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ASUS PRIME B840-PLUS WIFI vs MSI MAG B850 TOMAHAWK MAX WIFI

A

Product A: ASUS

PRIME B840-PLUS WIFI

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B

Product B: MSI

MAG B850 TOMAHAWK MAX WIFI

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Only differences

AASUS PRIME B840-PLUS WIFI

BMSI MAG B850 TOMAHAWK MAX 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.

MAG1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Cover: MAG Series Motherboard.

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.

MAG B850 TOMAHAWK MAX WIFI, 911-7E62-0021Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 202611Maker product pagede-store.msi.com/products/mag-b850-tomahawk-max-wifiRead 14 October 2026MSI's German e-shop: SKU 911-7E62-002.

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.

47113772906232Retailer pageshop.sumanet.cz/mag-b850-tomahawk-max-wifi-msi-mb-sc-am5-mag-b850-tomahawk-max-wifi-amd-b850-4xddr5-1xhdmi-wifi-atxRead 14 October 2026GTIN (EAN) 4711377290623 for type designation MAG B850 TOMAHAWK MAX WIFI. hinta.fi lists the same code.11Maker product pagede-store.msi.com/products/mag-b850-tomahawk-max-wifiRead 14 October 2026Same page: GTIN-13 4711377290623.

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.

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

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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

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

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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.

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ColoursiThe maker's own colour names

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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.

Gaming2Retailer pageshop.sumanet.cz/mag-b850-tomahawk-max-wifi-msi-mb-sc-am5-mag-b850-tomahawk-max-wifi-amd-b850-4xddr5-1xhdmi-wifi-atxRead 14 October 2026The listing repeats MSI's text: designed for gamers with a stable, durable and DIY friendly foundation.

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

AM51Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 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 B8501Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 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 Series1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Specifications chapter, page 17: Ryzen 9000, 8000 and 7000 Series Desktop Processors. The manual refers to msi.com for the newest support status. Read on 2026-10-14.

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.

Yes6Reviewprofesionalreview.com/2025/02/11/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 2026States the B850 board comes with overclocking capability.8Reviewguru3d.com/review/msi-mag-b850-tomahawk-max-wifi-review-great-performance-and-valueRead 14 October 2026Page 1: the board offers decent overclocking headroom for both the CPU and memory.

Board

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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).

ATX1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026

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)1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Specifications chapter: ATX form factor, 9.6 in. x 12 in. (244 mm x 305 mm).

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.

84Reviewtomshardware.com/pc-components/motherboards/msi-mag-b850-tomahawk-max-wifi-motherboard-reviewRead 14 October 2026Black 8-layer server-grade PCB.6Reviewprofesionalreview.com/2025/02/11/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 20268-layer server-grade PCB with 2 oz copper traces.9Reviewtech4gamers.com/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 20268-layered NPG-170D server-grade PCB with 2oz thickened copper.

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.

No1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Component overview pages 28 to 50 show the usual front-side connector layout. The board is not an MSI Project Zero model.

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.

No4Reviewtomshardware.com/pc-components/motherboards/msi-mag-b850-tomahawk-max-wifi-motherboard-reviewRead 14 October 2026RGB lovers must add their own to the headers, as none are built in.9Reviewtech4gamers.com/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 2026There is no onboard RGB, but there are multiple RGB headers.

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.

14+2+13Reviewkitguru.net/components/motherboard/leo-waldock/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 2026Key features list, as in MSI's text: 14+2+1 Duet Rail Power System with 80A Smart Power Stages.6Reviewprofesionalreview.com/2025/02/11/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 202614 phases for Vcore, 2 for SoC and 1 for 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.

143Reviewkitguru.net/components/motherboard/leo-waldock/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 2026VRMs: 14+2+1 x 80A Smart Power Stages.4Reviewtomshardware.com/pc-components/motherboards/msi-mag-b850-tomahawk-max-wifi-motherboard-reviewRead 14 October 202617 phases with 14 dedicated to Vcore. 14 x 80 A gives the 1,120 A the review states.6Reviewprofesionalreview.com/2025/02/11/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 2026The review counts 16 MPS2433 80 A stages for Vcore and SoC, which fits 14 Vcore stages plus 2 SoC stages.

