Motherboards / Compare

ASRock B850I Lightning WiFi vs ASUS PRIME B840-PLUS WIFI

A

Product A: ASRock

B850I Lightning WiFi

56 of 78 known

Change ASRock B850I Lightning WiFi

Compare the ASUS PRIME B840-PLUS WIFI with

Search motherboards

B

Product B: ASUS

PRIME B840-PLUS WIFI

62 of 78 known

Change ASUS PRIME B840-PLUS WIFI

Compare the ASRock B850I Lightning WiFi with

Search motherboards

All 78 fields

Every value links to where we found it.

Only differences

AASRock B850I Lightning WiFi

BASUS PRIME B840-PLUS WIFI

General

4 of 9 differ

Series

Phantom Gaming4Reviewfunkykit.com/reviews/motherboards/asrock-phantom-gaming-b850i-lightning-wifi-motherboard-reviewRead 14 October 2026The review is titled ASRock Phantom Gaming B850I Lightning WiFi.

PRIME2Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 2026PRIME 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.

B850I Lightning WiFi1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Cover and specification chapter name the board B850I Lightning WiFi.

PRIME B840-PLUS WIFI, 90MB1IZ0-M0EAY0, 90MB1IZ0-M0AAY01Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The page names the model PRIME B840-PLUS WIFI. The part numbers 90MB1IZ0-M0EAY0 (Scan UK, the Spanish datasheet) and 90MB1IZ0-M0AAY0 (BuildCores) are from retail sources. The -CSM business version is a separate product.9Retailer pagescan.co.uk/products/asus-prime-b840-plus-wifi-amd-b840-am5-ddr5-pcie-40-3x-m2-25gbe-ax-wifi-6e-bt-usb-10gbps-type-apluscRead 15 October 2026Model number 90MB1IZ0-M0EAY0.10Spec databasebuildcores.com/products/Motherboard/ssmzdxbne/Asus-B840-PRIME-PLUS-WIFI-AM5-DDR5-ATXRead 15 October 2026Part numbers PRIME B840-PLUS WIFI, 90MB1IZ0-M0AAY0 and 90MB1IZ0-M0EAY0.

GTIN / EAN

Not available

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.

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

Not available

6 January 20258Press articlepcgameshardware.de/Mainboard-Hardware-154107/News/AM5-Mainboards-von-Asus-mit-B850-und-B840-ab-209-Euro-1462968Read 15 October 2026Article date 2025-01-06, source credited to ASUS, ASUS presented the boards at CES 2025.

Status

Available7Retailer pageparadigit.ie/asrock-b850i-lightning-wifi/21862530/productRead 14 October 2026Listed as in stock with delivery in 4 to 5 working days on 2026-10-14.

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.

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

Not available

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.

Not available

€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.

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

Not available

Not available

ColoursiThe maker's own colour names

Not available

Not available

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.

Gaming2Press articlegdm.or.jp/pressrelease/2025/0110/570624Read 14 October 2026The release calls the B850I Lightning WiFi a Mini-ITX gaming motherboard.

Mainstream1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026ASUS PRIME is not a gaming, creator or workstation line, so the segment is mainstream.

Board 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

Not available

Platform

2 of 4 differ

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

AM51Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026

AM51Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 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 B8501Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026

AMD B8401Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 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 Series1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Specifications, page 2: AMD Socket AM5 Ryzen 9000, 8000 and 7000 Series Processors. The slot lines depend on the CPU.

AMD Ryzen 9000 Series, AMD Ryzen 8000 Series, AMD Ryzen 7000 Series1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026AM5 for AMD Ryzen 9000, 8000 and 7000 Series Desktop Processors. The page refers to the ASUS download center for the CPU support list. Read on 2026-10-15.

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

Yes4Reviewfunkykit.com/reviews/motherboards/asrock-phantom-gaming-b850i-lightning-wifi-motherboard-reviewRead 14 October 2026The review describes the AMD B850 chipset as having enhanced overclocking capabilities, quoting AMD.8Maker product pageamd.com/en/products/processors/chipsets/am5.htmlRead 14 October 2026AMD's AM5 chipset page says the B850 platform features enhanced overclocking capabilities and lists Ryzen processor overclocking enabled for B850. This is the chip maker's page, not the board maker's.

