Santa came early (and was dressed in brown with a brown sleigh...hmmm?) A GTX780 Ti and an R9 290X showed up. Sadly, neither one showed up with Mac desktop. I had been hoping that 780Ti would use same device id as original 780...it didn't. So as of 10.9, there are no drivers for either. So.... time to start looking for 10.9.1 and to see about inserting device id into drivers. Nvidia has hidden where they go, looks like i'll have to look. Hopefully 10.9.1 will enable one or the other. Or if Nvidia releases Web driver for 10.9, maybe? So, many of you had written with hope for EFI'd 780Ti. I'll write an EFI, but it will be a road to nowhere for time being.