Issue booting with Gigabyte Radeon HD7950

Hello,

I have a DX79SI which has worked perfectly thus far with my Zotac GTX 570.  I got a Gigabyte 7950 and after I physically installed it, I can get past the initial BIOS boot but can't get to the Windows load screen.  I do get an error at the bottom right hand part of the screen which is 0_  .  Is there a possibly known issue/fix for the DX79SI and HD 7950?

I have updated the DX79SI to version 0559, downloaded and installed the most current Gigabyte drivers for the HD 7950 and still won't boot.

My system:

Windows 7 64-bit Professiona950l

Intel DX79SI system board

Intel i7-3930K Proc

32GB of RAM

750W power supply

Zotac GTX 570 (works)

Gigabyte Radeon HD 7950 (want to work)