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dell precision 7520 m.2 issue

I have three drives:

samsung 850 evo m.2

samsung 860 evo m.2 500gb nvme

samsung 960 evo m.2 500gb nvme

The issue is all of our dell 7520 will only see the samsung 960 evo m.2 500gb nvme in the BIOS. If we put in one of the other drives the system will not see it in the BIOS.

Does anyone know why the system would see only 960, but not the other two. 

The other thing i saw is the 850 and the 860 NVME run on 3.3v 1.7A and the 960 NVME runs on 3.3v 2.7a. Would this make a differences or something else?

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