Mac Pro & GTX660 Compliance

[kozmicblues]

Hi.
mac pro 4,1 (early 2009) I have a machine.
I'm using a 512 MB graphics card GT120.


card: GV-N660WF2-2GD (rev. 2.0)
http://www.gigabyte.com/products/product-page.aspx?pid=4868#ov


cable:PCIe PCI-e Power Cable for Mac G5 nVidia ATI Video Cable
http://www.amazon.com/pcıe-power-cable-nvidia-video/dp/b002ur1654


As I search the forums , I use cable with graphics cards on the link , it is said that I can use on my device .

Is it true ?

thank you.