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ASUS PRIME B840-PLUS WIFI vs ASUS ROG STRIX X870-A GAMING WIFI

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Product A: ASUS

PRIME B840-PLUS WIFI

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B

Product B: ASUS

ROG STRIX X870-A GAMING WIFI

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Only differences

AASUS PRIME B840-PLUS WIFI

BASUS ROG STRIX X870-A GAMING WIFI

General

5 of 9 differ

Series

PRIME2Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 2026PRIME is the ASUS line in the product name.

ROG Strix2Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifiRead 16 October 2026ROG Strix is the ASUS line in the product name.

Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

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.

ROG STRIX X870-A GAMING WIFI, 90MB1IF0-M0EAY0, 90MB1IF0-M0AAY01Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026The page names the model ROG STRIX X870-A GAMING WIFI. Part number 90MB1IF0-M0EAY0 is on Arvutitark, Paradigit and Geeknetic. The ASUS US eShop lists 90MB1IF0-M0AAY0.7Retailer pageeshop.asus.com/us/90mb1if0-m0aay0-rog-strix-x870-a-gaming-wifi.htmlRead 16 October 2026The ASUS US eShop lists part number 90MB1IF0-M0AAY0 for the US market.

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.

47113877378598Spec databasegeeknetic.es/comparador-precios/asus-rog-strix-x870-a-gaming-wifi/comprarRead 16 October 2026Identifiers: EAN 4711387737859 and MPN 90MB1IF0-M0EAY0.

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

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.

Not available

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.

Available11Retailer pagemaxmybuild.com/motherboards/asus-rog-strix-x870-a-gaming-wifiRead 16 October 2026Lists the board in stock at several retailers on 2026-10-15.

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

Not available

Not available

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Not available

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

Not available

$369.995Press articleguru3d.com/story/x870e-and-x870-chipset-motherboards-pricing-overviewRead 16 October 2026Guru3D, 2024-10-01, X870E and X870 pricing overview: ASUS ROG STRIX X870-A Gaming WIFI $369.99. US MSRPs exclude sales tax. The article cites VideoCardz, TechPowerUp and Wccftech.10Reviewthefpsreview.com/2024/09/29/asus-rog-strix-x870-a-gaming-wifi-motherboard-reviewRead 16 October 2026The review says the board is priced at $369.99 MSRP. This agrees with Guru3D.

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

€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.

Not available

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

Not available

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ColoursiThe maker's own colour names

Not available

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SegmentiThe maker's own product category, e.g. ASUS ProArt is Creator. It is not assigned from price or features. Maker lines that are not gaming, creator or workstation lines, such as ASUS PRIME, MSI PRO and ASRock Pro, are mainstream.

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.

Gaming1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026The page sits in the ROG Strix family of the Republic of Gamers gaming boards.

Board revisioniThe maker's revision name, e.g. rev. 1.1, for variant rows of revisions that keep the board's name and model number. Leave it out when the maker names no revision.

Not available

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Platform

2 of 4 differ

CPU socketiSocket name without spaces, e.g. AM5 or LGA1851.

AM51Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026

AM51Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026

ChipsetiChipset with its brand and without the word chipset, e.g. AMD B850, AMD X870E or Intel Z890. Same form as desktop PCs and as compatible chipsets on CPUs.

AMD B8401Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026

AMD X8701Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026

Supported processorsiProcessor series the maker lists for the board, one item per series in the chip maker's name. BIOS updates can add series later.

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.

AMD Ryzen 9000 Series, AMD Ryzen 8000 Series, AMD Ryzen 7000 Series1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026AM5 for Ryzen 9000, 8000 and 7000 Series. The page refers to the ASUS site for the CPU support list. Read on 2026-10-16.

CPU overclockingiThe board allows multiplier overclocking of an unlocked CPU. Memory overclocking alone does not count.

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.

Yes2Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifiRead 16 October 2026The page lists Dynamic OC Switcher, Core Flex and AI Overclocking for the CPU. AMD's chipset page also says an X870 board is fully overclockable.6Maker product pageamd.com/en/products/processors/chipsets/am5.htmlRead 16 October 2026AMD's chipset page says an AMD X870 motherboard is fully overclockable. This is the chip maker's page, not the board maker's.

