M.2 & PCI-E Lanes

[anchit02]

Hey all,
I'm a bit confused on PCI-E lanes ans was hoping someone would educate me on the matter.
I'm current using the i7-4790k with the ASUS Z97-AR motherboard that has the following PCI-E configurations:

2 x PCIe 3.0/2.0 x16 (x16 or dual x8)
1 x PCIe 2.0 x16 (x2 mode)
2 x PCIe 2.0 x1 *1
2 x PCI

I'm using only 1 GPU (GTX 980Ti) on the PCI 3 port and no other PCI cards are connected. If I add an M.2 NVME SSD, will i get any real performance boost in storage or are my PCI Lanes from the CPU and motherboard already exhausted.

Was thinking of getting the WD Blue 3D NAND M.2 drive to use as my boot drive. Currently using a 6Gb SATA III connection for my SSD boot drive.

 

[USAFRet]

This drive?
https://www.newegg.com/Product/Product.aspx?Item=N82E16820250092

That is a regular SATA III drive, in a different package. You get exactly the same performance from a regular SATA III 2.5" drive.

 

[rgd1101]

and this mobo?
https://www.asus.com/us/Motherboards/Z97AR/specifications/

only support pcie m.2

 

[anchit02]

Sorry guys, I meant the WD Black NVMe (https://www.wdc.com/en-um/products/internal-ssd/wd-black-nvme-ssd.html)
On WD Site it says, it uses PCIe Gen3 8 Gb/s, up to 4 lanes

So, my question is, can I add WD Black M.2 on the Asus Z97AR mobo without getting the GPU down to X8 from 16X at present?
Also, will there be any realistic improvement on using the WD Black M.2 SSD as a boot drive over the current SATA III 6Gb/s regular SSD?

Using a i7-4790k with a GTX980Ti. Looking forward to your help.