Asus Z170 Pro Gaming adding a PCI express sata card - performance

[kefegg]

Hi,

I recently updated my system. Used to run an I5 2500K on an Asus P8P67 deluxe board. Now I run an I5 6600K on an Asus Z170 Pro gaming board.
Everything seems fine, stable and cool except the missing of 2 extra sata ports.

I know I had to overthink before buying a new board but forgot the quantity on Harddrives running on my system.
So I would like to add a Pci Express Sata 600 controller. (UPC code: 065030838955)
But before buying one, I have some questions about the performance.

-Would adding such card have some kind of influence on the overall performance of the system?
-Would it have influence on the performance of my GTX 970 GPU?
-It would have to run RAID 1 (mirror), would it do fine or better rely on the raid option coming from Intel (Through the BIOS of the Z170 board itself)
-Anyone has got one of these in his system and has got some more feedback on this, it would be welcome.

thanks

 

[Burpo]

It gives you extra sata ports, but that card is pretty much junk, and slower than your onboard sata controler.

 

[kefegg]

It gives you extra sata ports, but that card is pretty much junk, and slower than your onboard sata controler.

Late reply:
It was only needed as raid controller for 2 backup hdd's. They work perfect now and I don't see any issues with my GPU.

 

[nerp]

Do you have an m.2 slot? Have you considered installing an M.2 drive as the OS/system drive thus freeing up a SATA port?

 

[kefegg]

Do you have an m.2 slot? Have you considered installing an M.2 drive as the OS/system drive thus freeing up a SATA port?

Yep,

there is one M2 connector.
Was thinking about the same but performance wise, would it be an upgrade or just a small hole in my budget?