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

80A3Reviewkitguru.net/components/motherboard/leo-waldock/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 202680 A. The Scan listing says 60 A, which no review or MSI text supports.4Reviewtomshardware.com/pc-components/motherboards/msi-mag-b850-tomahawk-max-wifi-motherboard-reviewRead 14 October 202680A MPS MPS2433 SPS MOSFETs.6Reviewprofesionalreview.com/2025/02/11/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 20267Reviewhwcooling.net/en/si-mag-b850-tomahawk-max-wifi-cheaper-chipset-but-better-features-reviewRead 14 October 2026MPS 2433 integrated MOSFETs with a maximum current of 80 A per phase.

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

MPS MPS24123Reviewkitguru.net/components/motherboard/leo-waldock/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 2026Controller is MPS2412 and the power stages are MPS2433.4Reviewtomshardware.com/pc-components/motherboards/msi-mag-b850-tomahawk-max-wifi-motherboard-reviewRead 14 October 2026Power goes to a Monolithic Power Systems MPS2412 controller.6Reviewprofesionalreview.com/2025/02/11/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 2026The phases are controlled by an MPS2412 chip from the same maker.

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 pin1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 19: 2x 8-pin +12V power connectors (CPU_PWR1 and CPU_PWR2).

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.

Yes1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 19 and page 41: 1x 8-pin PCIe power connector (PCIE_PWR1). The special features list also names it.

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.

DDR51Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026

Memory slotsiDIMM slots on the board.

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

41Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 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.

256GB1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026

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.

8,400MT/s2Retailer pageshop.sumanet.cz/mag-b850-tomahawk-max-wifi-msi-mb-sc-am5-mag-b850-tomahawk-max-wifi-amd-b850-4xddr5-1xhdmi-wifi-atxRead 14 October 2026MSI text copied by the shop: Ryzen 9000 Series maximum overclocking frequency 1DPC 1R up to 8400+ MT/s. 1DPC 2R and 2DPC 1R reach 6400+ and 2DPC 2R reaches 4800+.4Reviewtomshardware.com/pc-components/motherboards/msi-mag-b850-tomahawk-max-wifi-motherboard-reviewRead 14 October 2026DDR5-8400 (OC), 1DPC 1R max speed up to 8400+ MT/s, as listed from MSI. The reviewer's stable out-of-box kit was DDR5-7200.

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.

No1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 17: supports non-ECC, unbuffered memory.

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

No1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 17: supports CUDIMM, clock driver bypass mode only. POR boot frequency and support vary by CPU series.

Expansion slots

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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.

BMSI MAG B850 TOMAHAWK MAX WIFI

Physical slot	Electrical lanes	PCIe generation	Connected to	Count
PCIe x16	16	5	CPU	1
PCIe x16	1	3	Chipset	1
PCIe x16	4	4	Chipset	1

Source1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 17: 3x PCIe x16 slots. PCI_E1 from the CPU runs PCIe 5.0 x16 on Ryzen 9000 and 7000, PCIe 4.0 x8 on Ryzen 8700, 8600 and 8400, PCIe 4.0 x4 on Ryzen 8500 and 8300. PCI_E2 is up to PCIe 3.0 x1 and PCI_E3 is up to PCIe 4.0 x4, both from the chipset. PCI_E3 runs at x2 when M2_3 is used. The pre-installed Wi-Fi module sits in an M.2 Key-E slot, which is not listed.

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

4=CalculatedFrom Expansion slots

3=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.