No6Maker product pageamd.com/en/products/processors/chipsets/am5.htmlRead 15 October 2026AMD's AM5 chipset comparison table has the column Ryzen processor overclocking enabled. It reads No for B840 and Yes for DDR5 memory overclocking with AMD EXPO. This is the chip maker's page and not the board maker's. The ASUS pages state no CPU overclocking for this board.

Board

3 of 5 differ

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

Mini-ITX1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Specifications, page 2: Mini-ITX form factor.

ATX1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026ATX form factor, 12 inch x 9.6 inch (30.5 cm x 24.4 cm).

Board 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.

Width170Height170mm(6.7 × 6.7 in)4Reviewfunkykit.com/reviews/motherboards/asrock-phantom-gaming-b850i-lightning-wifi-motherboard-reviewRead 14 October 2026The board measures 17.0 x 17.0 cm, the Mini-ITX 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).

PCB layersiCopper layers in the circuit board as published.

81Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Specifications, page 2: 8 Layer PCB.4Reviewfunkykit.com/reviews/motherboards/asrock-phantom-gaming-b850i-lightning-wifi-motherboard-reviewRead 14 October 2026The 10+1+1 phase power design sits on a 8-Layer PCB.

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

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.

No1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026The layout on pages 6 and 7 shows the usual front-side power, fan and USB connectors. The board is not a back-connect design.

No1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The manual layout and the maker's photo show the usual front-side power and USB connectors. The board is not a back-connect design.

RGB lighting on the 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.

No4Reviewfunkykit.com/reviews/motherboards/asrock-phantom-gaming-b850i-lightning-wifi-motherboard-reviewRead 14 October 2026The review names ASRock Polychrome RGB and SignalRGB support through the two ARGB headers and describes no lighting on the board.

No1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The Aura Sync list names only the Addressable Gen 2 headers, and the feature list names no lit part of the board. Q-LED Core is a status light. The maker's board photo shows no lit part.

Power delivery

4 of 6 differ

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.

10+1+12Press articlegdm.or.jp/pressrelease/2025/0110/570624Read 14 October 202610+1+1 phase power circuit using 110A SPS.4Reviewfunkykit.com/reviews/motherboards/asrock-phantom-gaming-b850i-lightning-wifi-motherboard-reviewRead 14 October 202610+1+1 Phase Power Design with 110A SPS for VCore, copied from the maker's text.

8+2+12Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 20268+2+1 phase digital power design with discrete MOSFETs: 8 Vcore, 2 SOC and 1 misc. The page lists no current rating for the stages.

CPU core (Vcore) power 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.

105Reviewpcunboxing.com/en/asrock-b850i-lightning-wifiRead 14 October 202610+1+1 phase Dr. MOS SPS: the 10-phase 110A SPS handles CPU Vcore, 1 phase handles SOC and 1 phase VDD MISC.

82Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 2026The power diagram shows 8 Vcore power stages, 2 SOC and 1 misc.

Vcore power stage 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.

110A2Press articlegdm.or.jp/pressrelease/2025/0110/570624Read 14 October 2026110A SPS is stated for the 10+1+1 phase circuit. FunkyKit's copy of the maker's text says 110A SPS for VCore and PC Unboxing says the 10 Vcore phases use 110A stages.4Reviewfunkykit.com/reviews/motherboards/asrock-phantom-gaming-b850i-lightning-wifi-motherboard-reviewRead 14 October 2026110A SPS for VCore, copied from the maker's text.5Reviewpcunboxing.com/en/asrock-b850i-lightning-wifiRead 14 October 2026The 10-phase 110A SPS is responsible for CPU Vcore.

Not available

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

Not available

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

8 pin1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 5: 1x 8 pin 12V power connector (Hi-Density Power Connector, ATX12V1) and the 24-pin ATX connector.

