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ASUS PRIME B840-PLUS WIFI

ASUSMainstream motherboard

PRIME B840-PLUS WIFI

Released January 2025.8Press articlepcgameshardware.de/Mainboard-Hardware-154107/News/AM5-Mainboards-von-Asus-mit-B850-und-B840-ab-209-Euro-1462968Read 15 October 2026Article of 2025-01-06 on the ASUS CES 2025 announcement: the boards start in retail on 13 January. Early German listings of the PRIME B840-PLUS WIFI at 228 euro were reported on 2025-01-05. Last checked 15 October 2026.

CPU socket
AM5
Chipset
AMD B840
Form factor
ATX
M.2 slots
3

62 of 78 fields known.

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At a glance

Ports

  • USB-C USB 3.2 Gen 2
  • USB-A USB 3.2 Gen 2
  • 2 USB-A USB 3.2 Gen 1
  • 4 USB-A USB 2.0
  • DisplayPort 1.4
  • HDMI 2.1
  • Ethernet (RJ45)
  • 3 3.5 mm audio
  • USB-C header
  • USB 3 header (19-pin)
  • 2 USB 2.0 header (9-pin)

All specs

SourceCalculated

General

Series
PRIME2Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 2026PRIME is the ASUS line in the product name.
Model numbers
PRIME B840-PLUS WIFI, 90MB1IZ0-M0EAY0, 90MB1IZ0-M0AAY01Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The page names the model PRIME B840-PLUS WIFI. The part numbers 90MB1IZ0-M0EAY0 (Scan UK, the Spanish datasheet) and 90MB1IZ0-M0AAY0 (BuildCores) are from retail sources. The -CSM business version is a separate product.9Retailer pagescan.co.uk/products/asus-prime-b840-plus-wifi-amd-b840-am5-ddr5-pcie-40-3x-m2-25gbe-ax-wifi-6e-bt-usb-10gbps-type-apluscRead 15 October 2026Model number 90MB1IZ0-M0EAY0.10Spec databasebuildcores.com/products/Motherboard/ssmzdxbne/Asus-B840-PRIME-PLUS-WIFI-AM5-DDR5-ATXRead 15 October 2026Part numbers PRIME B840-PLUS WIFI, 90MB1IZ0-M0AAY0 and 90MB1IZ0-M0EAY0.
GTIN / EAN
4711387797273, 1971057972779Retailer pagescan.co.uk/products/asus-prime-b840-plus-wifi-amd-b840-am5-ddr5-pcie-40-3x-m2-25gbe-ax-wifi-6e-bt-usb-10gbps-type-apluscRead 15 October 2026GTIN 4711387797273 for model number 90MB1IZ0-M0EAY0.10Spec databasebuildcores.com/products/Motherboard/ssmzdxbne/Asus-B840-PRIME-PLUS-WIFI-AM5-DDR5-ATXRead 15 October 2026UPC 197105797277 and EAN 4711387797273. The UPC is the other board code that the Spanish retailer datasheet for 90MB1IZ0-M0EAY0 prints as 0197105797277. The two codes are not paired with a part number, so no variant rows are written.
Announced
6 January 20258Press articlepcgameshardware.de/Mainboard-Hardware-154107/News/AM5-Mainboards-von-Asus-mit-B850-und-B840-ab-209-Euro-1462968Read 15 October 2026Article date 2025-01-06, source credited to ASUS, ASUS presented the boards at CES 2025.
Status
Available9Retailer pagescan.co.uk/products/asus-prime-b840-plus-wifi-amd-b840-am5-ddr5-pcie-40-3x-m2-25gbe-ax-wifi-6e-bt-usb-10gbps-type-apluscRead 15 October 2026Scan UK product page shows delivery for 2026-10-16, which means the board is on sale on 2026-10-15.
Predecessor
Not available
Successor
Not available
Launch price (US)
Not available
Launch price (EU)
€2398Press articlepcgameshardware.de/Mainboard-Hardware-154107/News/AM5-Mainboards-von-Asus-mit-B850-und-B840-ab-209-Euro-1462968Read 15 October 2026The article lists the ASUS Prime B840-Plus WiFi at 239 euro, with B840 boards at 209 to 239 euro, from the ASUS announcement. The article states no region and no tax treatment, so this is the euro price as the German site printed it. Early retailer listings were 228 euro. The USD launch price is left out because MaxMyBuild ($180), a distributor feed ($199.99) and a Wccftech conversion ($195 excl. VAT) disagree.
Markets
Not available
Colours
Not available
Segment
Mainstream1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026ASUS PRIME is not a gaming, creator or workstation line, so the segment is mainstream.
Board revision
Not available

