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Motherboards

B550 UD AC

Model B550 UD AC

AMD B550 ATX motherboard for Socket AM4 processors, with 4 DDR4 slots (up to 128 GB) and Wi-Fi 5.

Socket
AM4
Chipset
AMD B550
Form factor
ATX
Memory
4 x DDR4, up to 128 GB
Wireless
Wi-Fi 5
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Overview Specifications Media Platform and pairing Support
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Overview

Highlights

  • Supports AMD Ryzen 5000 Series/ Ryzen 5000 G-Series/ Ryzen 4000 G-Series/ Ryzen 3000 and Ryzen 3000 G-Series Processors
  • Dual Channel ECC/ Non-ECC Unbuffered DDR4, 4 DIMMs
  • 10+3 Phases Digital Twin Power Design with Low RDS(on) MOSFETs
  • Ultra Durable PCIe 4.0 Ready x16 Slot
  • Two NVMe PCIe 4.0/3.0 x4 M.2 slots
  • GbE LAN with Bandwidth Management

Platform

Socket
AM4
Chipset
AMD B550
Form factor
ATX 30.5 x 24.4 cm
Memory
DDR4
  • 4 DIMM slots
  • Up to 128 GB
  • Up to 4733 MHz (OC)
Dual channel
Processor support
  • AMD Ryzen 5000 series
  • Ryzen 5000 G-series
  • Ryzen 4000 G-series, Ryzen 3000 series and Ryzen 3000 G-series processors
Expansion slots
  • 1 x PCIe x16 slot, up to PCIe 4.0 at x16
  • 4 x PCIe x1 slots, PCIe 3.0 at x1
Storage
2 x M.2
  • 4 x SATA 6Gb/s
Fastest M.2 slot: PCIe 4.0 x4
LAN
  • Realtek GbE LAN
Wireless
Bluetooth 5.0 AzureWave Wi-Fi AW-CB304NF
Display outputs
1 x HDMI For processors with integrated graphics
Power inputs
  • 24-pin ATX
  • 1 x 8-pin ATX 12V

At a glance

Platform
AMD
Socket
AM4
Chipset
B550
Form factor
ATX
Memory
DDR4
Wireless
Wi-Fi 5
Series
Ultra Durable
Full specifications

Specifications

Platform

CPU
AMD Socket AM4, support for: AMD Ryzen 5000 Series/ Ryzen 5000 G-Series/ Ryzen 4000 G-Series, Ryzen 3000 Series and Ryzen 3000 G-Series Processors
Chipset
AMD B550
Memory
4 x DDR4 DIMM sockets supporting up to 128 GB (32 GB single DIMM capacity) of system memorySupport for DDR4 4733(O.C.) / 4600(O.C.) / 4400(O.C.) / 4266(O.C.) / 4133(O.C.) / 4000(O.C.) / 3866(O.C.) / 3733(O.C.) / 3600(O.C.) / 3466(O.C) / 3400(O.C.) / 3200/2933/2667/2400/2133 MHz memory modulesDual channel memory architectureSupport for ECC Un-buffered DIMM 1Rx8/2Rx8 memory modules** ECC memory (ECC mode) support varies by CPUSupport for non-ECC Un-buffered DIMM 1Rx8/2Rx8/1Rx16 memory modulesSupport for Extreme Memory Profile (XMP) memory modules(The CPU and memory configuration may affect the supported memory types, data rate (speed), and number of DRAM modules, please refer to "Memory Support List" on GIGABYTE's website for more information.)

Graphics and audio

Onboard graphics
Integrated Graphics Processor with AMD Radeon Graphics support:1 x HDMI port, supporting a maximum resolution of 4096x2160@60 Hz* Support for HDMI 2.1 version, HDCP 2.3, and HDR.(Graphics specifications may vary depending on CPU support.)Maximum shared memory of 16 GB
Audio
Realtek Audio CODECHigh Definition Audio2/4/5.1/7.1-channel* You can change the functionality of an audio jack using the audio software. To configure 7.1-channel audio, access the audio software for audio settings.

Networking

LAN
Realtek GbE LAN chip (1 Gbps/100 Mbps/10 Mbps)
Wireless communication module
AzureWave Wi-Fi AW-CB304NF (Realtek RTL8821CE)WIFI 802.11a, b, g, n, ac, supporting 2.4/5 GHz Dual-BandBLUETOOTH 5.0Support for 11ac wireless standard and up to 433 Gbps data rate

Expansion and storage

Expansion slots
1 x PCI Express x16 slot (PCIEX16), integrated in the CPU:AMD Ryzen 5000 Series* Processors/AMD Ryzen 3000 Series Processors support PCIe 4.0 x16 modeAMD Ryzen 5000 G-Series/4000 G-Series/3000 G-Series Processors support PCIe 3.0 x16 mode* For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot.4 x PCI Express x1 slots, integrated in the Chipset:Supporting PCIe 3.0 x1 mode
Storage interface
1 x M.2 connector (M2A_CPU), integrated in the CPU, supporting Socket 3, M key, type 2242/2260/2280/22110 SSDs:AMD Ryzen 5000 Series/3000 Series Processors support SATA and PCIe 4.0 x4/x2 SSDsAMD Ryzen 5000 G-Series/4000 G-Series/3000 G-Series Processors support SATA and PCIe 3.0 x4/x2 SSDs1 x M.2 connector (M2B_SB), integrated in the Chipset, supporting Socket 3, M key, type 2242/2260/2280/22110 SSDs:Supporting SATA and PCIe 3.0 x4/x2 SSDs4 x SATA 6Gb/s connectors, integrated in the ChipsetSupport for RAID 0, RAID 1, and RAID 10