8+4 pin1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Internal connectors: 1 x 8-pin +12V CPU power connector, 1 x 4-pin +12V CPU power connector and the 24-pin main power connector.

Extra slot power 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.

No1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026The connector list on page 5 has no extra slot power connector. FunkyKit's text calls the 8-pin CPU connector a PCIe power connector. The layout shows one 8-pin connector, ATX12V1.

No1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The internal connector list has no extra slot power connector.

Memory

3 of 6 differ

Memory type

DDR51Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026

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

Memory slotsiDIMM slots on the board.

21Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026

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

128GB1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 2: max. capacity of system memory 128GB.

256GB1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The page says max. 256GB. The December 2024 manual says max. 192GB, and retailers copy 192 GB. The page wins as the newer maker statement.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/PRIME_B840-PLUS_WIFI/E24443_PRIME_B840-PLUS_WIFI_EM_WEB.pdfRead 15 October 2026Specifications summary: max. 192GB. The product page says 256GB and wins.

Max memory speed (overclocked)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.

8,200MT/s1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 2: DDR5 up to 8200+(OC). The manual names no CPU family. Ryzen 9000 is the newest family of the board. It refers to the Memory Support List on the maker's website.

7,600MT/s1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Up to 7600+ MT/s (OC) with Ryzen 9000, 8000 and 7000 Series. The Ryzen 9000 value is stored. The page says supported speeds and module counts vary with the CPU and memory configuration. No other CPU or module setup is listed.

ECC 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.

Yes1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 2: supports DDR5 ECC/non-ECC, un-buffered memory. The manual does not say whether ECC works with every CPU.

Yes1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The page lists ECC and non-ECC unbuffered DIMM, and says non-ECC DDR5 supports On-Die ECC. The maker does not say how ECC works with each CPU. A list of ECC and non-ECC modules with no qualifier counts as true.

CUDIMM 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.

AASRock B850I Lightning WiFi

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

Source1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 2: 1x PCIe 5.0 x16 slot (PCIE1) from the CPU. PCIE1 runs Gen5x16 with Ryzen 9000 and 7000, Gen4x8 with Ryzen 8000 (Phoenix 1) and Gen4x4 with Ryzen 8000 (Phoenix 2). The vertical M.2 socket (Key E) for the Wi-Fi module is not listed.

BASUS 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.

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

1=CalculatedFrom Expansion slots

4=CalculatedFrom Expansion slots

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

5=CalculatedFrom Expansion slots

4=CalculatedFrom Expansion slots

Storage

4 of 4 differ

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.

AASRock B850I Lightning WiFi

Slot	PCIe generation	PCIe lanes	Connected to	Longest drive	Takes SATA drives	Heatsink
M2_1	5	4	CPU	M.2 2280	No	Yes
M2_2	4	4	Chipset	M.2 2280	No	No

Source1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 4: M2_1 (Blazing M.2, CPU) takes type 2280 at PCIe Gen5x4, M2_1 runs Gen5x4 with Ryzen 9000 and 7000 and Gen4x4 with Ryzen 8000. M2_2 (Hyper M.2, chipset) takes type 2280 at PCIe Gen4x4. Pages 50 to 55 show an M.2 heatsink with screws on M2_1 and none on M2_2, which is on the back of the board. The manual names no SATA mode for either slot and no lane sharing. FunkyKit and PC Unboxing confirm M2_1 has a heatsink and M2_2 sits on the back, and PC Unboxing says both slots take 2280 only.4Reviewfunkykit.com/reviews/motherboards/asrock-phantom-gaming-b850i-lightning-wifi-motherboard-reviewRead 14 October 20261 x Blazing M.2 (PCIe Gen5x4) with heatsink and 1 x Hyper M.2 (PCIe Gen4x4) on the back of the board.5Reviewpcunboxing.com/en/asrock-b850i-lightning-wifiRead 14 October 2026M2_1 is the only PCIe Gen5 x4 slot (CPU direct) with a single-sided thermal pad to a heatsink. The Hyper M.2 slot on the back is PCIe Gen4 x4. Both take 2280 only.