Board

2 of 5 differ

Form factoriThe maker's stated board standard. Other covers sizes such as XL-ATX or Mini-DTX.

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).

ATX2Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifiRead 16 October 2026ATX form factor, from the manual.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_X870-A_GAMING_WIFI/E26407_ROG_STRIX_X870-A_GAMING_WIFI_EM_V3_WEB.pdfRead 16 October 2026Specifications summary: ATX Form Factor.

Board dimensionsiSize of the board itself. Height runs along the rear I/O edge, as the board stands in a tower case. ATX is 244 mm wide and 305 mm high. Micro ATX is 244 mm high and up to 244 mm wide. A size with a cover that reaches past the board, as NZXT prints, is not used when the maker also states the board size.

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).

Width244Height305mm(9.6 × 12 in)3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_X870-A_GAMING_WIFI/E26407_ROG_STRIX_X870-A_GAMING_WIFI_EM_V3_WEB.pdfRead 16 October 2026Specifications summary: 12 inch x 9.6 inch (30.5 cm x 24.4 cm).

PCB layersiCopper layers in the circuit board as published.

62Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 2026Six-layer PCB design.

82Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifiRead 16 October 2026Overview page: Eight-Layer PCB.

Back-connect designiPower, fan and front-panel connectors sit on the back of the board to hide the cables, e.g. ASUS BTF, MSI Project Zero or GIGABYTE Stealth. It needs a case made for it.

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.

No3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_X870-A_GAMING_WIFI/E26407_ROG_STRIX_X870-A_GAMING_WIFI_EM_V3_WEB.pdfRead 16 October 2026The layout shows the usual front-side power, fan and USB connectors. The board is not a back-connect design.

RGB lighting on the boardiLEDs on the board itself. Headers for external lighting are counted under Internal connectors. True only when the maker's spec or feature list names lighting on the board. A single small LED that a reviewer sees does not count.

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.

Yes2Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifiRead 16 October 2026The overview page lists Aura Lighting and says subtle RGB lighting on the I/O shroud.9Reviewpokde.net/review/asus-rog-strix-x870-a-gaming-wifi-reviewRead 16 October 2026The only onboard RGB lighting is on the top left, covering the left VRM heatsink.

Power delivery

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Power stage layoutiAs the maker publishes it, e.g. 18+2+2. The first number is the CPU core (Vcore) rail. Makers group the other rails differently, so compare the first number. Doubled or teamed stages are written as the maker prints them, such as MSI's 12+2+1 Duet Rail. A review's count of real phases goes in the source note.

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.

16+2+22Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifiRead 16 October 202616(90A)+2(90A)+2(80A) power stages: 16 Vcore, 2 SoC and 2 Misc.

CPU core (Vcore) power stagesiPower stages on the Vcore rail. Makers call them phases or power stages. A doubled design has more stages than controller phases. Use the first number of the maker's layout, such as 14 for MSI's 14+2+1 Duet Rail. A review's different count goes in the source note.

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.

162Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifiRead 16 October 202616 Vcore power stages (90A).

Vcore power stage ratingiCurrent rating of each Vcore power stage. Only a figure the maker or a copy of the maker's text states. A review's reading of the chip markings is not enough.

Not available

90A2Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifiRead 16 October 2026Each Vcore power stage is rated 90 A. The SoC stages are also 90 A and the Misc stages 80 A.

VRM controlleriPWM controller chip with maker, e.g. MPS MP2857. One name: the maker's when published, otherwise the one name a review uses. No parentheses. Other names go in the source note. Use the part number without the date code in the chip marking.

Not available

ASUS ASP22069Reviewpokde.net/review/asus-rog-strix-x870-a-gaming-wifi-reviewRead 16 October 2026Spec table and VRM section: PWM controller ASUS DIGI+ EPU ASP2206, with MPS MP87691 90 A stages for Vcore and SoC and Vishay SiC629 80 A for Misc. ASUS does not name the controller. Single review. Stored as ASUS ASP2206, the same form as the ASUS TUF GAMING X870-PLUS WIFI product.

