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ASRock B850I Lightning WiFi

ASRockGaming motherboard

B850I Lightning WiFi

Released January 2025.2Press articlegdm.or.jp/pressrelease/2025/0110/570624Read 14 October 2026ASRock Japan press release of 2025-01-10 as copied by Hermitage Akihabara: on sale 2025-01-17. Manual version 1.0 is dated November 2024. Last checked 16 October 2026.

CPU socket
AM5
Chipset
AMD B850
Form factor
Mini-ITX
M.2 slots
2

56 of 78 fields known.

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At a glance

Ports

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

All specs

SourceCalculated

General

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.
Model numbers
B850I Lightning WiFi1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Cover and specification chapter name the board B850I Lightning WiFi.
GTIN / EAN
Not available
Announced
Not available
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.
Predecessor
Not available
Successor
Not available
Launch price (US)
Not available
Launch price (EU)
Not available
Markets
Not available
Colours
Not available
Segment
Gaming2Press articlegdm.or.jp/pressrelease/2025/0110/570624Read 14 October 2026The release calls the B850I Lightning WiFi a Mini-ITX gaming motherboard.
Board revision
Not available

Platform

CPU socket
AM51Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026
Chipset
AMD B8501Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026
Supported processors
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.
CPU overclocking
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.

Board

Front and side, drawn to scale.

Form factor
Mini-ITX1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Specifications, page 2: Mini-ITX form factor.
Board dimensions
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.
PCB layers
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.
Back-connect design
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.
RGB lighting on the board
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.

Power delivery

Power stage layout
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.
CPU core (Vcore) power stages
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.
Vcore power stage rating
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.
VRM controller
Not available
CPU power connectors
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.
Extra slot power connector
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.

Memory

Memory type
DDR51Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026
Memory slots
21Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026
Max memory
128GB1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 2: max. capacity of system memory 128GB.
Max memory speed (overclocked)
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.
ECC memory
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.
CUDIMM support
Not available

Expansion slots

Expansion slots
Physical slotElectrical lanesPCIe generationConnected toCount
PCIe x16165CPU1
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.
Full-length PCIe slots
1
Fastest PCIe x16 slot generation
5

Storage

M.2 storage slots
SlotPCIe generationPCIe lanesConnected toLongest driveTakes SATA drivesHeatsink
M2_154CPUM.2 2280NoYes
M2_244ChipsetM.2 2280NoNo
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.
M.2 slots
2
PCIe 5.0 M.2 slots
1
SATA ports
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.

Rear ports

Rear ports
TypeVersionCountMax link rate (Gbps)DP Alt Mode
USB-CUSB 3.2 Gen 2110Yes
USB-AUSB 3.2 Gen 2210Not available
USB-AUSB 3.2 Gen 115Not available
USB-AUSB 2.040.48Not available
HDMIHDMI 2.11Not availableNot available
Ethernet (RJ45)Not available12.5Not available
3.5 mm audioNot available2Not availableNot available
Optical S/PDIFNot available1Not availableNot 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.
Rear USB ports
8
Rear USB-C ports
1
Fastest rear USB port
10Gbps
Thunderbolt
Not available

Internal connectors

Internal USB headers
HeaderMax data rate (Gbps)HeadersFront ports served
USB-C header511
USB 3 header (19-pin)512
USB 2.0 header (9-pin)0.4812
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.
Front USB-C header speed
5Gbps
Fan headers
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.
ARGB headers
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).
RGB headers
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.

Networking

Ethernet controllers
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.
Ethernet ports
1
Ethernet speed
2.5Gbps
Wi-Fi included
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.
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 bands
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.
Max Wi-Fi channel width
Not available
Wi-Fi module
Not available
Bluetooth
5.21Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 3: supports Bluetooth 5.2.

Audio

Audio 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).
DAC chip
Not available

Features

BIOS flashback
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.
Clear CMOS button (rear)
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.
POST code display
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.
Power button on the board
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.
Dual BIOS
No1Owner's manualdownload.asrock.com/Manual/B850I%20Lightning%20WiFi.pdfRead 14 October 2026Page 5: AMI UEFI Legal BIOS. Dual BIOS is not stated.
Pre-installed I/O shield
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.
Tool-free features
Not available

Measured

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

In the box

In the box
2 x 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.

Warranty

We could not find any of these 1 fields. Show them
Manufacturer warranty (source market)
Not available

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