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Re: I have an Alienware 17 R4. Does it have Pcie interface to use the newest generation pcie ssd's???

Yes, I also have a 17 R4 and am using the below Samsung 960 NVMe stick.  It is running at PCIe Gen3 x4. Samsung 960 EVO Series - 250GB PCIe NVMe - M.2 Internal SSD (MZ-V6E250BW): Computers & A... 

I believe both M.2 sockets support PCIe actually, but I can't remember which one I used