CPU power connectorsiEPS 12 V connectors for the CPU as pin counts, e.g. 8+8 pin, 8+4 pin or 8 pin.

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.

8+8 pin1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026Internal connectors: 2 x 8-pin +12V CPU power connectors and the 24-pin main power connector.

Extra slot power connectoriA PCIe or other power connector on the board that feeds the expansion slots. The 24-pin and CPU connectors do not count. A connector the maker ties only to a front USB-C header does not count.

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.

No1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026The internal connector list has no extra slot power connector.

Memory

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Memory type

DDR51Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 20264 x DIMM slots, DDR5, dual channel.

DDR51Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026

Memory slotsiDIMM slots on the board.

41Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026

41Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026

Max memoryiMaximum total capacity the maker states for the board. The maker's product page wins over an older manual, since a BIOS update can raise the value.

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.

256GB1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 20264 x DIMM slots, max. 256GB, DDR5, the same in the manual.

Max memory speed (overclocked)iHighest overclocked speed the maker lists for one module per channel, with the newest CPU family the board is sold for, e.g. Ryzen 9000 or Core Ultra 200S. Ryzen 8000 values are never used. The source note names the family and the other module setups. It is not the CPU's official speed. A JEDEC-only list such as 5600/4800 is not this value. When the maker lists a manual overclock and a memory profile speed, the higher one is stored. The maker's product page wins over an older manual, since a BIOS update can raise the value. A table that names the CPU family wins over a headline speed that names none.

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.

8,000MT/s1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026Up to 8000+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.

ECC memoryiThe board runs unbuffered ECC modules with ECC active. A board that runs ECC modules in non-ECC mode does not count. DDR5 on-die ECC does not count. A maker list of ECC and non-ECC unbuffered memory with no non-ECC mode qualifier counts as true, as on ASUS and ASRock AM5 boards. A note that ECC mode depends on the CPU, as ASUS writes for AM4 boards, still counts as true.

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.

Yes1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026The page lists ECC and non-ECC unbuffered memory. It does not say how ECC works with each CPU. Non-ECC DDR5 supports On-Die ECC.

CUDIMM supportiThe board runs clocked unbuffered DIMMs (CUDIMM) with the clock driver active. Clock driver bypass mode only does not count. A plain "Supports CUDIMM" with no bypass limit, as ASRock and ASUS write it, counts as true.

Not available

Not available

Expansion slots

3 of 3 differ

Expansion slotsiPhysical card slots. Storage M.2 slots are listed under Storage. The M.2 slot of a pre-installed Wi-Fi module is not listed. A full-length slot wired for x4 is PCIe x16 with 4 lanes.

AASUS PRIME B840-PLUS WIFI

Physical slot	Electrical lanes	PCIe generation	Connected to	Count
PCIe x16	16	4	CPU	1
PCIe x16	4	3	Chipset	1
PCIe x16	1	3	Chipset	2
PCIe x1	1	3	Chipset	1

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.

BASUS ROG STRIX X870-A GAMING WIFI

Physical slot	Electrical lanes	PCIe generation	Connected to	Count
PCIe x16	16	5	CPU	1
PCIe x16	4	4	Chipset	1

Source1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026Ryzen 9000 and 7000: 1 x PCIe 5.0 x16 slot (x16 mode). Ryzen 8000: PCIe 4.0 x16 at x8 or x4. Chipset: 1 x PCIe 4.0 x16 slot at x4. M.2_2 shares bandwidth with PCIEX16(G5), which runs x8 when M.2_2 holds an SSD. M.2_3 shares bandwidth with PCIEX16(G4), which is disabled when M.2_3 holds an SSD.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_X870-A_GAMING_WIFI/E26407_ROG_STRIX_X870-A_GAMING_WIFI_EM_V3_WEB.pdfRead 16 October 2026Shared bandwidth tables: PCIEX16(G5) runs x8 when M.2_2 is occupied. PCIEX16(G4) is disabled when M.2_3 is occupied.

