Gigabyte factory refurbished unit, comes with I/O shield, Wi-Fi antenna, and SATA cable only, repacked in Gigabyte service white box.

Model

Brand	GIGABYTE
Model	B550 UD AC

Supported CPU

CPU Socket Type	AM4
CPU Type	Ryzen 3000 Series / Ryzen 4000G Series / Ryzen 5000 Series / Ryzen 5000G Series

Chipsets

Chipset	AMD B550

Memory

Number of Memory Slots	4x288pin (DDR4)
Memory Standard	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
Maximum Memory Supported	128GB
Channel Supported	Dual Channel
ECC Supported	Support for ECC Un-buffered DIMM 1Rx8/2Rx8 memory modules* * ECC memory (ECC mode) support varies by CPU Support for non-ECC Un-buffered DIMM 1Rx8/2Rx8/1Rx16 memory modules
Buffer Supported	Un-buffered
Memory Feature	Support for Extreme Memory Profile (XMP) memory modules

Expansion Slots

PCI Express 4.0 x16	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 mode AMD Ryzen 5000 G-Series/4000 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.
PCI Express x1	4 x PCI Express x1 slots, integrated in the Chipset: Supporting PCIe 3.0 x1 mode

Storage Devices

SATA 6Gb/s	4 x SATA 6Gb/s
M.2	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 SSDs AMD Ryzen 5000 G-Series/4000 G-Series Processors support SATA and PCIe 3.0 x4/x2 SSDs 1 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 SSDs
SATA RAID	0/1/10

Onboard Audio

Audio Channels	Realtek Audio CODEC High Definition Audio 2/4/5.1/7.1-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.

Onboard LAN

LAN Chipset	Realtek GbE LAN chip
Max LAN Speed	Realtek Wi-Fi RTL8821CE WIFI 802.11a, b, g, n, ac, supporting 2.4/5 GHz Dual-Band
Wireless LAN	Wi-Fi 802.11 ac
Bluetooth	Bluetooth 4.2

Rear Panel Ports

Back I/O Ports	4 x USB 2.0/1.1 ports 2 x SMA antenna connectors (1T1R) 1 x HDMI port 1 x USB 3.2 Gen 2 Type-A port (red) 1 x USB Type-C port, with USB 3.2 Gen 1 support 1 x Q-Flash Plus button 1 x RJ-45 port 2 x USB 3.2 Gen 1 ports 3 x audio jacks

Internal I/O Connectors

Onboard USB	1 x USB Type-C port, with USB 3.2 Gen 1 support 1 x USB 3.2 Gen 1 header 2 x USB 2.0/1.1 headers
Other Connectors	1 x CPU fan header 1 x water cooling CPU fan header 3 x system fan headers 2 x addressable LED strip headers 2 x RGB LED strip headers 1 x CPU cooler LED strip/RGB LED strip header 2 x M.2 Socket 3 connectors 4 x SATA 6Gb/s connectors 1 x front panel header 1 x front panel audio header 1 x Trusted Platform Module (TPM) header (2x6 pin, for the GC-TPM2.0_S module only) 1 x Clear CMOS jumper

Physical Spec

Form Factor	ATX
Dimensions (W x L)	12.0" x 9.6"
Power Pin	1 x 24-pin ATX main power connector 1 x 8-pin ATX 12V power connector

Windows 11 Compatibility

Windows 11	Supported

Features

Features	Support for APP Center * Available applications in APP Center may vary by motherboard model. Supported functions of each application may also vary depending on motherboard specifications. @BIOS EasyTune RGB Fusion Smart Backup System Information Viewer Support for Q-Flash Plus Support for Q-Flash Support for Xpress Install