MoboDocsSpecifications & model notes
- Form factor
- Micro ATX
- Memory slots
- 4
- M.2 storage slots
- 2
- SATA ports
- 6
Physical connector counts do not guarantee simultaneous use. Check processor and lane-sharing limits in the specification.
M2_2 supports PCIe 3.0 x2 or SATA storage and shares lanes with SATA3_5 and SATA3_6. Using either side disables the other. The separate Key E wireless socket is not an SSD slot.
Original documentation
Helpful starting points
Each guide states its scope. General checklists are not hardware tests of this particular model.
ASRock B550M Pro4: M2_2 or SATA 5/6 disappears
Understand M2_2 sharing with SATA3_5 and SATA3_6 on the B550M Pro4, including why the second M.2 slot has a lower PCIe link.
Connect your case’s front-panel cables
Identify the power switch, reset switch, and indicator LEDs using the correct header map.
Will an M.2 SSD disable another port?
Read slot-sharing notes before adding an SSD or expansion card.
How to find your motherboard model and revision
Read the board identity in Windows, then distinguish the product name, hardware revision and BIOS version.
Where to download motherboard drivers
Find chipset, network and audio drivers for the exact board and operating system, including a plan for a PC without internet.
Will this CPU work? Check the board and BIOS together
A matching socket is only the first check. Read the exact CPU support entry and required BIOS before replacing a processor.
Sources reviewed 2026-10-22 · Report a correction.