Platform

CPU socket
AM51Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026
Chipset
AMD B8401Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026
Supported processors
AMD Ryzen 9000 Series, AMD Ryzen 8000 Series, AMD Ryzen 7000 Series1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026AM5 for AMD Ryzen 9000, 8000 and 7000 Series Desktop Processors. The page refers to the ASUS download center for the CPU support list. Read on 2026-10-15.
CPU overclocking
No6Maker product pageamd.com/en/products/processors/chipsets/am5.htmlRead 15 October 2026AMD's AM5 chipset comparison table has the column Ryzen processor overclocking enabled. It reads No for B840 and Yes for DDR5 memory overclocking with AMD EXPO. This is the chip maker's page and not the board maker's. The ASUS pages state no CPU overclocking for this board.

Board

Front and side, drawn to scale.

Form factor
ATX1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026ATX form factor, 12 inch x 9.6 inch (30.5 cm x 24.4 cm).
Board dimensions
Width244Height305mm(9.6 × 12 in)1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026ATX form factor, 12 inch x 9.6 inch (30.5 cm x 24.4 cm).
PCB layers
62Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 2026Six-layer PCB design.
Back-connect design
No1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The manual layout and the maker's photo show the usual front-side power and USB connectors. The board is not a back-connect design.
RGB lighting on the board
No1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The Aura Sync list names only the Addressable Gen 2 headers, and the feature list names no lit part of the board. Q-LED Core is a status light. The maker's board photo shows no lit part.

Power delivery

Power stage layout
8+2+12Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 20268+2+1 phase digital power design with discrete MOSFETs: 8 Vcore, 2 SOC and 1 misc. The page lists no current rating for the stages.
CPU core (Vcore) power stages
82Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 2026The power diagram shows 8 Vcore power stages, 2 SOC and 1 misc.
Vcore power stage rating
Not available
VRM controller
Not available
CPU power connectors
8+4 pin1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Internal connectors: 1 x 8-pin +12V CPU power connector, 1 x 4-pin +12V CPU power connector and the 24-pin main power connector.
Extra slot power connector
No1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The internal connector list has no extra slot power connector.

Memory

Memory type
DDR51Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 20264 x DIMM slots, DDR5, dual channel.
Memory slots
41Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026
Max memory
256GB1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The page says max. 256GB. The December 2024 manual says max. 192GB, and retailers copy 192 GB. The page wins as the newer maker statement.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/PRIME_B840-PLUS_WIFI/E24443_PRIME_B840-PLUS_WIFI_EM_WEB.pdfRead 15 October 2026Specifications summary: max. 192GB. The product page says 256GB and wins.
Max memory speed (overclocked)
7,600MT/s1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Up to 7600+ MT/s (OC) with Ryzen 9000, 8000 and 7000 Series. The Ryzen 9000 value is stored. The page says supported speeds and module counts vary with the CPU and memory configuration. No other CPU or module setup is listed.
ECC memory
Yes1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The page lists ECC and non-ECC unbuffered DIMM, and says non-ECC DDR5 supports On-Die ECC. The maker does not say how ECC works with each CPU. A list of ECC and non-ECC modules with no qualifier counts as true.
CUDIMM support
Not available

Expansion slots

Expansion slots
Physical slotElectrical lanesPCIe generationConnected toCount
PCIe x16164CPU1
PCIe x1643Chipset1
PCIe x1613Chipset2
PCIe x113Chipset1
Source1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Ryzen 9000 and 7000: 1 x PCIe 4.0 x16 slot at x16. Ryzen 8000: the same slot at x8 or x4. Chipset: 1 x PCIe 3.0 x16 slot at x4 (PCIEX16(G3)_2), 2 x PCIe 3.0 x16 slots at x1 (PCIEX16(G3)_1 and _3) and 1 x PCIe 3.0 x1 slot. PCIEX16(G3)_2 runs at x1 when any of the _1, _3 or PCIEX1 slots is occupied.
Full-length PCIe slots
4
Fastest PCIe x16 slot generation
4

