What is E-Key?

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What is E-Key and what goes in it? The question should be self explanatory I'm buying a Z170 motherboard that has 2-E SSD :)

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 SSD is fully compatible with your motherboard whether it's old or new and how to make

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