Alienware 17 R3 M.2 Interface ??? Is this right

Recently install Samsung SSD 970 EVO 250GB M.2 2nd Slot Alienware 17 R3

Slot 1 Interface PCIe 3X4
Slot 2 Interface PCIe 3X2 ?

Is this right?

 

My m15R1 has this as well. Oddly, my 970 Evo underperformed in the one slot and worked fine in the other, meanwhile the Toshiba performed normal in both. I forget why specifically, but there was text next to the slot that made me go "oh that makes sense". I think its cuz one of them says like "Optane" or "SATA" and the other doesn't.

Looking at the m15 specification pdf it says this:
One M.2 2230/2280 solid-state drive SATA AHCI 6 Gbps/PCIex4 NVMe Up to 1 TB One M.2 2280 Intel Optane storage PCIex4 NVMe up to 32 Gbps Up to 118 GB

I know yours is 17 R3, but maybe its something similar.

 

Its not too bad one just has half the read then the other one as you can see in the bench

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