The ASUS PRIME A520M-K ARGB has 1 more USB 3.2 Gen 1 (3.1 Gen 1) connectors than the ASUS PRIME B840M-R (2 vs 1). Processor socket: Socket AM4 on the ASUS PRIME A520M-K ARGB, Socket AM5 on the ASUS PRIME B840M-R. Supported memory types: DDR4-SDRAM on the ASUS PRIME A520M-K ARGB, DDR5-SDRAM on the ASUS PRIME B840M-R.

Processor socket
- PRIME A520M-K ARGB:Socket AM4
- PRIME B840M-R:Socket AM5
Supported memory types
- PRIME A520M-K ARGB:DDR4-SDRAM
- PRIME B840M-R:DDR5-SDRAM
ECC сompatibility
- PRIME A520M-K ARGB:ECC
- PRIME B840M-R:Non-ECC
Maximum internal memory
- PRIME A520M-K ARGB:64 GB
- PRIME B840M-R:128 GB
Number of storage drives supported
- PRIME A520M-K ARGB:5
- PRIME B840M-R:6
RAID levels
- PRIME A520M-K ARGB:0, 1, 10
- PRIME B840M-R:0, 1, 5, 10
USB 3.2 Gen 1 (3.1 Gen 1) connectors
- PRIME A520M-K ARGB:2
- PRIME B840M-R:1
Motherboard chipset
- PRIME A520M-K ARGB:AMD A520
- PRIME B840M-R:AMD B840

Side by side

Differences highlightedShow differences only

Comparison of PRIME A520M-K ARGB, PRIME B840M-R
80 specifications	A ASUS PRIME A520M-K ARGB View product	B ASUS PRIME B840M-R View product
Processor2 differ
Processor manufacturer	AMD	AMD
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
Supported processor socketsKnown for one	Socket AM4	Unknown — not stated by the source
Memory3 differ
Supported memory typesDiffers	DDR4-SDRAM	DDR5-SDRAM
Number of memory slots	2	2
Memory slots type	DIMM	DIMM
Memory channels	Dual-channel	Dual-channel
ECC сompatibilityDiffers	ECC	Non-ECC
Maximum internal memoryDiffers	64 GB	128 GB
Unbuffered memory	Yes	Yes
Supported memory clock speed (max)Known for one	Unknown — not stated by the source	7600 MHz
Storage controllers2 differ
Supported storage drive types	HDD & SSD	HDD & SSD
Supported storage drive interfaces	M.2, SATA III	M.2, SATA III
Number of HDDs supported	4	4
Number of storage drives supportedDiffers	5	6
RAID support	Yes	Yes
RAID levelsDiffers	0, 1, 10	0, 1, 5, 10
Graphicsidentical
Parallel processing technology support	Not supported	Not supported
Internal I/O1 differ
USB 2.0 connectors	2	2
USB 3.2 Gen 1 (3.1 Gen 1) connectorsDiffers	2	1
USB 3.2 Gen 2 (3.1 Gen 2) connectors	0	0
Number of SATA III connectors	4	4
S/PDIF out connector	Yes	Yes
Front panel audio connector	Yes	Yes
Front panel connectorKnown for one	Yes	Unknown — not stated by the source
ATX Power connector (24-pin)	Yes	Yes
CPU fan connector	Yes	Yes
Number of CPU fan connectors	1	1
Number of chassis fan connectors	2	2
EPS power connector (8-pin)	Yes	Yes
12V power connector	Yes	Yes
Number of COM connectors	1	1
TPM connector	Yes	Yes
RGB LED pin headerKnown for one	Yes	Unknown — not stated by the source
Number of RGB LED pin headersKnown for one	3	Unknown — not stated by the source
Rear panel I/O portsidentical
USB 2.0 ports quantity	2	2
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity	4	4
USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity	0	0
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity	0	0
USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity	0	0
Ethernet LAN (RJ-45) ports	1	1
PS/2 ports quantity	1	1
VGA (D-Sub) ports quantity	0	0
HDMI ports quantity	1	1
DVI-D ports quantity	0	0
DisplayPorts quantity	1	1
Microphone in	Yes	Yes
Headphone outputsKnown for one	Unknown — not stated by the source	1
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
Networkidentical
Ethernet LAN	Yes	Yes
Ethernet interface type	Gigabit Ethernet	Gigabit Ethernet
Wi-Fi	No	No
Top Wi-Fi standard	Not available	Not available
Features3 differ
Component for	PC	PC
Motherboard form factor	micro ATX	micro ATX
Motherboard chipset family	AMD	AMD
Motherboard chipsetDiffers	AMD A520	AMD B840
Audio output channels	7.1 channels	7.1 channels
Product colourDiffers	Black, White	Multicolour
Windows operating systems supportedDiffers	Windows 10 x64, Windows 11	Windows 11, Windows 10 x64
Expansion slots1 differ
PCI Express x1 (Gen 3.x) slots	1	1
PCI Express x16 (Gen 3.x) slotsKnown for one	1	Unknown — not stated by the source
Number of M.2 (M) slotsDiffers	1	2
1st M.2 largest key size	2280	2280
1st M.2 highest PCI Express generationKnown for one	3.0	Unknown — not stated by the source
PCI Express x16 (Gen 4.x) slotsKnown for one	Unknown — not stated by the source	1
BIOS1 differ
BIOS type	UEFI AMI	UEFI AMI
BIOS memory sizeDiffers	128 Mbit	256 Mbit
Packaging data1 differ
Package width	260 mm	260 mm
Package depth	270 mm	270 mm
Package height	51.5 mm	51.5 mm
Package weightDiffers	804 g	924 g
Weight & dimensions2 differ
WidthDiffers	226 mm	236 mm
DepthDiffers	226 mm	229 mm
HeightKnown for one	Unknown — not stated by the source	36.5 mm
Packaging contentidentical
Cables includedKnown for one	SATA	Unknown — not stated by the source
Screws includedKnown for one	Yes	Unknown — not stated by the source
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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