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Yes that is correct. F1 restart. OSX Restart, and Windows restart. If the eGPU is plugged into the Mac I get a black screen. The only time it boots with the eGPU plugged in is from a clean/cold shutdown. I have tried it both ways. OSX recognizes the eGPU if I plug it in immediately after I hear the apple boot up sound. But the EFI app never seems to detects the eGPU, even from a cold boot. EFI app doesn't detect it with the quick plugin trick either.

Yep, it won't boot back into the eGPU EFI disk once I have selected Load GOP drivers. The VBIOS version installed says its UEFI compatible, based on the techpowerup site.. The 2015 13" MBP (On the latest El Capitan) refuses to warm boot with the thunderbolt eGPU cable plugged in. All I get is a black screen with no sound at all. It will boot up from a cold shutdown and I can select the eGPU boot disk, but it never sees the eGPU. Even if I try to quickly plug it in the moment I hear the boot sound its never able to detect the eGPU. However, when I plug it in right after a cold boot and let it boot into OSX, using your automate-eGPU script with the -a option, it finds the eGPU and is able to run CUDA applications as well as use an external monitor. So I CAN get it to work.

The images aren't showing up... What text file did you have to edit?

With Load GOP set to on, I press F1 and it reboots into macOSX, but nothing is recognized. This is without your script being installed and without the Nvidia drivers installed. I can see on the EGPU boot drive that an eGPU.efi file is created and a settings fie as well. Do I still need to have the Nvidia drivers installed even with the eGPU EFI? I get a black screen though, any time I try to boot back into the eGPU EFI. I have to delete the settings and eGPU.efi file to get it to come back up. I have a Nvidia brand card. It comes up as this device https://www.techpowerup.com/vgabios/165256/nvidia-gtx970-4096-140826 however the VBIOS and other specs actually match this one https://www.techpowerup.com/vgabios/183593/183593

@ssamydla I used the automate-eGPU installer script to download the latest Nvidia drivers. I also downloaded the and installed the latest CUDA drivers. My dGPU is an AMD Radeon R9 M295X 4096 MB Before I upgraded to macOS Sierra I was unable to get the same setup to recognize the card for CUDA applications then too.

@goalque So I finally had some time to test this out some more this past weekend. I am currently running macOS beta 2 so I understand I'm already pushing the limits of whats available at the moment. The results so far are this, I was able to get the correct ROM (eGPU.rom) file for my board and add it to the boot USB. When I select the drive to boot up, your EFI loader appears and recognizes the card and lets me set Load GOP drivers ON/OFF and changed the Switch screen option to either iGPU or eGPU. I am not able to view anything on an external monitor via the eGPU when I change these settings. But I believe since I have a dedicated graphics card already in my iMac the eGPU can only be used for CUDA functions correct? macOS will boot normally but will not recognize the eGPU at all, even after a few F1 restarts. However using your script I am able to get the macOS beta 2 (Nvidia has beta drivers for macOS Beta 2 367.05.10.05b07 already) to recognize the eGPU card fully and install the CUDA drivers. BUT I cannot get any CUDA applications (CUDA-Z, Resolve, etc) to recognize the eGPU at all. Tried with and without an external monitor plugged into the eGPU. When booting into Windows 10 I have to "time" the plugging in of the external eGPU to right before the login screen, otherwise I get a blue screen crash. If I time it correctly it works very well in Windows 10 and I am even able to drive my Oculus Rift just fine. Hardware: iMac (Retina 5K, 27-inch, Late 2014) Echo Express III-D with Nvidia GTX 970

So this disables eGPU output, but still lets me use the card for CUDA optimized applications? And fixes the internal display issue?

Ohhh, you are running an external 5k display! My mistake... the sleep trick may not work for you then. I have a late 2013 Mac Pro for work and briefly tried playing with the eGPU but ran into the same issues you are having.

Which iMac do you have? My late 2014 will let me keep the eGPU plugged in (for OS X only) from a cold boot and a warm restart. But my early 2015 Macbook 13" won't boot if I keep the eGPU plugged in during any bootup. I have to plug it in right after I see the Apple logo.

razvani, the same thing happens with my 5k mac... I found that if I just tell the Mac to sleep and wake it back up, it returns to the full resolution. I believe it has something to do with how Apple runs the 5k monitor, I think they basically split the display into two screens and only one gets turned on. But when waking up from sleep it turns them both on, giving you a full screen again. Actually upon checking again it actually doesn't go back to 5k, its 4k, but it at least brings it back to full screen instead of half. Also I am on the 10.12 beta 1 so that might be causing some different issues. I had to tweak the script by goalque to work with 10.12 and it does work, but I can't get any CUDA optimized apps to recognize the eGPU including CUDA-Z. Also things run a bit slow and choppy when both GPUs are running.

I was able to boot to the eGPU EFI but when I select GOP the screen flashes but doesn't switch output to the external monitor. I wasn't able to extract the VBOIS from my card and GPU-Z says it's not UEFI compatible (does that matter?) When I select lookup it takes me to an incorrect card that says it is UEFI compatible. I tried that ROM version since it's closer to what my card says. I will put the card in a PC and get the real ROM and try again.

Couldn't have come at a better time!! I was thinking about coming up with a way to just delay the initial boot up of the graphics card once the case senses power, but I much prefer your approach! I have the Sonnet Echo Express III with an Nvidia GTX970. Works with my 2014 5k iMac with OS X & Windows 10. Cant turn the system on with it plugged in though just have to wait a few seconds into boot up. Also I am struggling to get my setup to work with a 2015 13" Retina Macbook. OSX works fine (external output), but Windows 8.1 & 10 are proving to be a real struggle. And once again I have to plug the eGPU in after the apple/windows images. Your OSX script has been awesome! Thank you for that! If you need beta testers I'd be more than happy to help out, none of my machines are critical work devices. I am a software engineer so when troubleshooting I can speak your language. :-)