BASUS 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.

M.2 slots

2=CalculatedFrom M.2 storage slots

3=CalculatedFrom M.2 storage slots

PCIe 5.0 M.2 slots

1=CalculatedFrom M.2 storage slots

0=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.

21Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 4: 2x SATA3 6.0 Gb/s connectors.5Reviewpcunboxing.com/en/asrock-b850i-lightning-wifiRead 14 October 2026Two SATA 6Gb/s connectors.

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

Rear ports

1 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.

AASRock B850I Lightning WiFi

Type	Version	Count	Max link rate (Gbps)	DP Alt Mode
USB-C	USB 3.2 Gen 2	1	10	Yes
USB-A	USB 3.2 Gen 2	2	10	Not available
USB-A	USB 3.2 Gen 1	1	5	Not available
USB-A	USB 2.0	4	0.48	Not available
HDMI	HDMI 2.1	1	Not available	Not available
Ethernet (RJ45)	Not available	1	2.5	Not available
3.5 mm audio	Not available	2	Not available	Not available
Optical S/PDIF	Not available	1	Not available	Not available

Source1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Pages 4 and 9: 1 USB 3.2 Gen2 Type-C (10 Gb/s, DP-alt mode DP1.4a), 2 USB 3.2 Gen2 Type-A (10 Gb/s), 1 USB 3.2 Gen1 Type-A, 4 USB 2.0, 1 HDMI 2.1 (4K 120Hz), 1 RJ-45 2.5G LAN, 1 line out jack, 1 microphone input jack and 1 optical S/PDIF out. The manual notes that the Type-C port supports a maximum speed of 40 Gb/s with selected processors. NoobFeed ties USB4 to 8000G series processors. Ryzen 9000 is the reference family, so 10 Gbps is stored. The BIOS Flashback button and the two antenna ports are not ports.

BASUS 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.

Rear USB ports

8=CalculatedFrom Rear ports

8=CalculatedFrom Rear ports

Rear USB-C portsiIncludes Thunderbolt and USB4 ports.

1=CalculatedFrom Rear ports

1=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

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.

AASRock B850I Lightning 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	1	2

Source1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 5: 1 USB 2.0 header for 2 ports, 1 USB 3.2 Gen1 header for 2 ports and 1 front panel Type-C USB 3.2 Gen1 header. PC Unboxing calls the front Type-C 10Gbps, which conflicts with the manual, so the manual value is stored.

BASUS 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.

Front USB-C header speed

5Gbps=CalculatedFrom Internal USB headers

5Gbps=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.

31Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 5 and the layout: CPU_FAN1, CHA_FAN1 and AIO_PUMP are the three 4-pin fan headers. The thermistor header is not a fan header.

71Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026CPU fan, CPU OPT fan, AIO pump and 4 chassis fan headers, all 4-pin.

ARGB 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.

21Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 5: 2x addressable LED headers (3-pin ADDR_LED1 and ADDR_LED2).

31Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 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.

01Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 5 lists only the two addressable LED headers and the layout shows no 4-pin RGB header.

01Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The internal connector list has 3 Addressable Gen 2 headers and no 12 V RGB header.

Networking

3 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.

Intel Killer E3100G1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 3: 2.5 Gigabit LAN, Killer E3100G. Killer chips are Intel's, so it is written 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.

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.

Yes1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 3: 802.11axe Wi-Fi 6E module in a vertical M.2 (Key E) socket.

Yes1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026A Wi-Fi module is listed on the back panel (1 x Wi-Fi module).

Wi-Fi standard

Wi-Fi 6E1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 3: 802.11axe Wi-Fi 6E, supports IEEE 802.11a/b/g/n/ac/ax/axe.

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 bandsiBands the installed module supports.

2.4 GHz, 5 GHz, 6 GHz1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 3: dual-band 2x2 with extended 6GHz band support, and the box includes 2.4/5/6 GHz antennas. The 6 GHz band depends on country regulation.

2.4 GHz, 5 GHz, 6 GHz1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Supports 2.4/5/6GHz. The 6 GHz band varies by country and needs Windows 11 or later.

