MSI MEG B550 UNIFY - M.2 Slot Configurations

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

The M2_2 and M2_3 slots can be used under two PCIe bandwidth modes: 
mode (default) and  (by BIOS selection). In these two modes, they provide
different PCIe bandwidth for M2_2 and M2_3 slots, please refer the table below for
details.
Slot  
PCI_E1 @ 4.0/ 3.0 x16* @ 4.0/ 3.0 x8*
PCI_E2 — 3.0 x1 3.0 x1
PCI_E3 — 3.0 x1 3.0 x1
PCI_E4 — @ 3.0 x4 — @ 3.0 x4
M2_1 4.0/ 3.0 x4* 4.0/ 3.0 x4*
M2_2 3.0 x2 Empty 4.0/ 3.0 x4*
M2_3 3.0 x2** 4.0/ 3.0 x4*
/
**
M2_4 3.0 x4 Empty 3.0 x4 Empty

* PCIe/ M.2 specifications may vary depending on the CPU installed.
** The SATA5 and SATA6 ports will be unavailable when installing M.2SSD into
M2_3. The SATA5 port will be unavailable when installing M.2SSD into M2_3.

Important
 Enabling , please go to 
and set it to . In , the PCI_E1,
M2_2 and M2_3 slots share the same PCIe bandwidth.
 In  with 

series processors (not compatible with
AMD Ryzen
TM
5 3400G & Ryzen
TM
3 3200G) , if you install the MSI M.2 Xpander series

 In  with 

4000-G series processors, if you install the MSI M.2

available.