CrazyNutz, thanks for all your work on this! I gave 0.5.5 a try thinking that my Asus GTX680-DC2-4GD5 would take it. While I get no errors in the process, I get a Code 43 whenever I restart with the modified BIOS. I've done a bit of searching and I'm pretty sure I'm the only one to have this happen.

Throwing you a copy of my BIOS, in case it's a problem anybody runs into in the future: http://db.tt/y6qYSdiC