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B550-A PRO

    Supports AMD Ryzen™ 5000 & 3000 Series desktop processors (not compatible with AMD Ryzen™ 5 3400G & Ryzen™ 3 3200G) and AMD Ryzen™ 4000 G-Series desktop processors
    Supports DDR4 Memory, up to 4400(OC) MHz
    Lightning Fast Experience: PCIe 4.0, Lightning Gen4 x4 M.2 with M.2 Shield Frozr, AMD Turbo USB 3.2 Gen 2
    Premium Thermal Solution: Extended Heatsink Design with additional choke thermal pad and 7W/mK pad, and M.2 Shield Frozr are built for high performance system and non-stop works
    Powerful Design: Core Boost, Digital PWM IC, 2oz Thickened Copper PCB, Creator Genie, DDR4 Boost
    Audio Boost: Reward your ears with studio grade sound quality
    Multi-GPU: With Steel armor PCI-E slots. Supports 2-Way AMD Crossfire™
    Dragon Center: A brand new software which integrates all MSI exclusive tools with user friendly user interface. 

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CPU (Max Support)
RYZEN 9
Socket
AM4
Chipset
AMD® B550 Chipset
DDR4 Memory
1866/ 2133/ 2400/ 2667/ 2800/ 2933/ 3000/ 3066/ 3200/ 3466/ 3600/ 3733/ 3866/ 4000/ 4133/ 4266/ 4400 + Mhz by JEDEC and A-XMP OC MODE
Memory Channel
Dual
DIMM Slots
4
Max Memory (GB)
128
PCI-E x16
2
PCI-E Gen
Gen4 / Gen3
PCI-E x1
2
SATAIII
6
M.2 Slot
2
RAID
0/1/10
TPM (header)
1
LAN
1x Realtek® RTL8111H Gigabit LAN
USB 3.2 ports (Front)
1(Gen 1, Type C), 2(Gen 1, Type A)
USB 3.2 ports (Rear)
1(Gen 2, Type C), 1(Gen 2, Type A), 2(Gen 1, Type A)
USB 2.0 ports (Front)
4
USB 2.0 ports (Rear)
4
Serial ports(Front)
1
Audio ports (Rear)
Realtek® ALC892/ALC897 Codec
DisplayPort
1
HDMI
1
DirectX
12
Form Factor
ATX
CrossFire
Y
Operating System
Support for Windows® 10 64-bit