Hope I can help a bit.
My system is different and by updating from cuda drivers 9.0 (nvidia drivers < 387.92) to cuda 9.10, my system cannot install some of my GPU.
My issue is due to vbios modified on some GPUs. Revert back to original Vbios make all GPU work with cuda 9.1 drivers.
In my investigation, with many drivers tests, I found that some clean install don't have cuda installed !
Test with clean install of 391.35 --> no GPU on octane render (but ok for game and all ok in device manager.
I noticed that also for 391.24.
So I test the 387.92 (the first one with cuda 9.10), and that works. And I think from there, you can update to new drivers (without a clean install).
To do a clean install, you should use DDU.
For me, as Octane 3.08 works with 387.92, I'm still with it, until the next mandatory drivers.
Thanks, itou31. I made sure that I was back to my default settings in the BIOS, like you suggested and that may have helped, but the graphic below shows what I have to go through whenever a display driver crashes. This has happened in the past and I could never figure out what I did to get it going again, but this time I figured it out. If I do not follow this procedure, anything can happen, like my Titan X showing up as my GTX 560 in Device Manager, or simply not even being recognized at all by Windows as even existing! All told, down 10 hours overall. But FINALLY, Octane 3.07-.08 see my GPUs now.
Everyone strongly suggests DDU, so I will have to try that next time, too!
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Win7 | Geforce TitanX w/ 12Gb | Geforce GTX-560 w/ 2Gb | 6-Core 3.5GHz | 32Gb | Cinema4D w RipTide Importer and OctaneExporter Plugs.