ASUS PRIME B840M-A WIFI-CSM MOTHERBOARD(3y)- 90MB1J20-M0UAYC

Category	Specification
Model	ASUS PRIME B840M-A WIFI-CSM
CPU Socket	AMD AM5
Chipset	AMD B840
Form Factor	Micro-ATX
Memory Support	4× DDR5 DIMM, Dual Channel, up to 256GB, up to 7600MT/s (OC), EXPO & AEMP support
Expansion Slots	1× PCIe 4.0 x16 (SafeSlot Core+), 2× PCIe 3.0 x16 (x1 mode)
Storage	3× M.2 Slots (2× PCIe 4.0 x4, 1× PCIe 3.0 x4), 4× SATA 6Gb/s Ports
Networking	2.5Gb Ethernet (Realtek), Wi-Fi 6E (2x2), Bluetooth 5.3
USB Ports	Rear: 2× USB 3.2 Gen2 Type-A, 1× USB 3.2 Gen1 Type-C, 4× USB 2.0
Display Outputs	2× DisplayPort, 1× HDMI 2.1 (CPU dependent)
Audio	Realtek 7.1 Surround Sound High Definition Audio
Cooling	VRM & Chipset Heatsinks, Multiple Fan Headers, AIO Pump Header
RGB Support	3× Addressable Gen2 RGB Headers, Aura Sync Compatible
Special Features	BIOS FlashBack, Pre-mounted I/O Shield, Q-Antenna, Q-LED Core
Warranty	3 Year

 

CPU & Chipset

• AMD Socket AM5 supporting Ryzen™ 9000, 8000 & 7000 Series desktop CPUs 

• AMD B840 chipset included 

 Memory

• 4× DDR5 DIMM slots, dual-channel, up to 256 GB

• Supports overclocked speeds of 7600 MT/s+ (with compatible CPUs) 

• ECC & Non‑ECC unbuffered memory; includes On‑Die ECC 

• AMD EXPO™ and ASUS AEMP memory tuning tech included 

 Graphics Outputs

• 2× DisplayPort 1.4 (up to 8K @30 Hz) 

• 1× HDMI 2.1 (up to 4K @60 Hz) 

• Note: actual support depends on installed Ryzen™ CPU 

 Expansion Slots

• With Ryzen 9000/7000: 1× PCIe 4.0 x16 (x16 mode) 

• With Ryzen 8000: PCIe 4.0 x16 runs at x8/x4 mode 

• Plus 2× PCIe 3.0 x16 (operating at x1 mode) via B840 chipset 

 Storage

• 3× M.2 slots:

  • M.2_1 & M.2_2: PCIe 4.0 x4 (with Ryzen 9000/7000) 

  • M.2_2: PCIe 4.0 x4/x2 with Ryzen 8000 

  • M.2_3: PCIe 3.0 x4 via chipset 

• 4× SATA 6 Gb/s ports 

• RAID support via RAIDXpert2:

  • Ryzen 9000: RAID 0/1/5/10

  • Ryzen 8000: RAID 0/1

  • Ryzen 7000: RAID 0/1/10 

 Networking & Wireless

• 2.5 Gb Ethernet (Realtek + LANGuard) 

• Wi‑Fi 6E (802.11ax) dual-band 2×2, + Bluetooth 5.3 

• Note: 6 GHz support depends on regional regulations & Windows 11 onwards 

 USB Connectivity

• Rear: 2× USB 10 Gbps Type‑A, 1× USB 5 Gbps Type‑C, 4× USB 2.0 a

• Internal headers: 1× USB 5 Gbps (Type‑C), 1× USB 5 Gbps header (supports 2 ports), 2× USB 2.0 headers (support 4 ports)