Pristine condition never used open box.  Professionally tested to ensure 100% functionality.  Bios updated to latest.

Model

Brand	MSI
Model	MPG B550 GAMING PLUS

Supported CPU

CPU Socket Type	AM4
CPU Type	Supports AM4 socket 3rd Gen AMD Ryzen & 4000 & 5000 series

Chipsets

Chipset	AMD B550

Memory

Number of Memory Slots	4x288pin (DDR4)
Memory Standard	Supports DDR4 4400+/ 4266/ 4133/ 4000/ 3866/ 3733/ 3600/ 3466/ 3200/ 3066/ 3000/ 2933/ 2800/ 2667 MHz by A-XMP OC MODE Supports DDR4 3200/ 3066/ 3000/ 2933/ 2800/ 2667/ 2400/ 2133/ 1866 MHz by JEDEC 1DPC 1R max speed 4400 MHz 1DPC 2R max speed 3866 MHz 2DPC 1R max speed 4000 MHz 2DPC 2R max speed 3600 MHz
Maximum Memory Supported	128GB
Channel Supported	Dual Channel

Expansion Slots

PCI Express 4.0 x16	1 x PCIe 4.0/3.0 x16 slot (PCI_E1) * * The supported specification depends on installed processor.
PCI Express 3.0 x16	1 x PCIe 3.0 x16 slot (PCI_E3), supports x4 speed ** ** When installing PCIe SSD in M.2_2, PCI_E3 slot will be unavailable.
PCI Express x16	1 x PCI Express x16
PCI Express x1	2 x PCIe 3.0 x1 slots

Storage Devices

SATA 6Gb/s	6 x SATA 6Gb/s
M.2	2 x M.2 slots (Key M) M2_1 slot (from AMD Processor) Supports PCIe 4.0/3.0 x4 * Supports SATA 6Gb/s Supports 2242/2260/2280/22110 storage devices M2_2 slot (from AMD B550 chipset) Supports PCIe 3.0 x4 Supports 2242/2260/2280 storage devices * The supported specification depends on installed processor.
SATA RAID	0/1/10

Onboard Video

Onboard Video Chipset	Supported only by CPU with integrated graphic: 1 x HDMI port, supports a maximum resolution of 4096×2160 @24Hz 1 x DisplayPort, supports a maximum resolution of 4096×2160 @60Hz Maximum shared memory of 16GB * Available for the processor with integrated graphics.

Onboard Audio

Audio Chipset	Realtek ALC892
Audio Channels	7.1-Channel High Definition Audio Supports S/PDIF output

Onboard LAN

LAN Chipset	Realtek RTL8111H
Max LAN Speed	10/100/1000Mbps

Rear Panel Ports

Back I/O Ports	1 x DisplayPort / 1 x HDMI / 1 x LAN (RJ45) / 1 x Optical S/PDIF Out / 1 x PS/2 Keyboard/Mouse Combo / 1 x USB 3.2 Gen 2 Type-A / 1 x USB 3.2 Gen 2 Type-C / 2 x USB 3.2 Gen 1 / 4 x USB 2.0/1.1 / 5 x Audio Jacks
USB 3.0	4 x USB 3.0

Internal I/O Connectors

Onboard USB	1 x USB 3.2 Gen 1 5Gbps Type-C port 1 x USB 3.2 Gen 1 5Gbps connector (supports additional 2 USB 3.2 Gen 1 5Gbps ports) 2 x USB 2.0 connectors (supports additional 4 USB 2.0 ports)
Other Connectors	1 x 4-pin CPU fan connector 1 x 4-pin water-pump fan connector 6 x 4-pin system fan connectors 1 x Front panel audio connector 2 x System panel connectors 1 x Chassis Intrusion connector 1 x 4-pin RGB LED connector 2 x 3-pin RAINBOW LED connectors 1 x TPM module connector 1 x Clear CMOS jumper

Physical Spec

Form Factor	ATX
LED Lighting	RGB
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 3rd Gen AMD Ryzen Processors and future AMD Ryzen processors with BIOS update Supports DDR4 Memory, up to 4400(OC) MHz Lightning Fast Game experience: PCIe 4.0, Lightning Gen 4 x4 M.2 with M.2 Shield Frozr, AMD Turbo USB 3.2 GEN 2 Enhanced Power Design: Core Boost, Digital PWM IC, 2oz Thickened Copper PCB, DDR4 Boost Premium Thermal Solution: Extended Heatsink Design and M.2 Shield Frozr are built for high performance system and non-stop gaming experience Pre-installed I/O Shielding: Better EMI protection and more convenience for installation Flash BIOS Button with Optmized ClearCMOS Function: Simply use a USB key to flash any BIOS within seconds. Restore the BIOS to the default settings without any additional actions Audio Boost: Reward your ears with studio grade sound quality