Max Wi-Fi channel 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

Not available

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.

Not available

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.

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

5.21Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 3: supports Bluetooth 5.2.

5.31Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Bluetooth v5.3. The page says the version may vary and refers to the Wi-Fi module maker.

Audio

1 of 2 differ

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

Realtek ALC12201Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 3: 7.1 CH HD Audio with Content Protection (Realtek ALC1220 Audio Codec).

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

DAC 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

1 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.

Yes1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 4 and section 2.13: 1x BIOS Flashback button on the rear panel.

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

Clear CMOS button (rear)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.

No1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 8 lists a Clear CMOS jumper (CLRCMOS1). The only rear panel button is BIOS Flashback.

No1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The back panel list has only the BIOS FlashBack button. Clear CMOS is a header on the board.

POST code 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.

No1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026The manual lists no debug display. The layout has none. The power LED table in the system panel header section describes boot states.

No1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Special features list ASUS Q-LED Core, a set of colour-coded status lights. No two-digit Q-Code display is listed.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/PRIME_B840-PLUS_WIFI/E24443_PRIME_B840-PLUS_WIFI_EM_WEB.pdfRead 15 October 2026The layout lists no two-digit display. Q-LED Core is a status light.

Power button on the 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.

No1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026The manual layout lists no power or reset button on the board. Section 2.13 says the only smart button is BIOS Flashback.

No1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026The internal connector list and the special features list name no power or start button on the board. The manual layout shows none.3Owner's manualdlcdnets.asus.com/pub/ASUS/mb/SocketAM5/PRIME_B840-PLUS_WIFI/E24443_PRIME_B840-PLUS_WIFI_EM_WEB.pdfRead 15 October 2026The layout lists no power or start button. The front panel connector has a PWR_BTN header only.

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

No1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 5: AMI UEFI Legal BIOS. Dual BIOS is not stated.

No1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026BIOS is a single 256 Mb flash ROM. Dual BIOS is not stated.

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

Yes6Reviewnoobfeed.com/hardware/asrock-b850i-lightning-wifi-am5-itx-reviewRead 14 October 2026The IO shield is already set up when it comes. The review also names a MediaTek Wi-Fi 6E card without a model, so wifi_module is left out.

Yes1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026Special features list: Pre-mounted I/O shield.2Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 2026Pre-Mounted I/O Shield: the pre-installed shield safeguards the ports.

Tool-free 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.

Not available

Push-on antenna connector1Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifi/techspecRead 15 October 2026ASUS Q-Design lists Q-Antenna, which the overview page describes as a snap-in Wi-Fi antenna connector. Q-DIMM and Q-Slot are also listed, but no read ASUS page says what they do, so they are not stored. The M.2 heatsink and the M.2 SSDs use screws.2Maker product pageasus.com/motherboards-components/motherboards/prime/prime-b840-plus-wifiRead 15 October 2026Q-Antenna: the antenna fasteners snap into place instead of being turned.

Measured

None of 3 known

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

Not available

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 Serial ATA (SATA) data cables, 2 x ASRock WiFi 2.4/5/6 GHz antennas, 2 x screws for M.2 sockets, 1 x Thermistor cable1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 1 package contents, without the board. The manual marks each item Optional. FunkyKit adds an installation guide, a regulatory notice and two velcro straps.

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.

Links

Not compared

Product page

pg.asrock.com/mb/AMD/B850I%20Lightning%20WiFi/index.asp9Maker product pagepg.asrock.com/mb/AMD/B850I%20Lightning%20WiFi/index.aspRead 14 October 2026asrock.com blocks agents, so the page was not read. Its address is from the job brief. No value comes from it.

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

Spec sheet

Not available

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

Manual

download.asrock.com/Manual/B850I%20Lightning%20WiFi.pdf1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026ASRock B850I Lightning WiFi User Manual, version 1.0, published November 2024, 65 pages, English PDF on download.asrock.com.

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.

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.

Not available

Not available

Warranty

1 of 1 differ

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.

Not available

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.

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