MSI B550-A PRO ProSeries Motherboard (AMD Ryzen 5000, AM4, DDR4, PCIe 4.0, SATA 6Gb/s, M.2, USB 3.2 Gen 2, HDMI/DP, ATX)

MSI is the most trusted name in gaming and eSports. We’ve dedicated countless hours and committed numerous resources to support the world’s most aspiring and best gamers and use their knowledge and expertise in our products in return. MSI integrated all gamer’s aspirational functions in its gaming rigs and pushing the performance beyond limits.
B550-A PRO Advancing Ascension
Powered by AMD Ryzen AM4 processors, the MSI B550-A PRO combines stable functionality and high-quality assembly to solve professional workflows. Extended Heatsink Design and Core boost keep critical components operating reliably. PCIe 4.0 slots and M.2 with Shield Frozr provides the latest in device connectivity.
Support for 3rd Gen AMD Ryzen processors and future AMD Ryzen processors with BIOS update
Supports dual channel DDR4 memory up to 128 GB (4400 MHz)
Lightning Fast Game experience: PCIe 4.0, Lightning Gen 4 M.2 with M.2 Shield Frozr, AMD Turbo USB 3.2 GEN 2
Core Boost technology combines optimized power circuit layouts and digital power regulation which allows for precise and steady current delivery to the CPU
AUDIO BOOST rewards your ears with studio grade sound quality for immersive gaming experiences
Premium Thermal Solution: Heatsink thermal pad rated for 7W/mk and PCB with 2oz thickened copper
Flash BIOS Button lets users flash the BIOS even without a CPU or memory
LIGHTNING GEN 4 SOLUTION
Strike fast with MSI Lightning Gen 4 PCI-E. Attach ultra fast PCI-E 4.0 devices and enjoy up to 64GB/s unidirectional transfer bandwidth.
EXTENDED HEATSINK
An all-metal extended heatsink enlarges the heat dissipation surface allowing the CPU power system to reliably drive even high-end processors.
CORE BOOST
Core Boost combines a reserved zone of optimized circuits and premium power delivery components to create a highly efficient power system capable of precise current output to the CPU.
PCB WITH 2OZ THICKENED COPPER
An enhanced PCB material design with 2oz thickened copper increases conductivity, improving heat dissipation and high-performance reliability.
EASY TO ARRANGE YOUR CABLES
Tuck away SATA and USB cables neatly with MSI Atypical PCB edge.
FORTIFY WITH PCI-E STEEL ARMOR
MSI PCI Express Steel Armor slots are secured to the motherboard with extra solder points and support the weight of heavy graphics cards. When every advantage in games counts, Steel Armor shields the point of contact from electromagnetic interference.
MAG B550 TOMAHAWK
MAG B550M MORTAR WIFI
MAG B550M MORTAR
MAG B550M BAZOOKA
B550-A PRO
B550M PRO-VDH WIFI
Add to Cart </form>
See Details
See Details
Add to Cart </form>
Add to Cart </form>
Add to Cart </form>
Customer Reviews
4.7 out of 5 stars
5,380
4.4 out of 5 stars
470
4.5 out of 5 stars
436
4.4 out of 5 stars
399
4.6 out of 5 stars
3,027
4.5 out of 5 stars
3,889
Price $139.99$139.99
—
— $82.11$82.11$109.99$109.99$99.99$99.99
CPU Support Support for 3rd Gen AMD Ryzen processors and future AMD Ryzen processors with BIOS update Support for 3rd Gen AMD Ryzen processors and future AMD Ryzen processors with BIOS update Support for 3rd Gen AMD Ryzen processors and future AMD Ryzen processors with BIOS update Support for 3rd Gen AMD Ryzen processors and future AMD Ryzen processors with BIOS update Support for 3rd Gen AMD Ryzen processors and future AMD Ryzen processors with BIOS update Support for 3rd Gen AMD Ryzen processors and future AMD Ryzen processors with BIOS update
Chipset / Socket AMD B550 / AM4 AMD B550 / AM4 AMD B550 / AM4 AMD B550 / AM4 AMD B550 / AM4 AMD B550 / AM4
DDR4 Memory Support 4 x DIMM; Max. 128GB DDR4; 4866+ MHz 4 x DIMM; Max. 128GB DDR4; 4400+ MHz 4 x DIMM; Max. 128GB DDR4; 4400+ MHz 4 x DIMM; Max. 128GB DDR4; 4400+ MHz 4 x DIMM; Max. 128GB DDR4; 4400+ MHz 4 x DIMM; Max. 128GB DDR4; 4400+ MHz
PCIe x16 Slots 1x PCIe 4.0 x16 slots (x16); 1x PCIe 3.0 x16 slots (x4); 2x PCIe 3.0 x1 slots 1x PCIe 4.0 x16 slots (x16); 1x PCIe 3.0 x16 slots (x4); 2x PCIe 3.0 x1 slots 1x PCIe 4.0 x16 slots (x16); 1x PCIe 3.0 x16 slots (x4); 2x PCIe 3.0 x1 slots 1x PCIe 4.0 x16 slots (x16); 2x PCIe 3.0 x1 slots 1x PCIe 4.0 x16 slot (x16 / x4); 1x PCIe 3.0 x16 slot (x4); 2x PCIe 3.0 x1 slots 1x PCIe 4.0 x16 slots (x16); 2x PCIe 3.0 x1 slots
Display Output HDMI, DisplayPort (requires processor graphics) HDMI, DisplayPort (requires processor graphics) HDMI, DisplayPort (requires processor graphics) HDMI, DisplayPort (requires processor graphics) HDMI, DisplayPort (requires processor graphics) HDMI, DisplayPort, VGA (requires processor graphics)
M.2 2x M.2 2x M.2 2x M.2 2x M.2 2x M.2 2x M.2
Wireless n/a 2x2 Wi-Fi with MU-MIMO 802.11 a/b/g/n/ac/ax n/a n/a n/a 1x1 Wi-Fi 802.11 a/b/g/n/ac
Ethernet LAN 2.5G LAN & Gigabit LAN 2.5G LAN 2.5G LAN Gigabit LAN Gigabit LAN Gigabit LAN
Mystic Light 16.8 million colors n/a n/a n/a n/a n/a
Form Factor ATX Micro-ATX Micro-ATX Micro-ATX ATX Micro-ATX
Powered by AMD Ryzen AM4 processors, the MSI B550-A PRO combines stable functionality and high-quality assembly to solve professional workflows. Extended Heatsink Design and Core boost keep critical components operating reliably. PCIe 4.0 slots and M.2 with Shield Frozr provides the latest in device connectivity.