Full-length PCIe slotsiCounts full-length slots, whatever their lane count.

4=CalculatedFrom Expansion slots

2=CalculatedFrom Expansion slots

Fastest PCIe x16 slot generationiHighest PCIe generation of a full-length slot. This is normally the graphics card slot.

4=CalculatedFrom Expansion slots

5=CalculatedFrom Expansion slots

Storage

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M.2 storage slotsiOne row per M key storage slot on the board, front or back. Slots on an included add-in card are not listed. Values are with the CPU family that gives the board its full connectivity. A slot listed for 25110 counts as M.2 22110. A slot listed for 2260 counts as M.2 2280.

AASUS PRIME B840-PLUS WIFI

Slot	PCIe generation	PCIe lanes	Connected to	Longest drive	Takes SATA drives	Heatsink
M.2_1	4	4	CPU	M.2 2280	No	Yes
M.2_2	4	4	CPU	M.2 2280	No	No
M.2_3	3	4	Chipset	M.2 2280	No	No

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.

BASUS ROG STRIX X870-A GAMING WIFI

Slot	PCIe generation	PCIe lanes	Connected to	Longest drive	Takes SATA drives	Heatsink	Shares lanes with
M.2_1	5	4	CPU	M.2 2280	No	Yes	Not available
M.2_2	5	4	CPU	M.2 22110	No	Yes	PCIEX16(G5) slot runs at x8 when M.2_2 is used
M.2_3	4	4	Chipset	M.2 2280	No	Yes	PCIEX16(G4) slot is disabled when M.2_3 is used
M.2_4	4	4	Chipset	M.2 2280	No	Yes	Not available

Source1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026Ryzen 9000 and 7000: M.2_1 (type 2242/2260/2280) and M.2_2 are PCIe 5.0 x4. The page says type 2280/22110 for M.2_2 and the manual says 2242/2260/2280/22110. Ryzen 8000: M.2_1 runs PCIe 4.0 x4 or x2 and M.2_2 is not supported. Chipset: M.2_3 and M.2_4 are type 2280, PCIe 4.0 x4. The page lists only PCIe modes for the slots, so SATA is false.2Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifiRead 16 October 20264 x M.2 heatsinks and an M.2 backplate. The page says the heatsinks cover every slot.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_X870-A_GAMING_WIFI/E26407_ROG_STRIX_X870-A_GAMING_WIFI_EM_V3_WEB.pdfRead 16 October 2026Specifications summary lists the M.2 types and PCIe modes per CPU family. M.2_2 will be disabled with a Ryzen 8000 processor.9Reviewpokde.net/review/asus-rog-strix-x870-a-gaming-wifi-reviewRead 16 October 2026The primary SSD heatsink is large and the secondary heatsink is shared across three slots.

M.2 slots

3=CalculatedFrom M.2 storage slots

4=CalculatedFrom M.2 storage slots

PCIe 5.0 M.2 slots

0=CalculatedFrom M.2 storage slots

2=CalculatedFrom M.2 storage slots

SATA portsiSATA 6Gb/s connectors on the board. SlimSAS connectors and M.2 slots that take SATA drives do not count.

41Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Storage: 4 x SATA 6Gb/s ports.

21Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 20262 x SATA 6Gb/s ports. AMD RAIDXpert2 supports SATA RAID 0/1.

Rear ports

5 of 5 differ

Rear portsiPhysical connectors on the rear I/O panel. Wi-Fi antenna connectors and buttons are not ports. 3.5 mm audio counts analog jacks of any role. A video input, such as the DisplayPort In of a Thunderbolt board, is Other.

AASUS PRIME B840-PLUS WIFI

Type	Version	Count	Max link rate (Gbps)
USB-C	USB 3.2 Gen 2	1	10
USB-A	USB 3.2 Gen 2	1	10
USB-A	USB 3.2 Gen 1	2	5
USB-A	USB 2.0	4	0.48
DisplayPort	DisplayPort 1.4	1	Not available
HDMI	HDMI 2.1	1	Not available
Ethernet (RJ45)	Not available	1	2.5
3.5 mm audio	Not available	3	Not 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.