Storage

M.2 storage slots
SlotPCIe generationPCIe lanesConnected toLongest driveTakes SATA drivesHeatsink
M.2_144CPUM.2 2280NoYes
M.2_244CPUM.2 2280NoNo
M.2_334ChipsetM.2 2280NoNo
Source1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Ryzen 9000 and 7000: M.2_1 and M.2_2 are Key M, type 2280, PCIe 4.0 x4 from the CPU. Ryzen 8000 runs M.2_2 at PCIe 4.0 x4 or x2. M.2_3 is Key M, type 2242/2260/2280, PCIe 3.0 x4 from the B840 chipset. No slot lists a SATA mode, so sata is false. The heatsink flags come from the overview page and the manual: one flexible M.2 heatsink that fits M.2_1 or M.2_2, shown on M.2_1 in the maker's photo.2Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 2026One Flexible M.2 heatsink can take care of either of the two M.2 slots. The product photo shows it on M.2_1. M.2_2 and M.2_3 have no heatsink.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/PRIME_B840-PLUS_WIFI/E24443_PRIME_B840-PLUS_WIFI_EM_WEB.pdfRead 15 October 2026Specifications summary and section 1.5: the same slot list as the specification page. The flexible M.2 heatsink can be installed on either the M.2_1 or the M.2_2 slot, and the heatsink steps apply only if a heatsink is pre-installed.
M.2 slots
3
PCIe 5.0 M.2 slots
0
SATA ports
41Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Storage: 4 x SATA 6Gb/s ports.

Rear ports

Rear ports
TypeVersionCountMax link rate (Gbps)
USB-CUSB 3.2 Gen 2110
USB-AUSB 3.2 Gen 2110
USB-AUSB 3.2 Gen 125
USB-AUSB 2.040.48
DisplayPortDisplayPort 1.41Not available
HDMIHDMI 2.11Not available
Ethernet (RJ45)Not available12.5
3.5 mm audioNot available3Not available
Source1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Back panel list: 1 USB 10Gbps Type-C, 1 USB 10Gbps Type-A, 2 USB 5Gbps Type-A, 4 USB 2.0 Type-A, 1 DisplayPort (max 8K@30Hz as specified in DisplayPort 1.4), 1 HDMI (4K@60Hz as specified in HDMI 2.1), the Wi-Fi module, 1 Realtek 2.5Gb Ethernet port, 3 audio jacks and the BIOS FlashBack button. ASUS names USB by speed, so 10Gbps is stored as USB 3.2 Gen 2 and 5Gbps as USB 3.2 Gen 1. The page does not say the Type-C port has DisplayPort Alt mode. The footnote USB Type-C power delivery output max. 5V/3A sits under the front USB list and names no port, so it is not stored.
Rear USB ports
8
Rear USB-C ports
1
Fastest rear USB port
10Gbps
Thunderbolt
Not available

Internal connectors

Internal USB headers
HeaderMax data rate (Gbps)HeadersFront ports served
USB-C header511
USB 3 header (19-pin)512
USB 2.0 header (9-pin)0.4824
Source1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 20261 x USB 5Gbps connector (supports USB Type-C), 1 x USB 5Gbps header for 2 ports and 2 x USB 2.0 headers for 4 ports. The 1 x Thunderbolt (USB4) header is for an add-in card and is not counted.
Front USB-C header speed
5Gbps
Fan headers
71Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026CPU fan, CPU OPT fan, AIO pump and 4 chassis fan headers, all 4-pin.
ARGB headers
31Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 20263 x Addressable Gen 2 headers.
RGB headers
01Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The internal connector list has 3 Addressable Gen 2 headers and no 12 V RGB header.

