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Motherboard · MSI

MSI B550-A Pro

Current productReleased 2020Model B550-A Pro

MSI B550-A Pro is a ATX board for AM4 processors on the B550 chipset. It takes up to 128 GB of DDR4 memory across 4 slots, provides 2 M.2 slots up to PCIe 4.0 and 6 SATA ports, and scores 35 for platform longevity on the Rigwise preview scale.

Best for

  • Cost-controlled builds that will be replaced whole rather than upgraded
  • 2 M.2 slots for storage expansion without adapters

Main trade-offs

  • PCIe 5.0 drives run at PCIe 4.0 speeds in these M.2 slots
  • No onboard Wi-Fi

Lowest sample total

$116

Sample data

Across 2 demo retailer offers including shipping. 2.5% below the sample-window median.

Offers
2

2 in stock

Updated
Aug 12, 2026

Data version lquy6dkw0qq7

Build a PC around this partCompare with Gigabyte B760M DS3H AX

Retailer offers

Retailer offers

Ranked by delivered total, stock and data freshness. Commission never affects this order.

Sample data
Sample data — illustrative fixture prices from a demo feed, not live retailer quotes.
RetailerPriceShippingTotalAvailabilityOpen retailer
Nordic PartsBest totalAffiliate partnerSample feed30-day returns · observed 4 d ago$115.99Free$115.99In stockGo to store
BitForge SupplyAffiliate partnerSample feed14-day returns · observed 4 d ago$115.99$4.99$120.98In stockGo to store

Sample data — illustrative fixture prices from a demo feed, not live retailer quotes. We are not the seller and take no payment. How offers are verified.

Price history

Lowest observed sample total per observation date, 9 points.

Sample data
Lowest
$114
Highest
$128
Median
$119
Current best
$116

Dashed line marks the median of the sample window. All values are illustrative fixture data.

Normalized specifications

Canonical values after unit normalization. Fields used by the compatibility engine are marked.

Socketcompat
AM4
Chipsetcompat
B550
Form factorcompat
ATX
Memory generationcompat
DDR4
Memory slots
4
Maximum memorycompat
128 GB
Maximum memory speed
4400 MT/s
M.2 slotscompat
2
M.2 max PCIe generation
4
SATA portscompat
6
Primary PCIe slot generation
4
VRM tier
Standard
Wi-Fi
No
Platform longevity index (demo scale 0–100)
35
Launch year
2020

Compatibility

Every pairing below was evaluated by the same rule engine the builder uses.

  • CPU

    2 of 20 compatible

    Works with AMD Ryzen 5 5600, AMD Ryzen 7 5700X3D.

    AMD Ryzen 5 7600 uses socket AM5 but MSI B550-A Pro provides socket AM4.

    AMD Ryzen 5 7600X uses socket AM5 but MSI B550-A Pro provides socket AM4.

    AMD Ryzen 5 9600X uses socket AM5 but MSI B550-A Pro provides socket AM4.

  • Memory

    5 of 20 compatible

    Works with Corsair Vengeance LPX 16GB (2x8GB) DDR4-3200 CL16, Corsair Vengeance LPX 32GB (2x16GB) DDR4-3600 CL18, G.Skill Ripjaws V 32GB (2x16GB) DDR4-3600 CL16 and 2 more.

    Corsair Vengeance 32GB (2x16GB) DDR5-6000 CL30 is DDR5 but MSI B550-A Pro accepts DDR4 only.

    Corsair Vengeance 64GB (2x32GB) DDR5-6000 CL30 is DDR5 but MSI B550-A Pro accepts DDR4 only.

    Corsair Vengeance RGB 32GB (2x16GB) DDR5-6000 CL30 is DDR5 but MSI B550-A Pro accepts DDR4 only.

  • Case

    18 of 20 compatible

    Works with Corsair 4000D Airflow, Corsair 5000D Airflow, Fractal Design Define 7 and 15 more.

    ASUS Prime AP201 accepts microATX, Mini-ITX boards, not ATX.

    Cooler Master MasterBox NR200P accepts Mini-ITX boards, not ATX.

  • Storage

    20 of 20 compatible

    Works with Corsair MP700 PRO 2TB, Crucial MX500 2TB, Crucial P310 2TB and 17 more.

    Corsair MP700 PRO 2TB is a PCIe 5.0 drive in a PCIe 4.0 slot. It works, capped near 7 400 MB/s instead of 12400 MB/s.

    Crucial T705 2TB is a PCIe 5.0 drive in a PCIe 4.0 slot. It works, capped near 7 400 MB/s instead of 14500 MB/s.

    Samsung 9100 PRO 2TB is a PCIe 5.0 drive in a PCIe 4.0 slot. It works, capped near 7 400 MB/s instead of 14700 MB/s.

Provenance

Every canonical value carries the source it came from, when it was retrieved and how confident we are.

FieldSourceRetrievedConfidence
biosUpdateRequiredForCpusRigwise curated manufacturer catalogAug 12, 202698%
chipsetRigwise curated manufacturer catalogAug 12, 202695%
formFactorRigwise curated manufacturer catalogAug 12, 202695%
launchYearRigwise curated manufacturer catalogAug 12, 202695%
m2MaxPcieGenRigwise curated manufacturer catalogAug 12, 202695%
m2SlotsRigwise curated manufacturer catalogAug 12, 202695%
maxMemoryGbRigwise curated manufacturer catalogAug 12, 202695%
maxMemoryMtsRigwise curated manufacturer catalogAug 12, 202695%
memoryGenerationRigwise curated manufacturer catalogAug 12, 202695%
memorySlotsRigwise curated manufacturer catalogAug 12, 202695%
pcieSlotGenRigwise curated manufacturer catalogAug 12, 202695%
platformLongevityIndexRigwise curated manufacturer catalogAug 12, 202695%
sataPortsRigwise curated manufacturer catalogAug 12, 202695%
socketRigwise curated manufacturer catalogAug 12, 202695%
vrmTierRigwise curated manufacturer catalogAug 12, 202695%
wifiRigwise curated manufacturer catalogAug 12, 202695%

Catalog preview

MSI B550-A Pro is a real product identity with curated compatibility specifications. Sample prices, availability, performance values and acoustic indexes are included to exercise the decision system and are not live or measured evidence.