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MSI B550-A PRO ATX AM4 PCIe 4.0 Motherboard
Only $164.08
MSI B550-A PRO ATX AM4 PCIe 4.0 Motherboard MSI B550-A PRO ATX AM4 PCIe 4.0 Motherboard MSI B550-A PRO ATX AM4 PCIe 4.0 Motherboard MSI B550-A PRO ATX AM4 PCIe 4.0 Motherboard
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MSI B550-A PRO ATX AM4 PCIe 4.0 Motherboard
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MSI B550-A PRO ATX AM4 PCIe 4.0 Motherboard

SKU 128638 7UD600 New
In Stock

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Item Information

PRO series helps users work smarter by delivering an efficient and productive experience. Featuring stable functionality and high-quality assembly, PRO series motherboards provide not only optimized professional workflows but also less troubleshooting and longevity.


  • Support for 3rd Gen AMD Ryzen™ Processors and future AMD Ryzen™ processors with BIOS update
  • Supports DDR4 Memory, up to 4866+(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: 10+2+1 Duet Rail Power Design, Core Boost, DDR4 Boost
  • MYSTIC LIGHT: 16.8 million colors / 29 effects controlled in one click. MYSTIC LIGHT EXTENSION supports both RGB and RAINBOW LED strip.
  • ATX Form Factor
  • AMD B550 Chipset
  • Socket AM4
  • 4 x Dual-Channel DDR4-4400 (OC)
  • 6 x SATA III, 2 x M.2
  • 1 x PCIe 4.0 x16, 1 x PCIe 3.0 x16 Slots
  • 2 x PCIe 3.0 x1 Slots
  • 7.1-Channel HD Audio
  • Realtek RTL8111H Gigabit LAN


  • MSI PRO Motherboard

MSI B550-A PRO ATX AM4 PCIe 4.0 Motherboard
New items ship in their original manufacturer's packaging. These items are in excellent condition with no blemishes on their housings.

UPC: 00824142219362

B550-A PRO ATX AM4 Technical Specs

CPU TypeAMD B550
CPU Socket TypeAM4
Supported MemoryDDR4 1866, 2133, 2400, 2667, 2800, 2933, 3000, 3066, 3200, 3466, 3600, 3733, 3866, 4000, 4133, 4266, 4400 MHz
Non-ECC, ECC Unbuffered
Total Memory Slots4 x 288-Pin
PCI-e Slot(s)1 x PCIe 4.0 x16
1 x PCIe 3.0 x16
2 x PCIe 3.0 x1
PCI Slot(s)0
Display Port1
USB 2 x USB 2.0 Type-A
USB 3.00
USB 3.12 x USB 3.1 / USB 3.2 Gen 1 Type-A
USB 3.21 x USB 3.1 / USB 3.2 Gen 2 Type-A
USB-C1 x USB 3.1 / USB 3.2 Gen 2 Type-C
LAN1x 10/100/1000Mbps
M.21 x M Key 2242, 2260, 2280, 22110 (PCIe 4.0 x4, PCIe 3.0 x4)
1 x M Key 2242, 2260, 2280 (PCIe 3.0 x4)
Wireless LANNone
RGB1 x 4-pin RGB LED connector
2 x 3-pin RAINBOW LED connectors

No Hassle Return Policy & PC Certified Guarantee

Rest assured, if you order the wrong items, don't like the model, or just don't need it anymore we accept returns with NO restocking fees. Whether you want something different or just a credit, we have you covered! This policy goes hand in hand with our company culture of delivering outstanding customer satisfaction.

If you need assistance finding a different product our awesome staff is ready to help. Contact us for expert support.

  • Item(s) must be returned within 30 days from invoice date.
  • Item(s) must be received in original condition preferably in the same packing materials.
  • Item(s) should be securely packed for safe return.
  • The purchaser is responsible for all shipping costs and insurance.


  • Products usually ship within two business days after payment. If you have a rush order, or need an item delivered on Saturday please call to request faster shipping.
  • All products are shipped and delivered on business days.
  • Fixed or free shipping offer does not apply to items shipped on pallets, please call for rates on those items. Free shipping offers only apply to the continental US.


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