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ASUS PRIME B840-PLUS WIFI ATX AM5 motherboard with DDR5, three M.2 slots, CPU-dependent PCIe 4.0 graphics, Wi-Fi 6E, 2.5Gb Ethernet and BIOS FlashBack.
R3,749.00
In Stock with Supplier 2 — 10 avail
Clear fulfilment, warranty and payment details.
ASUS • PRIME B840-PLUS WIFI
The PRIME B840-PLUS WIFI combines an ATX layout with DDR5, three M.2 slots and both wireless and wired networking. Its rear USB-C connection, flexible M.2 heatsink and BIOS FlashBack button add practical detail. Plan the expansion slots around the chosen Ryzen processor and shared chipset lanes to make the most of the available connections.
AM5 foundation
The AM5 socket supports listed Ryzen 9000, 8000 and 7000 desktop processors, with ASUS specifying support up to 170W CPUs. Check the processor’s minimum BIOS against the exact board support list. The rear BIOS FlashBack button provides a supported firmware-update route; follow the manual and exact-model file instructions before use.
DDR5 memory
Four slots provide dual-channel DDR5 with EXPO and AEMP options. The current manufacturer specification lists up to 256GB total and 7600+MT/s with overclocking. Neither figure guarantees every CPU, DIMM kit or four-module population. Start a two-module kit in A2/B2 and check the exact CPU, BIOS and qualified memory entry before choosing higher-capacity modules.
Expansion planning
The main graphics slot runs PCIe 4.0 x16 with listed Ryzen 9000/7000 processors, while Ryzen 8000 configurations use x8 or x4 according to the CPU. The three chipset x16-length slots are electrically one x4 and two x1, plus a separate x1 slot. The chipset x4 slot drops to x1 when any of the other shared chipset slots is occupied, so plan capture, network and storage cards together.
Storage layout
M.2_1 accepts a 2280 PCIe 4.0 x4 SSD. M.2_2 also accepts 2280 drives, operating at PCIe 4.0 x4 with Ryzen 9000/7000 and x4 or x2 with Ryzen 8000 depending on the processor. M.2_3 accepts 2242 / 2260 / 2280 PCIe 3.0 x4 drives from the chipset. Four SATA ports support additional drives, and the flexible M.2 heatsink can be positioned over a supported primary M.2 slot.
Connected setup
Realtek 2.5Gb Ethernet complements 2×2 Wi-Fi 6E and Bluetooth 5.3. The 6GHz band requires an appropriate router, regional permission and Windows 11 or later. Rear USB includes 10Gbps Type-C and Type-A, two 5Gbps Type-A and four USB 2.0 ports. Internal headers add front USB-C, two 5Gbps ports and four USB 2.0 ports when the case provides the matching connections.
Build and control
The 8+2+1 phase power design, VRM heatsinks and flexible M.2 cooling support a considered build. CPU, CPU OPT and AIO pump headers join four chassis-fan headers. Q-Antenna, Q-DIMM, Q-Slot and the pre-mounted I/O shield help during assembly, while Q-LED Core provides diagnostic signalling. Three addressable lighting headers work with compatible Aura Sync hardware.
