Adding a second M.2 drive can change the bandwidth available to another slot. The exact effect belongs to the motherboard’s slot map, not to the SSD label.
Start with slot IDs
Write down the actual slot IDs printed in the board manual. The MSI MAG B650 TOMAHAWK WIFI lists M2_1, M2_2 and M2_3, with distinct supported lengths. Do not assume all three behave alike.
Read the resource-sharing note
MSI says M2_3 and PCI_E2 share bandwidth. When devices occupy both, each runs at x2. This is a speed and resource condition, not a claim that either device is physically incompatible.
Check the CPU too
MSI also states that M2_2 is unavailable with Ryzen 8500/8300 series processors. A slot check must therefore include the selected CPU family. For a different board, repeat this process using its own manual.
Make a slot allocation table before installation
List every drive and expansion card, then assign each to a physical connector named in the motherboard manual. For the MSI MAG B650 TOMAHAWK WIFI, read the M2_3 and PCI_E2 sharing note together rather than reading each entry alone. If both are occupied, the manufacturer’s stated lane allocation governs the expected bandwidth; the SSD’s box speed is not a system guarantee.
- Record the CPU model because M2_2 availability varies for certain Ryzen 8500/8300 processors.
- Record whether PCI_E2 is occupied before evaluating M2_3.
- Check each drive length and any board cover clearance separately.
Do not transfer a lane rule across models
An ASUS or another MSI board with the same chipset can route storage lanes differently. The exact board model, CPU and occupancy determine which sharing note applies. When the manual is unclear, use the manufacturer support channel instead of assuming an unused connector is fully enabled.
Sources & verification
Manufacturer pages were checked on 2026-10-29. Recheck the current page before purchase.
- MSI MAG B650 TOMAHAWK WIFI specifications Checked 2026-10-29
Found an error? Request a correction.