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Go to your boot options in BIOS and Enable above 4G decoding.

hi, thanks for your reply!

I've done it.
No difference.
BUT ONCE I was able to boot...BUT in MacOS the PC was working and non working.
Basically stuck interface for 10sec then pointer moving for 10sec...

I'm able to boot but the machine is zombie. mouse pointer works and doesn't.
 

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hi, thanks for your reply!

I've done it.
No difference.
BUT ONCE I was able to boot...BUT in MacOS the PC was working and non working.
Basically stuck interface for 10sec then pointer moving for 10sec...

I'm able to boot but the machine is zombie. mouse pointer works and doesn't.
Which version of Clover are you using? Z390 boards don't have native NVRAM support so you HAVE to install Clover with emulated ram AND RC scripts.
 
Well prior to installing the thunderbolt card I had everything working.
I had to use ONLY this driver: OsxAptioFix2Drv-free2000.efi
Meaning NO EmuvariableUefi and NO AptioMemoryFix.
This is on Gigabyte Z390.
Sleep is fine all is fine.

Now I made it work BUT I had to reset bios and start over a few times.
It's like if I modified Bios in a certain way the system didn't work if I did in another way then now it's booting and Hot Plug works OOB, NO SSDT or anything.

Above 4G Decoding is On and CSM Support too.
Then the usual Thunderbolt 3 settings.
Let's see if it continues to work.
 
Well prior to installing the thunderbolt card I had everything working.
I had to use ONLY this driver: OsxAptioFix2Drv-free2000.efi
Meaning NO EmuvariableUefi and NO AptioMemoryFix.
This is on Gigabyte Z390.
Sleep is fine all is fine.

Now I made it work BUT I had to reset bios and start over a few times.
It's like if I modified Bios in a certain way the system didn't work if I did in another way then now it's booting and Hot Plug works OOB, NO SSDT or anything.

Above 4G Decoding is On and CSM Support too.
Then the usual Thunderbolt 3 settings.
Let's see if it continues to work.
Z390 systems will have to rely on emulated ram, which means that your clover installation needs to be the last item in this list - @pastrychef please correct me if I'm wrong.


Also, one of the things I had to do was to go to your BIOS>BOOT>Secure Boot and one by one delete all of the secure boot keys. I have an ASUS board so your process might be different.

To me your problem looks like your devices are fighting for memory space. Try what I mentioned above first, and if that doesn't work, remove all of your PCI devices except your GPU. If boots successfully, add TH3 card, and so on.
 
Thanks! I was able to boot.
I had to reset Bios a few times and modify it step by step.
Enabling Above 4G Decoding and leaving CSM Support switched on.

Now it seems to work.
My Secure Boot has been disabled since the beginning, contrary to Asus boards. I can't delete any key.

Correcting the previos Bios didn't work I had to reset it and start over.
 
Thanks! I was able to boot.
I had to reset Bios a few times and modify it step by step.
Enabling Above 4G Decoding and leaving CSM Support switched on.

Now it seems to work.
My Secure Boot has been disabled since the beginning, contrary to Asus boards. I can't delete any key.

Correcting the previos Bios didn't work I had to reset it and start over.
Yes I had the same exact problem and eventually I discovered that secure boot keys were being repopulated.i could not trace to the exact step that was happening (my guess after I would load optimized defaults but not sure).
 
Great. I'll try it on my Durex X299.
 
Yes I had the same exact problem and eventually I discovered that secure boot keys were being repopulated.i could not trace to the exact step that was happening (my guess after I would load optimised defaults but not sure).

This motherboard "Gigabyte Z390 Gaming X) has issues with MacOS
Once you add the Thunderbolt 3 card it tends not to boot.
I was able to make it boot by re doing the Bios from scratch but then all of the weirdest thing happen to make it unstable. It looses the Bios settings like the battery was unplugged.

Have to switch.
 
This motherboard "Gigabyte Z390 Gaming X) has issues with MacOS
Once you add the Thunderbolt 3 card it tends not to boot.
I was able to make it boot by re doing the Bios from scratch but then all of the weirdest thing happen to make it unstable. It looses the Bios settings like the battery was unplugged.

Have to switch.
What BIOS are you using? The latest released by Gigabyte is a beta version and does not work with MacOS.
 
I've switched back to F5 BUT I still have issues.
It seems at least the BIOS is not resetting by itself when I switch off the PSU.
But even with the F5 Bios and the Thunderbolt card (plugged in the only slot where a 4x card can be plugged) things are not working properly.
For example last reboot the machine went into a loop of reboots. I have to reset bios, then load the values, then reboot or remove the thunderbolt card. Once removed the thunderbolt card the system booted up immediately (same untouched EFI).
A remainder without the Thunderbolt card the system runs really well. Everything working. Sleep/Wake, reboot, speed (2200 Cinebench).
 
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