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ASUS Prime B840M-A

B840 · AM5 · Micro-ATX
ASUS Prime B840M-A product image

General

ChipsetB840
SocketAM5
Form FactorMicro-ATX
Supported CPU FamiliesRyzen 7000, Ryzen 8000G, Ryzen 9000

Highlights

Memory4× DDR5 · max 256 GB · 7600 MT/s
M.2 Slots3×
GPU Slots3× x16 · PCIe 4.0
Fastest USBUSB 10 Gbps
NetworkLAN 2.5 Gbps
Power Stages8+2+1 phases

Manufacturer Links

BIOS downloads ↗CPU support list ↗Driver downloads ↗Memory QVL ↗
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Memory

Memory TypeDDR5
Max RAM Speed7600 MT/s
Max RAM256 GB
DIMM Slots4
RAM Form FactorDIMM
ECC SupportYes

Expansion and Storage

PCIe Version4.0
PCIe x16 Slots3
PCIe x1 Slots0
PCIe Slot Modes
1× PCIe 4.0 x16
2× PCIe 3.0 x16 · electrical: x1
M.2 Slots
M.2_1: PCIe 4.0 x4
M.2_2: PCIe 4.0 x4
M.2_3: PCIe 3.0 x4 · SATA supported
SATA Ports4
Highest USBUSB 10 Gbps
RAID0/1/10

Power Delivery (VRM)

Phase Layout8+2+1
CPU Phases8
SoC Phases2
Misc Phases1
MOSFET8x

Connectivity and Audio

Audio CodecRealtek
LAN ChipRealtek (2.5Gb/s)
Rear I/O
4× USB 2.0 Type-A
1× USB 5Gbps Type-C
2× USB 10Gbps Type-A
1× HDMI
2× DisplayPort
1× 2.5 Gbps LAN
3× Audio jacks (3.5 mm)
Front Panel Headers
4× USB 2.0
2× USB-A 5Gbps
1× USB-C 5Gbps
HD Audio (front audio)
Case Fan Headers4× 4-pin PWM fan
RGB Header3× ARGB (5V 3-pin)
TPM HeaderYes
BIOS Chip32 MB
Dual BIOSNo
Special Features
Audio+solid capacitors
I/O-shield integrated
White Build-compatible (PCB primarily black)
1x M.2 passive heatsink