mainboard m 2 2 slot ✓ Which slot to use?

mainboard m 2 2 slot
I can't find a way to ID, in software, which SSD is which I want to install Windows 10 on the fastest slot, but I am unsure which to use mainboard m 2 2 slot I'm upgrading one of the 1TB drives to a 2TB I will use the MSI Expander on my Creator X299 motherboard to install the new drive so I can

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mainboard m 2 2 slot 2 Slot do I use Motherboard manual says following -For 3rd gen AMD Ryzen Processors, the _1 supports PCIe x4 and SATA modes M key design and type