BASUS ROG STRIX X870-A GAMING WIFI

Type	Version	Count	Max link rate (Gbps)	Thunderbolt or USB4	Power out (W)	DP Alt Mode
USB-C	USB4	2	40	USB4	15	Yes
USB-C	USB 3.2 Gen 2	1	10	Not available	30	Not available
USB-A	USB 3.2 Gen 2	5	10	Not available	Not available	Not available
USB-A	USB 3.2 Gen 1	4	5	Not available	Not available	Not available
DisplayPort	DisplayPort 1.4	1	Not available	Not available	Not available	Not available
HDMI	HDMI 2.1	1	Not available	Not available	Not available	Not available
Ethernet (RJ45)	Not available	1	2.5	Not available	Not available	Not available
3.5 mm audio	Not available	2	Not available	Not available	Not available	Not available
Optical S/PDIF	Not available	1	Not available	Not available	Not available	Not available

Source1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026Back panel list: 2 USB4 (40Gbps) Type-C with DP Alt mode, 6 USB 10Gbps (5 Type-A and 1 Type-C with up to 30W PD fast charge), 4 USB 5Gbps Type-A, 1 DisplayPort (DisplayPort 1.4, the page says max 8K@30Hz and the manual 8K@60Hz), 1 HDMI (4K@60Hz as specified in HDMI 2.1), 1 Intel 2.5Gb Ethernet, 2 audio jacks, 1 optical S/PDIF out, the Wi-Fi module, a BIOS FlashBack button and a Clear CMOS 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 USB4 ports have Type-C power delivery output of max. 5V/3A, stored as 15 W, and DisplayPort 1.4a output up to 4K@60Hz. The 10Gbps Type-C port has 5V/9V max 3A, 12V max 2.5A and 15V max 2A, stored as 30 W.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_X870-A_GAMING_WIFI/E26407_ROG_STRIX_X870-A_GAMING_WIFI_EM_V3_WEB.pdfRead 16 October 2026The manual's back panel list is the same as the product page, with DisplayPort 1.4 at max 8K@60Hz.

Rear USB ports

8=CalculatedFrom Rear ports

12=CalculatedFrom Rear ports

Rear USB-C portsiIncludes Thunderbolt and USB4 ports.

1=CalculatedFrom Rear ports

3=CalculatedFrom Rear ports

Fastest rear USB port

10Gbps=CalculatedFrom Rear ports

40Gbps=CalculatedFrom Rear ports

ThunderboltiThunderbolt on the rear panel. A header for an add-in card does not count.

Not available

No=CalculatedFrom Rear ports

Internal connectors

3 of 5 differ

Internal USB headersiHeaders for front-panel USB ports. The header count may be left out when the maker states only the front ports served.

AASUS PRIME B840-PLUS WIFI

Header	Max data rate (Gbps)	Headers	Front ports served
USB-C header	5	1	1
USB 3 header (19-pin)	5	1	2
USB 2.0 header (9-pin)	0.48	2	4

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.

BASUS ROG STRIX X870-A GAMING WIFI

Header	Max data rate (Gbps)	Headers	Front ports served
USB-C header	20	1	1
USB 3 header (19-pin)	5	2	4
USB 2.0 header (9-pin)	0.48	2	4

Source1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 20261 x USB 20Gbps connector (Type-C, no PD output stated), 2 x USB 5Gbps headers for 4 ports and 2 x USB 2.0 headers for 4 ports.

Front USB-C header speed

5Gbps=CalculatedFrom Internal USB headers

20Gbps=CalculatedFrom Internal USB headers

Fan headersiAll fan and pump headers on the board, including CPU, CPU optional, AIO pump and chassis fan headers. Combination connectors that carry fan power together with other lines, such as MSI EZ Conn, do not count. A header that drives several fans, such as GIGABYTE 3_FANS, counts once. Headers on a hub that ships with the board and plugs into it, such as MSI's EZ CONTROL HUB, count. The source note splits board and hub.

