Gigabyte B840M DS3H WIFI6 (Socket AM5) DDR5 Micro-ATX Motherboard

Manufacturer: Gigabyte | Model: B840M | Product ID: 4420
£6.00 (inc. VAT)
Availability: 0 in stock

Product Technical Specification

Form Factor
Motherboard formfactorMicro-ATX
Wi-Fi & LAN
LANYes
LAN Ports1x 2.5 Gbit/s
Wi-Fi / BluetoothYes
Colour
Primary ColourGrey
Lighting
Lighting / RGBYes
Motherboard
Motherboard ChipsetAMD B840
CPU
CPU ManufacturerAMD
CPU SocketAM5
Fan Header
4 Pin Fan Connectors4
Memory
Max. Memory256 GB
Memory TypeDDR5
Memory Form FactorDIMM
Memory slots4x
Internal Ports
CPU Power Supply1x 8-Pin

Delivery Options

Economy Delivery
FREE
Economy Delivery

Economy Delivery (UK)

Estimated delivery date: Thu 27th Aug 2026 to Sun 30th Aug 2026
Fast & Tracked by Courier
£6.95
Fast & Tracked by Courier

Fast & Tracked by Courier (UK)

Estimated delivery date: Wed 26th Aug 2026 to Fri 28th Aug 2026
View all Delivery Options & International Rates
Category Details
CPU AMD Socket AM5, supports AMD Ryzen™ 9000 / 8000 / 7000 Series Processors.
(Check GIGABYTE website for latest CPU support list.)
Chipset AMD B840
Memory DDR5 8200(O.C) – 4400 MT/s, 4 DIMM slots supporting up to 256 GB (64 GB per DIMM), dual channel, non-ECC 1Rx8/2Rx8/1Rx16, AMD EXPO™ & XMP compatible.
Onboard Graphics Integrated AMD Radeon™ Graphics:
- 1 x HDMI (4096x2160@60Hz, HDMI 2.1, HDCP 2.3, HDR)
- 2 x DisplayPort (3840x2160@144Hz, DP 1.4)
- Supports up to triple-display simultaneously
(Specs may vary depending on CPU)
Audio Realtek® Audio CODEC, High Definition Audio, 2/4/5.1/7.1-channel, configurable via software
LAN Realtek® 2.5GbE LAN (2.5/1/0.1 Gbps)
Wireless Realtek® Wi-Fi 6 RTL8851BE, 802.11a/b/g/n/ac/ax, 2.4/5 GHz, Bluetooth 5.3, 11ax 80MHz
Expansion Slots CPU: 1 x PCIe x16 (PCIe 4.0 x16/8/4 depending on CPU)
Chipset: 1 x PCIe x16 (PCIe 3.0 x4)
Storage Interface CPU: 2 x M.2 PCIe 4.0 x4/x2 (M2A_CPU, M2B_CPU)
Chipset: 1 x M.2 PCIe 3.0 x4/x2 (M2C_SB), 4 x SATA 6Gb/s
RAID: NVMe 0/1/5/10 (RAID 5 only Ryzen 9000), SATA 0/1/10
USB CPU: 1 x USB Type-C 3.2 Gen1 (back), 1 x USB 3.2 Gen1 (back), 4 x USB 2.0/1.1 (back)
Chipset: 1 x USB Type-C 3.2 Gen1 (internal), 1 x USB 3.2 Gen1 (back), 2 x USB 3.2 Gen1 (internal), 4 x USB 2.0/1.1 (internal)
Internal I/O Connectors 1 x 24-pin ATX, 1 x 8-pin ATX 12V, CPU/system fan & pump headers, 3 x system fan headers, 2 x addressable RGB headers, 1 x RGB header, 2 x M.2 sockets, 4 x SATA 6Gb/s, front panel headers, USB Type-C 3.2 Gen1 header, Trusted Platform Module header, reset & Clear CMOS jumpers
Back Panel Connectors 1 x HDMI, 2 x DisplayPort, Q-Flash Plus, PS/2 port, 1 x USB Type-C 3.2 Gen1, 2 x USB 3.2 Gen1, 4 x USB 2.0/1.1, 2 x antenna connectors (1T1R), 1 x RJ-45, 3 x audio jacks
I/O Controller iTE® I/O Controller Chip
H/W Monitoring Voltage, Temperature, Fan speed, Water flow, Fan fail warning, Fan speed control
BIOS 256 Mbit flash, AMI UEFI BIOS, PnP 1.0a, DMI 2.7, WfM 2.0, SM BIOS 2.7, ACPI 5.0
Unique Features GIGABYTE Control Center (GCC), Q-Flash, Q-Flash Plus, Smart Backup
Bundled Software Norton® Internet Security (OEM version)
Operating System Windows 11 & Windows 10 64-bit
Form Factor Micro ATX, 24.4cm x 24.4cm
Form Factor
Motherboard formfactorMicro-ATX
Wi-Fi & LAN
LANYes
LAN Ports1x 2.5 Gbit/s
Wi-Fi / BluetoothYes
Colour
Primary ColourGrey
Lighting
Lighting / RGBYes
Motherboard
Motherboard ChipsetAMD B840
CPU
CPU ManufacturerAMD
CPU SocketAM5
Fan Header
4 Pin Fan Connectors4
Memory
Max. Memory256 GB
Memory TypeDDR5
Memory Form FactorDIMM
Memory slots4x
Internal Ports
CPU Power Supply1x 8-Pin

