B550 Gaming Plus M.2 Slots Review: Performance Guide 2026

The ASUS ROG Strix B550 Gaming Plus motherboard's M.2 slots get an in-depth review for 2026 builders. With PCIe 4.0 support, these slots handle NVMe SSDs blazingly fast for gaming rigs.

This guide details configurations, compatibility, and optimization steps for peak performance in modern builds.

Step 1: Locating M.2 Slots on B550

Board features 2x M.2 slots: one PCIe 4.0 x4, one PCIe 3.0 x4. Check manual for CPU dependency.

  • Slot 1: Direct to CPU lanes
  • Slot 2: Chipset shared
  • Heatsinks included

Step 2: Compatible SSD Installation

Select Gen4 SSDs like Samsung 990 Pro. Secure with screw, apply thermal pad.

  • Align golden notch
  • BIOS flash for recognition
  • Max 2280/22110 sizes

Step 3: BIOS Configuration

Enter BIOS (Del key), enable PCIe 4.0 under Advanced > Storage.

  • Set M.2 mode to PCIe
  • Disable CSM for NVMe
  • Update to 2026 firmware

Step 4: Performance Testing

Use CrystalDiskMark. Expect 7000MB/s reads on primary slot.

  • Benchmark before/after
  • Monitor temps under load
  • RAID optional

Step 5: Troubleshooting Common Issues

No detection? Reseat and check PSU power.

  • Verify CPU compatibility
  • Clear CMOS if needed
  • Cable management

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