According to official data, MSI B450m mortar provides two M.2 interfaces, one of which is directly connected to CPU under the motherboard, which supports PCIE3.0 protocol *4, with high bandwidth and transmission rate of 4 GB/s. ..
The other M.2 interface located under the PCIE slot is connected to the B450 chipset, which means that it is connected to the motherboard South Bridge chip, not directly connected to the CPU. Only PCIE2.0*4 is supported. Provide 20Gbps transmission bandwidth, that is, 2GB/s transmission speed.
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NVMe protocol solid state drive.
NVMe is a logical device interface standard, which is the specification of solid-state hard disk using PCI-E channel. From the beginning of design, NVMe has made full use of the low latency and parallelism of PCI-E SSD, as well as the parallelism of contemporary processors, platforms and applications.
If the subject wants to install a solid-state hard disk with NVMe protocol, it can be seen whether the SSD is PCIE*4 or PCIE*2, and the performance of the SSD of PCIE*4 will be degraded when it is placed in PCIE2.0*4.
Detailed product specifications of MSI -B450m mortar