Dual GTX 1080 and High Sierra issue

[sebtech]

Hi !

I really need help to understand what is going wrong with my setup.

During 2 years I was on macOS Sierra and everything was fine, I use this workstation to work everyday, but I had to update to High Sierra due a software update. Of course I did a fresh install for macOS High Sierra (based on the great guide from KGP). Everything was fine until I reached the step of Nvidia web drivers.

I am able to boot correctly when only one card is plugged. When I put the two cards, macOS won't boot or boot after 10 min !
Most of the time I got black screen but, I can't access through VNC. Sometimes I got desktop but system is very unstable and some informations are missing (see attached files).
I already tried different things with clover options but without success.

To resume, the same build, with 10.12 worked perfectly, now with 10.13.6 I can only boot with one card.

Anyone got an idea to start digging ?

Configuration:

- Asus Sabertooth X99 (up to date, patched MSR unlocked)
- i7 6950X
- 2X MSI GTX 1080
- 64GB DDR4
- NVME 970 (macOS drive - APFS)

Please find my EFI Folder.

 

[blouse]

Same. If you find a solution please share- there seem to be a few more of us looking for a fix.

 

[sebtech]

I found the solution for me.
It was into the bios. I have to disable the settings called "4G Decoding" for boot process.

Hope it will works for you.

 

[blouse]

Unfortunately I already had that disabled. I've been taking a look at your EFI file from earlier, but no luck from that either.

Thanks for sharing.

 

[hoypolloy]

I found the solution for me.
It was into the bios. I have to disable the settings called "4G Decoding" for boot process.

Hope it will works for you.

hey mate. do you still use your x99 with dual nVidia? I can't get mine working, tried everything