Best graphics card for 2010 Mac Pro that is supported out of box

[jladao]

Hello,

After reading through the netkas forums, I was able to create a ROM and flash the BIOS of my Sapphire r9 280 Dual-X OC card. I'm now able to see the boot screen on my Mac Pro 1,1 (2,1) on DVI ports 1 and 2, but now all other ports on the GPU do not function.

The following info are the ports on the GPU as well as any relevant info I can think of:

• DVI-1
  Before GPU Flash:
  Port worked, but did not show boot screen.
  After GPU Flash:
  Port works with boot screen.
• DVI-2
  Before GPU Flash:
  Port worked, but did not show boot screen.
  After GPU Flash:
  Port works with boot screen.
• HDMI
  Before GPU Flash:
  N/A - Did not test.
  After GPU Flash:
  Port does not work, black screen.
• Display Port
  Before GPU Flash:
  Port worked when booting into Windows 10.
  Port did not work when booting into El Capitan. Black screen.
  After GPU Flash:
  Port not working when booting into both Windows 10 and El Capitan. Black screen.

Other info about this card:

• Dual BIOS
  Card was flashed with the BIOS switch on the "OFF" state

I've been looking through forums.netkas.org to find any clues, mainly under the Netkas Port Mapping Topic. Unfortunately, I'm still clueless as to how to fix the issue.

Ideally, I would like all ports on this GPU working, but all I really want is for the Display Port to work. I could care less about other ports.

Can anyone point me in the right direction? Attached is the original BIOS for this card. Any help is greatly appreciated. Thanks for reading