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.

81Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026CPU fan, CPU OPT fan, AIO pump and 5 chassis fan headers, 8 in all. All 4-pin.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_X870-A_GAMING_WIFI/E26407_ROG_STRIX_X870-A_GAMING_WIFI_EM_V3_WEB.pdfRead 16 October 2026Fan and pump header table: CPU_FAN, CPU_OPT, CHA_FAN1 to CHA_FAN5 and AIO_PUMP, 1 A each.

ARGB headersi3-pin 5 V addressable RGB headers. Combination connectors do not count. Headers on a hub that ships with the board and plugs into it, such as MSI's EZ CONTROL HUB, count. The source note splits board and hub.

31Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 20263 x Addressable Gen 2 headers.

31Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 20263 x Addressable Gen 2 headers.

RGB headersi4-pin 12 V RGB headers. Headers on a hub that ships with the board and plugs into it, such as MSI's EZ CONTROL HUB, count. The source note splits board and hub.

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.

01Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026The internal connector list has 3 Addressable Gen 2 headers and no 12 V RGB header.

Networking

5 of 9 differ

Ethernet controllersiOne item per Ethernet chip, as maker plus chip family without suffix letters, e.g. Realtek RTL8126 or Realtek RTL8125. Suffixes and revisions go in the source note. Leave it empty when no maker document or review names the chip. A Killer chip is written with Intel as its maker, such as Intel Killer E3100G.

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.

Intel I2269Reviewpokde.net/review/asus-rog-strix-x870-a-gaming-wifi-reviewRead 16 October 2026Spec table: Intel I226-V 2.5GbE LAN. ASUS writes only Intel 2.5Gb Ethernet. The suffix V is left out.

Ethernet ports

1=CalculatedFrom Rear ports

1=CalculatedFrom Rear ports

Ethernet speediFastest Ethernet port.

2.5Gbps=CalculatedFrom Rear ports

2.5Gbps=CalculatedFrom Rear ports

Wi-Fi includediA Wi-Fi module comes installed. A board sold with and without Wi-Fi is two products.

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).

Yes1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 20261 x Wi-Fi module is listed on the back panel.

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 71Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 20262x2 Wi-Fi 7 (802.11be).

Wi-Fi bandsiBands the installed module supports.

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.

2.4 GHz, 5 GHz, 6 GHz1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026Supports 2.4/5/6GHz. The 6 GHz band and bandwidth vary by country.

Max Wi-Fi channel widthiWidest channel the installed module supports, e.g. 320 or 160. It follows the Wi-Fi module, so a board revision can change it.

Not available

160MHz1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026Wi-Fi 7 160MHz bandwidth, up to 2.9 Gbps.9Reviewpokde.net/review/asus-rog-strix-x870-a-gaming-wifi-reviewRead 16 October 2026The maker states 160 MHz. The review names the MT7925B22M module, which supports 160 MHz.

Wi-Fi moduleiChip as published. A board revision can change the chip. One name: the maker's when published, otherwise the one name a review uses. No parentheses. Other names go in the source note. Use the chip's part number with its maker when any source gives it, such as Qualcomm QCNCM865 for a module also written NCM865. A platform name such as FastConnect 7800 is used only when no part number is published.

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.

MediaTek MT79259Reviewpokde.net/review/asus-rog-strix-x870-a-gaming-wifi-reviewRead 16 October 2026Spec table: MediaTek MT7925B22M (AMD RZ717) Wi-Fi 7 module on M.2 2230, Bluetooth 5.4. The module name MT7925B22M is stored as MT7925.

BluetoothiVersion of the Bluetooth radio on the Wi-Fi module.

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.

5.41Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026Bluetooth v5.4. The page says the version may vary and refers to the Wi-Fi module maker.

Audio

1 of 2 differ

Audio codeciMaker and model, e.g. Realtek ALC4080. A board revision can change the 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.

