Can M.2 pcie ssds be used on a R820 ?

I'm looking to place qty 2 (two)  M.2 PCIE SSDs into an R820 .

Do the R820s have M2 slots ?

I made several calls to Dell sales and got no where.

Can the Samsung 960 PRO 512G, which has an M2 interface, plug into the dell R820 ?

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