BMSI MAG B850 TOMAHAWK MAX WIFI

Slot	PCIe generation	PCIe lanes	Connected to	Longest drive	Takes SATA drives	Heatsink	Shares lanes with
M2_1	5	4	CPU	M.2 22110	No	Yes	Not available
M2_2	5	4	CPU	M.2 2280	No	Yes	Not available
M2_3	4	2	Chipset	M.2 2280	No	Yes	PCI_E3 slot runs at x2 when M2_3 is used. Setting PCI_E3 to x4 in the BIOS turns off M2_3
M2_4	4	4	Chipset	M.2 2280	No	Yes	Not available

Source1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 18: M2_1 from the CPU, PCIe 5.0 x4 on Ryzen 9000 and 7000, 2280 and 22110. M2_2 from the CPU, PCIe 5.0 x4, 2260 and 2280. M2_3 from the chipset, PCIe 4.0 x2, 2260 and 2280. M2_4 from the chipset, PCIe 4.0 x4, 2260 and 2280. Ryzen 8000 CPUs slow M2_1 and M2_2 to PCIe 4.0 (M2_2 to x2 on Ryzen 8500 and 8300). Page 37 shows M.2 Shield Frozr heatsinks over M2_2 to M2_4, and page 34 the screwless one on M2_1. No slot lists an M.2 SATA mode, so sata is false.

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.

41Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 17: 4x SATA 6Gb/s ports from an ASM1064 controller.

Rear ports

3 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.

BMSI MAG B850 TOMAHAWK MAX WIFI

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

Source1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 20 and page 23: 3 USB 10Gbps Type-C (CPU), 2 USB 10Gbps Type-A (one CPU, one chipset), 1 USB 5Gbps Type-A, 4 USB 2.0 (from a hub), 1 HDMI (2.1 with FRL, graphics only on CPUs with integrated graphics), 1 5G LAN (RJ45), line-out and mic-in jacks, 1 optical S/PDIF out. USB 2.0 is stored as 0.48 Gbps. Flash BIOS and Clear CMOS buttons and the two Wi-Fi antenna connectors are not ports.

Rear USB ports

8=CalculatedFrom Rear ports

10=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

10Gbps=CalculatedFrom Rear ports

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

Not available

Not available

Internal connectors

4 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.

BMSI MAG B850 TOMAHAWK MAX 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

Source1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 19, 43 and 44: 1 USB 20Gbps Type-C front panel header (JUSBC1), 2 USB 5Gbps headers (JUSB2 and JUSB3) that serve 4 more ports, 2 USB 2.0 headers (JUSB4 and JUSB5) that serve 4 more 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.

81Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 19 and page 46: CPU_FAN1, PUMP_SYS1 and SYS_FAN1 to SYS_FAN6 make 8 headers. The EZ Conn-Header V2 (JAF_2) is a combination connector and is not counted.

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.

31Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 19: 3x 3-pin A-RAINBOW V2 (ARGB Gen2) connectors.

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.

11Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 19: 1x 4-pin RGB LED connector (JRGB1).

Networking

6 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.

Realtek RTL81266Reviewprofesionalreview.com/2025/02/11/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 2026Realtek RTL8126VB with 5 Gbps on the RJ-45 port, stored as the chip family RTL8126.7Reviewhwcooling.net/en/si-mag-b850-tomahawk-max-wifi-cheaper-chipset-but-better-features-reviewRead 14 October 2026Realtek 8126VB, 5 GbE.

Ethernet ports

1=CalculatedFrom Rear ports

1=CalculatedFrom Rear ports

Ethernet speediFastest Ethernet port.

2.5Gbps=CalculatedFrom Rear ports

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).

Yes1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026

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 71Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026

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 GHz1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026

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

320MHz1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 19: Supports 2.4GHz, 5GHz and 6GHz (320MHz) up to 5.8Gbps, 802.11 a/b/g/n/ac/ax/be.

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.

Qualcomm QCNCM8656Reviewprofesionalreview.com/2025/02/11/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 2026Qualcomm FastConnect 7800 Wi-Fi 7 card with 320 MHz channels, 4KQAM and Bluetooth 5.4. HWCooling names the module Qualcomm NCM865, which is the part number QCNCM865, so that is stored.7Reviewhwcooling.net/en/si-mag-b850-tomahawk-max-wifi-cheaper-chipset-but-better-features-reviewRead 14 October 2026Qualcomm NCM865 wireless module, Wi-Fi 7 with Bluetooth 5.4. Published 2025-02-27.

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.

5.41Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 19: Bluetooth 5.4, MLO, 4KQAM. The manual says the version may be updated by the Wi-Fi chip vendor.