Realtek ALC40801Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026ROG SupremeFX 7.1 Surround Sound High Definition Audio CODEC ALC4080, with a Savitech SV3H712 amplifier.9Reviewpokde.net/review/asus-rog-strix-x870-a-gaming-wifi-reviewRead 16 October 2026Realtek ALC4080 codec under the SupremeFX cover.

DAC chipiA separate DAC chip next to the codec, e.g. ESS ES9219. Maker plus part number as the maker writes it, with suffix letters, e.g. ESS ES9219Q. A marketing name that stands for a part number is written as the part number, so ESS SABRE9219 is ESS ES9219 and the maker wording goes in the source note. Leave it empty on boards with only a codec.

Not available

Not available

Features

3 of 7 differ

BIOS flashbackiA button that updates the BIOS from a USB drive without a CPU or memory installed. Maker names include BIOS FlashBack, Flash BIOS Button and Q-Flash Plus.

Yes1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026BIOS FlashBack button on the back panel.

Yes1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026BIOS FlashBack button on the back panel.

Clear CMOS button (rear)iA button on the rear panel that resets the BIOS settings. A jumper or header does not count. A board whose only clear CMOS button sits on the board itself is false.

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.

Yes1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 20261 x Clear CMOS button on the back panel list.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_X870-A_GAMING_WIFI/E26407_ROG_STRIX_X870-A_GAMING_WIFI_EM_V3_WEB.pdfRead 16 October 2026The specifications summary lists a Clear CMOS button on the back panel.

POST code displayiA two-digit display that shows boot codes, e.g. ASUS Q-Code or ASRock Dr. Debug. Single status LEDs do not count. Taken from the maker's spec or manual only. A review spec table is not enough.

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.

No1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026Special features list Q-LED with four status LEDs (CPU, DRAM, VGA, boot device). No Q-Code display is listed. Pokde also says a Q-Code is missing.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_X870-A_GAMING_WIFI/E26407_ROG_STRIX_X870-A_GAMING_WIFI_EM_V3_WEB.pdfRead 16 October 2026Layout item 19: Q-LEDs. No two-digit display on the layout.9Reviewpokde.net/review/asus-rog-strix-x870-a-gaming-wifi-reviewRead 16 October 2026System indicators are four Q-LED lights. The review says a Q-Code would have been nice.

Power button on the boardiA power or start button on the board itself, for use outside a case. A button with another label counts when the maker says it can turn the PC on, such as GIGABYTE's quick button labelled RESET. A button on the rear I/O panel counts. A button on a module that ships fitted to the board, such as MSI's EZ BRIDGE, counts.

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.

Yes1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026The internal connector list has a Start button. The manual says it powers up the system.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_X870-A_GAMING_WIFI/E26407_ROG_STRIX_X870-A_GAMING_WIFI_EM_V3_WEB.pdfRead 16 October 2026Layout item 17 is the Start button. The manual says to press it to power up the system or put it into sleep or soft-off mode.

Dual BIOSiTwo BIOS chips, so the board can start from the second chip after a failed update. Two flash chips alone do not count.

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.

No1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026BIOS is a single 256 Mb flash ROM. Dual BIOS is not stated.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_X870-A_GAMING_WIFI/E26407_ROG_STRIX_X870-A_GAMING_WIFI_EM_V3_WEB.pdfRead 16 October 2026Specifications summary: 256 Mb Flash ROM, UEFI AMI BIOS. Dual BIOS is not stated.

Pre-installed I/O shieldiThe rear I/O shield is fixed to the board.

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.

Yes1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026Special features list: Pre-mounted I/O shield.

Tool-free featuresiM.2 latch holds a drive without a screw. M.2 heatsink comes off without a tool. PCIe slot release is a button or lever that frees the graphics card. Push-on antenna connector fits the Wi-Fi antenna without screwing.

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.

Tool-free M.2 latch, Tool-free M.2 heatsink, PCIe slot release, Push-on antenna connector1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026ASUS Q-Design: M.2 Q-Latch, M.2 Q-Release, M.2 Q-Slide, PCIe Slot Q-Release Slim and Q-Antenna. The overview page says the Q-Release switch removes the M.2 heatsink without screws.2Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifiRead 16 October 2026M.2 Q-Release is a switch that removes the M.2 heatsink without tools. The M.2 Q-Latch holds a drive without a screw. Slot Q-Release Slim frees the graphics card.