Ports and connectors

USB
CPU:AMD Ryzen 5000 Series/3000 Series Processors support one USB 3.2 Gen 2 Type-A port (red) on the back panelAMD Ryzen 5000 G-Series/4000 G-Series/3000 G-Series Processors support one USB 3.2 Gen 1 port (red) on the back panel1 x USB Type-C port on the back panel, with USB 3.2 Gen 1 support2 x USB 3.2 Gen 1 ports on the back panelChipset:1 x USB Type-C port with USB 3.2 Gen 1 support, available through the internal USB header2 x USB 3.2 Gen 1 ports available through the internal USB header4 x USB 2.0/1.1 ports available through the internal USB headersChipset+USB 2.0 Hub:4 x USB 2.0/1.1 ports on the back panel
Internal I/O connectors
1 x 24-pin ATX main power connector1 x 8-pin ATX 12V power connector1 x CPU fan header1 x water cooling CPU fan header3 x system fan headers2 x addressable LED strip headers2 x RGB LED strip headers1 x CPU cooler LED strip/RGB LED strip header2 x M.2 Socket 3 connectors4 x SATA 6Gb/s connectors1 x front panel header1 x front panel audio header1 x USB Type-C port, with USB 3.2 Gen 1 support1 x USB 3.2 Gen 1 header2 x USB 2.0/1.1 headers1 x Trusted Platform Module (TPM) header (2x6 pin, for the GC-TPM2.0_S module only)1 x Clear CMOS jumper
Back panel connectors
4 x USB 2.0/1.1 ports2 x SMA antenna connectors (1T1R)1 x HDMI port1 x USB 3.2 Gen 2 Type-A*/USB 3.2 Gen 1 port (red)* For AMD Ryzen 5000 Series/3000 Series Processors only.1 x USB Type-C port, with USB 3.2 Gen 1 support1 x Q-Flash Plus button1 x RJ-45 port2 x USB 3.2 Gen 1 ports3 x audio jacks
I/O controller
iTE I/O Controller Chip

Firmware and software

H/W monitoring
Voltage detectionTemperature detectionFan speed detectionWater cooling flow rate detectionFan fail warningFan speed control* Whether the fan speed control function is supported will depend on the cooler you install.
BIOS
1 x 128 Mbit flashUse of licensed AMI UEFI BIOSPnP 1.0a, DMI 2.7, WfM 2.0, SM BIOS 2.7, ACPI 5.0
Unique features
Support for APP Center@BIOSEasyTuneRGB FusionSmart BackupSystem Information ViewerSupport for Q-Flash PlusSupport for Q-Flash
Bundle software
Norton Internet Security (OEM version)LAN bandwidth management software
Operating system
Support for Windows 11 64-bitSupport for Windows 10 64-bit

Board

Form factor
ATX Form Factor; 30.5cm x 24.4cm
Remark
Due to different Linux support condition provided by chipset vendors, please download Linux driver from chipset vendors' website or 3rd party website.Most hardware/software vendors may no longer offer drivers to support Win9X/ME/2000/XP. If drivers are available from the vendors, we will update them on the GIGABYTE website.

Specifications are taken from the manufacturer's published information and may change. Confirm critical values with our sales desk before ordering.

GIGABYTE product page

Media

Photos 3

Downloads

Official information

GIGABYTE product page for B550 UD AC gigabyte.com

Platform and pairing

Processor and memory

Supplied by brand rather than listed by model. Name the part you need in your enquiry.

Graphics cards

A spread of current cards, from top tier to entry level. Each card page lists its length and recommended power supply.

All 68 graphics cards

Power supplies

Ratings from 400 W to 3000 W. This board's power inputs: 24-pin ATX and 1 x 8-pin ATX 12V. Size the supply to the recommended PSU of the graphics card you fit.

All 229 power supplies

CPU coolers for AM4

Coolers whose specifications list socket AM4.

All 8 CPU coolers
  • GIGABYTE GP-GIGABYTE GME 240

    GIGABYTE

    GAMING 240

    GP-GIGABYTE GME 240

    • 240 mm
    • 2 x 120 mm
    • Intel 1851/1700/115X/1200, AMD AM5/AM4
    View details
  • GIGABYTE GP-GIGABYTE GME 240I

    GIGABYTE

    GAMING 240 ICE

    GP-GIGABYTE GME 240I

    • 240 mm
    • 2 x 120 mm
    • Intel 1851/1700/115X/1200, AMD AM5/AM4
    View details
  • GIGABYTE GP-GIGABYTE EAGLE 360

    GIGABYTE

    EAGLE 360

    GP-GIGABYTE EAGLE 360

    • 360 mm
    • 3 x 120 mm
    • Intel 1851/1700/115X/1200, AMD AM5/AM4
    View details

Cabinets for ATX boards

Cabinets whose specifications list ATX motherboard support.

All 10 cabinets

Parts to plan with this motherboard

Check sockets, memory type, power connectors and dimensions against the specifications before ordering, or ask our sales desk to confirm a build.

Support

Warranty and repairs

Warranty is as per GIGABYTE’s terms for this model. For products bought from us, call our service team with the invoice number, the model and the product’s serial number.

From GIGABYTE

Practical notes

  1. Update the BIOS only from the official support page, following the brand’s instructions.
  2. Check the CPU support list for the BIOS version before buying a processor.
  3. Install chipset, LAN and audio drivers from the official support page.

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Pairs with

GIGABYTE B550 UD AC 1 / 3