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Buykingston order despatch times:

We will despatch your order the very same day if we receive cleared payment by 12:00 pm Mon-Fri.

These delivery estimates apply when you order up to 12:00 pm Mon-Fri (excluding public holidays).

We charge a one off delivery cost as outlined below regardless of how many items you order or the weight of your order.

Estimated delivery times are provided to us by the respective delivery companies. We pass this information onto you, the customer.

Despatch times do not apply to UK public holidays.

Estimated delivery times are taken from the next available working day available for delivery. For example if an order was despatched on a working Wednesday by 3pm, the first available working day for delivery would be Thursday provided you placed your order by 3pm on the Wednesday. If the next available weekday is a UK bank holiday/public holiday then your order will be despatched on the next available working day.

Our warehouse reserves the right to upgrade the delivery method you select on your order.

Our available delivery options*

Contact us for a shipping quote.

*All delivery times are estimated unless stated.

Product Returns Note

Buykingston offers a simple, hassle-free returns policy. If for whatever reason you are not happy with the item purchased, you can return it to us within 14 days of receipt for a refund. This applies to items purchased direct through Buykingston only.

Our 14 Day Returns Money Back Guarantee:
For items returned in resaleable condition, with all original packaging. If an item has been opened for inspection but shows signs of use beyond that, a deduction may apply to reflect the reduced value — see our full Terms & Conditions (Section 12) for details.

Some items are excluded from our money-back guarantee unless they have developed a fault. These include:

- Headphones
- Earphones
- Custom made and designed products, such as flash memory products with custom logos on them, e.g. USB flash drives and memory cards with your own logo

Returns FAQs

What is your returns criteria?
14 days from date of receipt, or expected date of receipt on non-tracked items.

How do I go about returning my order?
Please contact us via our contact page with your order number. We will provide you with an RMA number and return instructions, including your return deadline and whether a freepost label applies to your order.

Do I need to contact you before returning my order?
Yes, to obtain an RMA number before sending anything back.

Does my item have to include its original packaging?
Yes, to qualify for our 14 day money-back guarantee. For faulty items, we understand you may no longer have the original packaging.

Who pays for return postage?
If your item is faulty, damaged, or not as described, we cover reasonable return postage, or provide a freepost label where available. If you are returning an item for another reason (including simply changing your mind), you are responsible for return postage unless we have expressly confirmed a freepost label in your RMA email — we recommend using a tracked and insured service for items of significant value.

Who deals with the warranty on a faulty item?
We will. In some circumstances we may ask you to contact the manufacturer directly for assistance.

Please ensure you have read and comply in full with Sections 11–13 of our Terms & Conditions.