I'm having the same issue listed by the others.
I tried installing an EVGA GTX 780 SC onto my DX58SO2 motherboard. The system booted, but displayed the "0_" on a black screen in the lower right hand corner of my monitor. I have the latest bios[SOX5820J.86A] installed. Is there a bios update in the works? I'd rather not buy a new motherboard an processor to use this card.
I'd like to add that the system is booting into windows. I can tell based on the display on my Logitech G510 keyboard. I'll see the keyboard loading profiles, which only occurs after booting into the OS.