Upgraded mac pro 1,1 to 2,1 GPU ATI R9 270 problems

[cybert]

Hi,

Maybe someone here can help me.
I have a dual CPU 8 core Xeon mac pro. 16 GB mem.

I just bought the ATI R9 270 OC card edition from gigabyte.
I also bought the 2 special power cables that I needed (from main board to 6 pin power cable to power the card).

Installed my card, connected the power cables, but nothing,...
No screen, even after 5 min, nothing happens on my screen.

Anyone with some suggestions?

BTW, yes I installed a 64 bit boot loader, and I am running mavericks.

 

[666sheep]

You need to add device ID to drivers, exactly that same like was with 7850.

 

[cybert]

You need to add device ID to drivers, exactly that same like was with 7850.

Do you have a link to a how to for it?