| Model / socket / chipset | PRIME B840-PLUS WIFI / AM5 / AMD B840 |
|---|---|
| CPU support | Ryzen 9000 / 8000 / 7000 desktop processors; up to 170W CPU as listed; exact CPU and minimum BIOS check required |
| Memory slots / channels | 4 × DDR5 DIMM; dual channel |
| Maximum total memory | 256GB current manufacturer listing; qualified CPU, BIOS and module population conditions apply |
| Per-module / preferred population | Select qualified module capacity and population from ASUS QVL for the exact CPU and BIOS; preferred two-module positions A2 / B2 |
| Memory type / rate | ECC and non-ECC unbuffered DIMM listed; up to 7600+MT/s (OC); CPU and kit dependent |
| Memory profiles | AMD EXPO; ASUS Enhanced Memory Profile (AEMP) |
| CPU graphics slot | PCIe 4.0 x16 with Ryzen 9000 / 7000; PCIe 4.0 x8 or x4 with Ryzen 8000, CPU dependent |
|---|---|
| Chipset expansion | 3 × PCIe 3.0 x16-length slots: 1 × x4 plus 2 × x1; 1 separate PCIe 3.0 x1 |
| Shared lanes | PCIEX16(G3)_1/3 and PCIEX1(G3) share bandwidth with PCIEX16(G3)_2 |
| Sharing consequence | PCIEX16(G3)_2 runs at x1 when any of those other shared slots is occupied |
| Adapter planning | Check CPU-specific bifurcation and ASUS supported peripheral list before multi-device adapter use |
| M.2_1 | Key M, 2280; PCIe 4.0 x4 from CPU |
|---|---|
| M.2_2 | Key M, 2280; PCIe 4.0 x4 with Ryzen 9000 / 7000; PCIe 4.0 x4 / x2 with Ryzen 8000, CPU dependent |
| M.2_3 | Key M, 2242 / 2260 / 2280; PCIe 3.0 x4 from B840 |
| SATA | 4 × SATA 6Gb/s |
| RAID | AMD RAIDXpert2: Ryzen 9000 RAID 0/1/5/10; Ryzen 8000 RAID 0/1; Ryzen 7000 RAID 0/1/10 |
| Drive cooling | Flexible M.2 heatsink for M.2_1 or M.2_2; no assumption every M.2 slot is heatsink covered |
| Ethernet | Realtek 2.5Gb Ethernet; ASUS LANGuard |
|---|---|
| Wi-Fi | 2×2 Wi-Fi 6E (802.11ax), 2.4/5/6GHz; 6GHz requires Windows 11+ and local regulatory support |
| Bluetooth | 5.3 listed; module and software dependent |
| Display | DisplayPort 1.4 up to 8K30; HDMI 2.1 up to 4K60, CPU graphics dependent |
| Rear USB | 1 × 10Gbps Type-C; 1 × 10Gbps Type-A; 2 × 5Gbps Type-A; 4 × USB 2.0 Type-A |
| Other rear connections | Wi-Fi module; Ethernet; 3 audio jacks; BIOS FlashBack button |
| Audio | Realtek 7.1 HD; up to 24-bit/192kHz; case front HD-audio module required for 7.1 output |
| Front USB support | 1 × 5Gbps Type-C connector; 1 × 5Gbps header for 2 ports; 2 × USB 2.0 headers for 4 ports |
|---|---|
| USB-C power | Manufacturer lists maximum 5V/3A output |
| Fan / pump headers | 1 CPU fan; 1 CPU OPT; 1 AIO pump; 4 chassis fan, all 4-pin |
| Power connectors | 24-pin main; 8-pin + 4-pin CPU +12V |
| Lighting | 3 × Addressable Gen 2 headers; Aura Sync |
| Other headers | Clear CMOS; chassis intrusion; COM; F_AUDIO; S/PDIF out; 14-1 pin SPI TPM; 10-1 pin system panel; Thunderbolt (USB4) header |
| Thunderbolt qualification | Internal header requires compatible add-in implementation; not an integrated rear USB4 port |
| Power design | 8+2+1 phase digital design with discrete MOSFETs; VRM heatsinks |
| Firmware / management | 256Mb Flash ROM; UEFI AMI; BIOS FlashBack; EZ Flash 3; CrashFree BIOS 3; WOL by PME; PXE |
| Form factor / dimensions | ATX; 30.5 × 24.4cm |
| OS | Windows 11 / Windows 10 64-bit listed; 6GHz Wi-Fi requires Windows 11+ |
| Package | 2 SATA cables; ASUS WiFi Q-Antenna; 1 M.2 rubber package; 3 M.2 SSD screw packages; quick start guide |
| Software options | Armoury Crate / Aura Sync / Fan Xpert 2+; DriverHub; GlideX; TurboV Core; ASUS CPU-Z; availability and OS conditions apply |
| Supplier-listed warranty / colour | 36 months, applicable local terms require confirmation / black |
Check the exact CPU support entry, required BIOS and qualified memory population before ordering components. Memory OC and wireless capabilities depend on the complete configuration. Supplier lists 36 months warranty; confirm the applicable local terms and proof-of-purchase requirements.
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