I don't think that the web drivers are applicable to the GTX 760 - Do a little research on the NVIDIA site.
If you can't use them, don't install them.
Good Luck
Yeah, as far as I can tell there are no web drivers for this particular device... but I kept seeing references to "web drivers" on another thread about the GTX760 so I didn't know if maybe there were some being used.
OK so because I blindly tried way too many things and couldn't properly control for what was making a difference anymore, I did another fresh install.
(Interesting side note, installing OSX failed as long as I had a Blu-ray drive connected, but succeeded when I disconnected it.)
This time I set system profile to iMac 13,1 and installed CUDA, and didn't really mess with much else. Interestingly, I need to use the PCIRootUID fix now, which I didn't before (??)
I've gotten two issues so far -- one total freeze before I updated CUDA to the latest version, and an application craft (Minecraft is my go to way to stress the GPU at the moment) after. The interesting thing is the dmesg readout is a little different now than it consistently was before: It's still a NVDA(OpenGL) Channel Exception error, but is now saying "Graphics Engine Error (GR Error 5).
I'm taking a break for now to do some work that I actually get paid for, but I'll evaluate and update how things are going. It seems to at least be SOMEWHAT more stable than before.
However, at what point do I give up and swap hardware? Would the GPU be a good guess to replace? Or is this considered a relatively minor issue that Hackintosh users need to expect to live with?
Thanks for all your help, P1LGRIM. Really appreciated.