Networking

Ethernet controllers
Realtek RTL81254Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/helpdesk_downloadRead 15 October 2026The ASUS driver download page for this model, read through its public data feed, lists a Realtek RTL8125 LAN driver and a Realtek RTL8125D LAN driver for Windows 11. The suffix D is left out. The specification page says only Realtek 2.5Gb Ethernet.7Spec databasemaxmybuild.com/motherboards/asus-prime-b840-plus-wifiRead 15 October 2026Spec table: LAN chip Realtek RTL8125, which matches the ASUS driver list.
Ethernet ports
1
Ethernet speed
2.5Gbps
Wi-Fi included
Yes1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026A Wi-Fi module is listed on the back panel (1 x Wi-Fi module).
Wi-Fi standard
Wi-Fi 6E1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 20262x2 Wi-Fi 6E (802.11ax).
Wi-Fi bands
2.4 GHz, 5 GHz, 6 GHz1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Supports 2.4/5/6GHz. The 6 GHz band varies by country and needs Windows 11 or later.
Max Wi-Fi channel width
Not available
Wi-Fi module
MediaTek MT79224Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/helpdesk_downloadRead 15 October 2026The same list names a MediaTek MT7922 WiFi driver and a MediaTek MT7922 Bluetooth driver. The specification page says only 2x2 Wi-Fi 6E.
Bluetooth
5.31Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Bluetooth v5.3. The page says the version may vary and refers to the Wi-Fi module maker.

Audio

Audio codec
Realtek ALC8977Spec databasemaxmybuild.com/motherboards/asus-prime-b840-plus-wifiRead 15 October 2026Spec table: audio codec ALC897. ASUS names only a Realtek 7.1 codec, and its driver list names no model. This is the one source for the model. The same site lists MSRP $180 and a VRM of 2x4+2+1, which are not stored.
DAC chip
Not available

Features

BIOS flashback
Yes1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026BIOS FlashBack button on the back panel.
Clear CMOS button (rear)
No1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The back panel list has only the BIOS FlashBack button. Clear CMOS is a header on the board.
POST code display
No1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Special features list ASUS Q-LED Core, a set of colour-coded status lights. No two-digit Q-Code display is listed.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/PRIME_B840-PLUS_WIFI/E24443_PRIME_B840-PLUS_WIFI_EM_WEB.pdfRead 15 October 2026The layout lists no two-digit display. Q-LED Core is a status light.
Power button on the board
No1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The internal connector list and the special features list name no power or start button on the board. The manual layout shows none.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/PRIME_B840-PLUS_WIFI/E24443_PRIME_B840-PLUS_WIFI_EM_WEB.pdfRead 15 October 2026The layout lists no power or start button. The front panel connector has a PWR_BTN header only.
Dual BIOS
No1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026BIOS is a single 256 Mb flash ROM. Dual BIOS is not stated.
Pre-installed I/O shield
Yes1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Special features list: Pre-mounted I/O shield.2Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 2026Pre-Mounted I/O Shield: the pre-installed shield safeguards the ports.
Tool-free features
Push-on antenna connector1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026ASUS Q-Design lists Q-Antenna, which the overview page describes as a snap-in Wi-Fi antenna connector. Q-DIMM and Q-Slot are also listed, but no read ASUS page says what they do, so they are not stored. The M.2 heatsink and the M.2 SSDs use screws.2Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 2026Q-Antenna: the antenna fasteners snap into place instead of being turned.

Measured

We could not find any of these 3 fields. Show them
VRM temperature under CPU load
Not available
Power draw idle
Not available
Power draw CPU stress
Not available

In the box

In the box
2 x SATA 6Gb/s cables, 1 x ASUS WiFi Q-Antenna, 1 x M.2 rubber package, 3 x Screw packages for M.2 SSD, 1 x Quick start guide1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Accessories list on the specification page, the same as the manual's package contents.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/PRIME_B840-PLUS_WIFI/E24443_PRIME_B840-PLUS_WIFI_EM_WEB.pdfRead 15 October 2026Package contents: 2 x SATA 6Gb/s cables, 1 x ASUS WiFi Q-Antenna, 1 x M.2 rubber package, 3 x Screw packages for M.2 SSD, 1 x Quick start guide.

Warranty

Manufacturer warranty (source market)
3years5Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/helpdesk_warrantyRead 15 October 2026ASUS warranty page for the model: motherboard standard warranty 3 years, for the global site.

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Sources

We read 10 sources for this motherboard. The numbers match the markers in the sheet.

  1. Read 15 October 2026Backs 37 fields
  2. Read 15 October 2026Backs 8 fields
  3. Read 15 October 2026Backs 6 fields
  4. Read 15 October 2026Backs 2 fields
  5. Read 15 October 2026Backs 1 field
  6. Read 15 October 2026Backs 1 field
  7. Read 15 October 2026Backs 2 fields
  8. Read 15 October 2026Backs 3 fields
  9. Read 15 October 2026Backs 3 fields
  10. Read 15 October 2026Backs 2 fields

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