Hi Dougx.
Have you received the modded BIOS from Klem with the correct Option ROM or Hybrid ROM with the GOP driver, or whatever mod Klem has made?
I'm in the same journey but on an ASUS G73SW laptop. I'm currently in the investigation phase, where I'm stuck with the idea that probably I will need to mod my BIOS adding the legacy vbios of GTX 780m along with a GOP section inside CSMCORE module.
Still investigating if that's the correct path, since there are several sizes of vbios for GTX 780m and I'm going with the DELL vbios (my GTX 780m card was manufactured by DELL). That vbios sizes around 162KB, I think it's not the correct size to put into CSMCORE module (as an EFI rom). In contrary, the Alienware vbios sizes around 89KB and that's one I can add into CSMCORE module (as an EFI rom).
If case the answer is yes, can you share the modded BIOS?
Thanks in advance.