Measured

1 of 3 differ

VRM temperature under CPU loadiHighest VRM temperature a reviewer measured during a sustained all-core CPU stress test at stock settings. Compare only results from the same reviewer and CPU. The reviewer's probe reading when given, otherwise the board sensor. The sensor and the CPU package power during the test go in the source note.

Not available

45°C10Reviewthefpsreview.com/2024/09/29/asus-rog-strix-x870-a-gaming-wifi-motherboard-reviewRead 16 October 2026Ryzen 9 9950X with Cinebench R23 looping for 20 minutes. HWiNFO64 had unlabeled sensors, so the reviewer used an external laser temperature gun on the heatsinks. The large primary VRM heatsink surface reached 44 C and the smaller VRM heatsink to the north of the CPU reached 45 C. The highest value, 45 C, is stored. This is a heatsink surface reading, not a VRM sensor. The cooler, the CPU package power, the settings and the ambient temperature are not stated.

Power draw idleiWhole test system at the wall at idle, measured by a reviewer. Compare only results from the same reviewer and CPU. A chart of CPU and board power without a wall meter does not count.

Not available

Not available

Power draw CPU stressiWhole test system at the wall at the peak of a CPU stress test, measured by a reviewer. The graphics card is not loaded. Compare only results from the same reviewer and CPU. A chart of CPU and board power without a wall meter does not count.

Not available

Not available

In the box

1 of 1 differ

In the boxiItems as the maker lists them.

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.

2 x SATA 6Gb/s cables, 1 x ASUS WiFi Q-Antenna, 1 x Cable ties package, 1 x M.2 Q-Latch package, 1 x M.2 Q-Slide package, 1 x ROG key chain, 1 x ROG Strix stickers, 4 x M.2 rubber packages, 1 x Quick start guide1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026Accessories list on the specification page, the same as the manual's package contents.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_X870-A_GAMING_WIFI/E26407_ROG_STRIX_X870-A_GAMING_WIFI_EM_V3_WEB.pdfRead 16 October 2026Package contents: 2 SATA cables, WiFi Q-Antenna, cable ties, M.2 Q-Latch package, M.2 Q-Slide package, ROG key chain, ROG Strix stickers, 4 M.2 rubber packages, quick start guide.

Links

Not compared

Product page

www.asus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi2Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 2026

rog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi2Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifiRead 16 October 2026

Spec sheet

www.asus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspec1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026

rog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/spec1Maker product pagerog.asus.com/motherboards/rog-strix/rog-strix-x870-a-gaming-wifi/specRead 16 October 2026

Manual

dlcdnets.asus.com/pub/ASUS/mb/SocketAM5/PRIME_B840-PLUS_WIFI/E24443_PRIME_B840-PLUS_WIFI_EM_WEB.pdf3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/PRIME_B840-PLUS_WIFI/E24443_PRIME_B840-PLUS_WIFI_EM_WEB.pdfRead 15 October 2026PRIME B840-PLUS WIFI User's Manual, English, released 2024-12-26 on the ASUS support page.

dlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_X870-A_GAMING_WIFI/E26407_ROG_STRIX_X870-A_GAMING_WIFI_EM_V3_WEB.pdf3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/ROG_STRIX_X870-A_GAMING_WIFI/E26407_ROG_STRIX_X870-A_GAMING_WIFI_EM_V3_WEB.pdfRead 16 October 2026ASUS user's manual E26407, English edition, Revised Edition V3, July 2025.

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

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Warranty

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Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

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.

3years7Retailer pageeshop.asus.com/us/90mb1if0-m0aay0-rog-strix-x870-a-gaming-wifi.htmlRead 16 October 2026The ASUS US eShop page lists a 3 year manufacturer warranty. Arvutitark in Estonia lists 36 months.

Both are also in the API. Back to all motherboards.