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Adding new Mojave or Catalina boot on a separate SSD, while keeping existing dual boot of High Sierra and Windows 10

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Hi,

I could not find a guide on adding a new boot while keeping existing boots intact. Currently, I have a fully working dual boot of Windows 10 and High Sierra (because of not released NVIDIA drivers for my GPU) on separate SSDs. Now I would like to do some coding for iOS and need new version of XCode available on Mojave or Catalina.

Is it possible to buy a new SSD and create Mojave or Catalina boot on it without destroying two other boots? If so, how would I do it? I am aware that I would have to use processor graphics on that boot. Is reconnecting cable from GPU to motherboard only option that I have when switching from HS or Win to Mojave/Catalina?
 

Going Bald

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Simple procedure:
Shutdown.
Install new SSD.
Disconnect existing Sierra and Win10 drives.
Install Mojave or Catalina to new drive and get it booting on its own.
Shutdown.
Reconnect Sierra and Win10 drives.
Boot to UEFI and set the Mojave/Catalina drive as first in BBS boot order. Save&exit, continue boot
Select which OS you want to boot at the Clover screen.
 
Joined
Feb 22, 2019
Messages
10
Motherboard
Asus ROG Strix Z370-F Gaming
CPU
i7 8700K
Graphics
EVGA GeForce GTX 1080 TI SC2 Gaming ICX
Thank you, good sir, for a quick reply. I bought the SSD, followed the procedure and managed to install Catalina on a separate SSD with working UHD 630 graphics, plugged everything back in. Catalina works well, Windows works with both GPU and IGPU. I am having some trouble with High Sierra, i. e. I can not make it to boot with the same Clover config that works with Catalina.

If I do not boot from Catalina's EFI but from old High Sierra's, HS works great with my GPU, but if I boot from Catalina's drive, which I would like to do in the future, HS can't boot, and verbose mode does not give any useful info (at least I have not caught it) why it reboots.

I did a little digging, and figured that changing Devices/IntelGFX from 0x59168086 (which works with Catalina) to 0x0 (which worked before with HS) successfully boot HS with running GPU graphics, but then Catalina's UHD graphics does not work.

In all testing, when wanting to boot with (HS or Windows) GPU graphics, I connect monitor to GPU with DP, and when wanting using UHD graphics (Catalina), I connect monitor to motherboard's DP.

Do you maybe know if it is possible to use the same clover configuration with both HS with GPU graphics and Catalina with UHD 630 graphics (Windows works in all cases :D)?
 

Going Bald

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Joined
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Thank you, good sir, for a quick reply. I bought the SSD, followed the procedure and managed to install Catalina on a separate SSD with working UHD 630 graphics, plugged everything back in. Catalina works well, Windows works with both GPU and IGPU. I am having some trouble with High Sierra, i. e. I can not make it to boot with the same Clover config that works with Catalina.

If I do not boot from Catalina's EFI but from old High Sierra's, HS works great with my GPU, but if I boot from Catalina's drive, which I would like to do in the future, HS can't boot, and verbose mode does not give any useful info (at least I have not caught it) why it reboots.

I did a little digging, and figured that changing Devices/IntelGFX from 0x59168086 (which works with Catalina) to 0x0 (which worked before with HS) successfully boot HS with running GPU graphics, but then Catalina's UHD graphics does not work.

In all testing, when wanting to boot with (HS or Windows) GPU graphics, I connect monitor to GPU with DP, and when wanting using UHD graphics (Catalina), I connect monitor to motherboard's DP.

Do you maybe know if it is possible to use the same clover configuration with both HS with GPU graphics and Catalina with UHD 630 graphics (Windows works in all cases :D)?
Sorry, I have no idea - you might get a better answer if you post in the post installation / graphics forum:
 
Joined
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Messages
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Motherboard
Asus ROG Strix Z370-F Gaming
CPU
i7 8700K
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EVGA GeForce GTX 1080 TI SC2 Gaming ICX
I understand. Thank you!
 
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