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 ALC40801Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 18: Realtek ALC4080 codec, 7.1-channel USB audio.

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

2 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.

Yes1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 20 and page 23: Flash BIOS button on the rear 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.

Yes1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 20 and page 23: Clear CMOS button on the rear 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.

No1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 19 and page 51: 4x EZ Debug LED (CPU, DRAM, GPU, boot) and one memory detection LED. No two-digit display is listed.

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.

No1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026The specifications chapter and the onboard LEDs page list no power or reset button on the board. Its only buttons are the two on the rear panel.

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.

No1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 20: BIOS is 1x 256 Mb flash. 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.

Yes1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 21 special features list: Pre-installed I/O Shield.9Reviewtech4gamers.com/msi-mag-b850-tomahawk-max-wifi-reviewRead 14 October 2026The I/O shield is pre-installed on the motherboard, in stainless steel.

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 release1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 21 EZ DIY list: EZ M.2 Shield Frozr II (screwless, on M2_1 only per page 34 and HWCooling), EZ M.2 Clip II and EZ PCIe Release. The Wi-Fi antenna uses the normal threaded connectors per Profesional Review, so the push-on antenna option is not set.7Reviewhwcooling.net/en/si-mag-b850-tomahawk-max-wifi-cheaper-chipset-but-better-features-reviewRead 14 October 2026Tool-free cooler on the first M.2 slot with a release button. The other two SSD coolers use screws. A remote button releases the PCIe slot latch.

Measured

3 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

44°C5Measurementtomshardware.com/pc-components/motherboards/msi-mag-b850-tomahawk-max-wifi-motherboard-review/3Read 14 October 2026Ryzen 9 9900X (CPU averages about 150 W), stock settings, AIDA64 System Stability Test. Peak 44 C on the reviewer's probes and 46 C from the board's integrated sensor. The ambient temperature is 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

74W5Measurementtomshardware.com/pc-components/motherboards/msi-mag-b850-tomahawk-max-wifi-motherboard-review/3Read 14 October 2026Whole test system at the wall with a Kill-A-Watt meter, Windows Balanced power plan, EXPO enabled. Test system: Ryzen 9 9900X, RTX 4080, Crucial T705, Windows 11. The first page says AGESA 1.2.0.3a BIOS.

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

250W5Measurementtomshardware.com/pc-components/motherboards/msi-mag-b850-tomahawk-max-wifi-motherboard-review/3Read 14 October 2026Peak of the whole test system at the wall (Kill-A-Watt) during the AIDA64 System Stability Test with CPU, FPU, cache and memory stress. The graphics card was not stressed.

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.

1 x Quick installation guide, 1 x European Union Regulatory Notices, 1 x SATA cable, 1 x 1 to 3 EZ Conn-Cable (V2), 1 x EZ Front panel cable, 1 x EZ Wi-Fi Antenna, 1 x Cable sticker, 3 x EZ M.2 Clip II, 1 x EZ M.2 Clip II Remover1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026Page 22 package contents.

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

www.msi.com/Motherboard/MAG-B850-TOMAHAWK-MAX-WIFI10Maker product pagemsi.com/Motherboard/MAG-B850-TOMAHAWK-MAX-WIFIRead 14 October 2026The link appears as the manufacturer page on hinta.fi and in web search results. msi.com blocks agents, so the page was not read and its content is not used for any value.

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

Not available

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.

gzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdf1Owner's manualgzhls.at/blob/ldb/4/c/d/0/9505de78491f9bbd3d2c02edb15c90ef238e.pdfRead 14 October 2026MSI MAG B850 TOMAHAWK MAX WIFI User Guide, 68 pages, PDF created 2025-03-24, hosted by Geizhals. The cover names this exact model, not the II model.

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.

3years4Reviewtomshardware.com/pc-components/motherboards/msi-mag-b850-tomahawk-max-wifi-motherboard-reviewRead 14 October 2026US: spec table lists Warranty 3 Years. Tech4Gamers also says MSI offers a 3-year warranty. Scan UK lists 24 months.

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